Updated on 2024/12/12

写真a

 
SAKAMOTO Makoto
 
Organization
Director's Room Director
Title
Director
External link

Degree

  • Ph.D. ( 1989.3   Niigata University )

  • Master of Engineering ( 1985.3   Niigata University )

Research Interests

  • Mechanical Engineering

  • Contact

  • 材料力学

  • Dentistry

  • Bone

  • Joint

  • バイオメカニクス

  • Tooth

  • articular cartilage

  • Tendon

  • Ligament

  • MRI

  • CT

  • Ultrasonic

  • Elasticity

  • Cone-beam CT

  • micro-CT

  • nanoindentation

  • Solid mechanics

  • 破壊力学

  • 生体工学

  • 整形外科

  • 粘弾性

Research Areas

  • Life Science / Biomaterials  / バイオメカニクス

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Mechanics of materials and materials  / 弾性論

Research History (researchmap)

  • 新潟大学 理事 (教育・高大接続担当)・ 副学長

    2024.2

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  • 新潟大学 理事 (教育・国際連携担当)・ 副学長

    2022.2 - 2024.1

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  • Executive Vice President for Admission & International Affairs, Niigata University

    2020.2 - 2022.1

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  • Dean of Graduate School of Health Sciences, Niigat University

    2019.4 - 2020.1

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  • Vice-President for Admission & Public Relations of Niigata University

    2016.1 - 2020.1

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  • Niigata University   Graduate School of Health Sciences Health Sciences   Professor

    2004.4

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  • Niigata University   Faculty of Medicine School of Health Sciences   Professor

    2000.4

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  • Visiting Scientist, Johns Hopkins University School of Medicine   Orthopaedic Biomechanics Lab   Researcher

    1993.5 - 1994.2

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  • Niigata College of Technology   Associate Professor

    1990.4 - 2000.3

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  • Niigata College of Technology   Lecturer

    1989.4 - 1990.3

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  • 新潟鐵工所   機械事業部

    1985.4 - 1988.11

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Education

  • Niigata University   PhD course   Mechanical Engineering

    1986.4 - 1989.3

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  • Graduate School of Engineering, Niigata University   Master course   Mechanical Engineering

    1983.4 - 1985.3

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  • Niigata University   Faculty of Engineering   Mechanical Engineering

    1979.4 - 1983.3

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    Country: Japan

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Professional Memberships

  • JAPANESE SOCIETY FOR MEDICAL AND BIOLOGICAL ENGINEERING

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  • JAPANESE SOCIETY FOR CLINICAL BIOMECHANICS

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  • The Japanese Society for Experimental Mechanics

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  • THE JAPANESE SOCIETY FOR NON-DESTRUCTIVE INSPECTION

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  • THE SOCIETY OF MATERIALS SCIENCE, JAPAN

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  • JAPANESE SOCIETY FOR BONE MORPHOMETRY

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  • JAPANESE SOCIETY OF RADIOLOGICAL TECHNOLOGY

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  • 日本側弯症学会

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  • THE JAPAN SOCIETY OF MECHANICAL ENGINEERS

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  • 日本骨粗鬆症学会

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Committee Memberships

  • 日本臨床バイオメカニクス学会   理事  

    2024.11   

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    Committee type:Academic society

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  • 第61回日本生体医工学会   大会長  

    2022.6   

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  • ATEM'19 International Conference on Advanced Technology in Experimental Mechanics   国際会議大会長  

    2019.10   

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    Committee type:Academic society

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  • 東北次世代がんプロ養成機関   東北がん評議会 評議員  

    2019.5 - 2020.3   

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    Committee type:Other

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  • 日本非破壊検査協会   編集員  

    2018.4   

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    Committee type:Academic society

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  • Asian Society of Experimental Mechanics,   Steering Committee Member  

    2018   

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    Committee type:Academic society

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  • 日本学術振興会   科学研究費 審査第五部会委員  

    2018 - 2019   

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  • 日本機械学会   材料力学部門・国際交流委員長  

    2017.4 - 2020.3   

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    Committee type:Academic society

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  • 新潟県   教育振興基本計画改定外部有識者委員  

    2017 - 2019   

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    Committee type:Municipal

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  • 日本学術振興会   科学研究費助成事業 奨励研究部会理工系小委員会審査委員  

    2017   

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    Committee type:Academic society

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  • 日本機械学会   JBSE編集委員  

    2016.4 - 2022.3   

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    Committee type:Academic society

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  • 日本機械学会 第27回バイオエンジニアリング講演会   大会長  

    2015.1   

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  • 日本実験力学会   会長  

    2013.8 - 2014.8   

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    Committee type:Academic society

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  • 日本非破壊検査協会   応力・ひずみ測定部門主査  

    2012.4 - 2013.3   

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    Committee type:Academic society

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  • 日本生体医工学会   バイオメカニクス研究会委員長  

    2011.4   

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    Committee type:Academic society

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  • International Symposium on Advanced Science and Technology in Experimental Mechanics   Organizing Committee  

    2011   

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    Committee type:Academic society

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  • The 4th International Symposium on Advanced Fluid/Solid Science and Technology in Experimental Mechanics   国際会議大会長  

    2009.11   

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    Committee type:Academic society

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  • 日本機械学会   バイオエンジニアリング部門広報委員長  

    2008.4 - 2010.3   

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    Committee type:Academic society

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  • Bio-Medical Materials and Engineering   Editorial Advisory Board  

    2008   

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    Committee type:Academic society

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  • 日本実験力学会   評議員  

    2003.5 - 2012.8   

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    Committee type:Academic society

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  • 日本機械学会   バイオエンジニアリング部門運営委員  

    2003.4 - 2010.3   

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  • 日本生体医工学会   甲信越支部新潟地区評議委員  

    1999.4   

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  • 日本臨床バイオメカニクス学会   評議員,編集委員  

    1996.4   

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    Committee type:Academic society

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Qualification acquired

  • 日本機械学会フェロー

  • Specialist in Experimental Mechanics

 

Papers

  • ストレイン超音波エラストグラフィを用いた肘関節角度変化および外反負荷に伴う前斜走靱帯の生体内剛性測定 Reviewed

    坂本信, 菅原拓也, 伊藤慶, 小林公一, 平元和彦

    臨床バイオメカニクス   45   121 - 129   2024.10

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

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  • コーンビームCTを用いた上下顎の三次元咬合平面 Reviewed

    石井義人, 長江恒樹, 坂本信, 亀田剛, 小林公一, 坂井幸子, 遠藤英昭, 平元和彦

    臨床バイオメカニクス   45   227 - 235   2024.10

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

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  • 大腿骨滑車形状の三次元定量評価に関する研究 Reviewed

    鈴木宏基, 小林公一, 望月友晴, 坂本信

    臨床バイオメカニクス   45   81 - 87   2024.10

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    Authorship:Last author   Language:Japanese   Publishing type:Research paper (scientific journal)  

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  • Assessment of spinal alignment in standing position using Biplanar X-ray images and three-dimensional vertebral models Reviewed

    Koichi Kobayashi, Makoto Sakamoto, Keisuke Sasagawa, Masaaki Nakai, Masashi Okamoto, Kazuhiro Hasegawa, Kengo Narita

    Porto Biomedical Journal   9 ( 3 )   2024.5

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    Publishing type:Research paper (scientific journal)   Publisher:Ovid Technologies (Wolters Kluwer Health)  

    Abstract

    We developed two methods for three-dimensional (3D) evaluation of spinal alignment in standing position by image matching between biplanar x-ray images and 3D vertebral models. One used a Slot-Scanning 3D x-ray Imager (sterEOS) to obtain biplanar x-ray images, and the other used a conventional x-ray system and a rotating table. The 3D vertebral model was constructed from the CT scan data. The spatial position of the vertebral model was determined by minimizing the contour difference between the projected image of the model and the biplanar x-ray images. Verification experiments were conducted using a torso phantom. The relative positions of the upper vertebrae to the lowest vertebrae of the cervical, thoracic, and lumbar vertebrae were evaluated. The mean, standard deviation, and mean square error of the relative position were less than 1° and 1 mm in all cases for sterEOS. The maximum mean squared errors of the conventional x-ray system and the rotating table were 0.7° and 0.4 mm for the cervical spine, 1.0° and 1.2 mm for the thoracic spine, and 1.1° and 1.2 mm for the lumbar spine. Therefore, both methods could be useful for evaluating the spinal alignment in standing position.

    DOI: 10.1097/j.pbj.0000000000000256

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  • Three-dimensional positions of the center of resistance of the maxillary canine distal movement under orthodontic force loading Reviewed

    Kazuto TERADA, Takashi KAMEDA, Makoto SAKAMOTO

    Dental Materials Journal   43 ( 1 )   44 - 51   2024.1

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society for Dental Materials and Devices  

    DOI: 10.4012/dmj.2023-160

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  • 人工膝関節の大腿骨・脛骨コンポーネント間の接触および相対的滑り挙動の評価, Reviewed

    小林 公一, 坂本 信, 田邊 裕治, 佐藤 卓, 渡邉 聡, 大森 豪, 古賀 良生

    実験力学   23 ( 4 )   290 - 295   2023.12

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  • CBCTを用いた上下顎間の三次元歯列形態の関係性の評価 Reviewed

    石井義人, 坂本信, 亀田剛, 坂上勇太, 森清友亮, 小林公一, 坂井幸子, 遠藤英昭, 平元和彦

    臨床バイオメカニクス   44   319 - 328   2023.10

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  • 回旋トルク負荷時における前十字靭帯不全膝の回旋挙動 Reviewed

    高橋雄也, 小林公一, 渡邉聡, 坂本信

    臨床バイオメカニクス   44   69 - 74   2023.10

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  • 変形性膝関節症進行と下肢アライメント, 皮質骨幅変化との関連 Reviewed

    森清友亮, 坂上勇太, 高根沢佑斗, 田邊裕治, 坂本信, 小林公一, 望月友晴, 古賀良生

    臨床バイオメカニクス   44   97 - 103   2023.10

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  • DRR画像を用いた二次元画像上の大腿骨 - 脛骨間の側方移動指標の精度検証 Reviewed

    森隆裕, 田中正栄, 渡邉博史, 森清友亮, 望月友晴, 古賀寛, 小林公一, 大森豪, 坂本信, 田邊裕治, 古賀良生

    臨床バイオメカニクス   44   87 - 91   2023.10

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  • Three-dimensional location and distribution of the center of resistance in the maxillary first molar applied to occlusal force Reviewed

    Kazuto TERADA, Takashi KAMEDA, Makoto SAKAMOTO

    Dental Materials Journal   42 ( 1 )   133 - 139   2023.1

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    Authorship:Last author   Publishing type:Research paper (scientific journal)   Publisher:Japanese Society for Dental Materials and Devices  

    DOI: 10.4012/dmj.2022-136

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  • Anisotropy and strain rate dependent behaviour in mechanical properties of porcine vertebral trabecular bone Reviewed

    56 ( 2 )   23 - 31   2023.1

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  • Visual evaluation for the elasticity of suprahyoid muscles using sonographic elastography during tongue pressure measurement: A pilot study. Reviewed International journal

    Sachiko Hayashi-Sakai, Taichi Kobayashi, Takafumi Hayashi, Junko Shimomura-Kuroki, Jun Sakai, Makoto Sakamoto

    Bio-medical materials and engineering   34 ( 2 )   159 - 168   2023

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

    BACKGROUND: Suprahyoid muscles behavior during the tongue lifting movement has not yet been elucidated. OBJECTIVE: The purpose of this study was to investigate the potential of elastography imaging to examine developmental oral dysfunction in children and oral hypofunction in older adults using sonography. METHODS: Tongue pressure was measured using a manometer with a probe. The tongue pressure was measured with simultaneously scanning the geniohyoid muscle (GHM) and the anterior belly of the digastric muscle (DGM) using sonographic elastography. Sagittal images of the GHM and coronal images of the DGM were used for the strain ratio measurement. The strain ratio of the muscles was measured three times for each subject with the tongue pressure values of 0-30 kPa. RESULTS: The strain ratio of the GHM were higher than those of the DGM at tongue pressure of 10, 20 and 30 kPa. The strain ratio of the GHM increased as the tongue pressure increased in all participants. In contrast, the strain ratio of the DGM tended to slowly decrease as tongue pressure increased in female participants. CONCLUSION: Sonographic elastography is useful for visual and quantitative evaluation of elastic properties in suprahyoid muscles during tongue lifting movements.

    DOI: 10.3233/BME-221414

    PubMed

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  • Characteristics of three-dimensional teeth angle of the maxillary and mandibular teeth using cone-beam CT Reviewed

    43   339 - 344   2022.10

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    Authorship:Corresponding author   Language:Japanese  

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  • Evaluation of kinematics of the knee before and after ACL injury Reviewed

    Japanese Journal of Clinical Biomechanics   43   83 - 89   2022.10

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  • Relation of progression of the knee osteoarthritis and quantitative angularparameters of radiographic evaluation — Longitudinal epidemiological study of the Matsudai Knee Osteoarthritis Survey— Reviewed

    Japanese Journal of Clinical Biomechanics   43   239 - 245   2022.10

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    Language:Japanese  

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  • A semi-automated technique for estimating the proximal articular surface of tibia Reviewed

    Japanese Journal of Clinical Biomechanics   43   233 - 237   2022.10

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  • Accuracy verification of cortical bone thickness in terms of anteroposterior knee X-ray image Reviewed

    Japanese Journal of Clinical Biomechanics   43   253 - 257   2022.10

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  • コーンビームCTを用いた上下顎歯の三次元歯軸角度の特徴

    石井 義人, 坂本 信, 坂上 勇太, 亀田 剛, 森清 友亮, 小林 公一, 坂井 幸子, 遠藤 英昭, 平元 和彦

    臨床バイオメカニクス   43   339 - 344   2022.10

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    Authorship:Corresponding author   Language:Japanese   Publisher:(一社)日本臨床バイオメカニクス学会  

    正常咬合者13名の上下顎骨を撮影したコーンビームCT画像の三次元骨モデルの3点の特徴点から口腔内に三次元ワールド座標系を設定し,横断面,冠状面および矢状面を定めた.そして,歯形状より主成分分析法によって三次元歯軸を求めた.歯軸を3平面上に投影して,各平面内での上下顎全歯の対向する同名歯種の歯軸のなす角度である交角度を求めた.さらに,異なる歯種間の交角度の関係について示した.その結果,投影した平均交角度は3平面内においていずれも正中面に対してほぼ左右対称の傾向を示した.横断面および矢状面内の交角度は前歯では小さく,第二小臼歯,第一大臼歯,第二大臼歯では,他歯種と比べて交角度は大きい.一方,異なる歯種間の交角度の相関は,横断面内の中切歯,側切歯,犬歯では隣接する歯種間に有意な正の相関が認められた.矢状面内では,第二大臼歯以外は多くの歯種間で交角度の相関がみられることを明らかにした.(著者抄録)

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  • Assessment of knee collateral ligament stiffness by strain ultrasound elastography. Reviewed International journal

    Surangika Wadugodapitiya, Makoto Sakamoto, Masaei Tanaka, Yuta Sakagami, Yusuke Morise, Koichi Kobayashi

    Bio-medical materials and engineering   33 ( 5 )   337 - 349   2022.9

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    BACKGROUND: Knowledge of the biomechanics of the normal collateral ligaments is important to secure optimal stability of the knee following injury. Various in vitro methods have been described in evaluating the biomechanics of these ligaments. However, a method of direct evaluation has not been reported. OBJECTIVE: To determine the stiffness characteristics of the collateral ligaments of the knee using strain ultrasound elastography. METHODS: Strain ultrasound elastography was performed on different components of the collateral ligaments in various angles of knee flexion in 18 healthy males (36 ligaments). We measured relative stiffness of the ligaments using strain ratio (SR = target tissue strain/reference strain). A lower strain ratio indicates higher relative stiffness. RESULTS: There was moderate to excellent intra- and inter-rater agreement for strain ratio measurements in all ligament portions. Strain ratios were lowest at 0° in all three ligaments, indicating high relative stiffness. In the superficial and deep medial collateral ligaments, the strain ratio increased with increasing knee flexion, whereas in the lateral collateral ligament, stiffness showed a tendency to fluctuate. CONCLUSION: Strain ultrasound elastography is a reliable tool for monitoring relative stiffness of the collateral ligaments of the knee and is easily applied to the routine clinical setting.

    DOI: 10.3233/BME-211282

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  • Experimental determination of static and dynamic Young’s moduli of healthy and degenerated bovine articular cartilage using the split-Hopkinson pressure bar Reviewed

    Takahiro MORI, Hiroto SAKURAI, Koichi KOBAYASHI, Makoto SAKAMOTO, Yuji TANABE

    Mechanical Engineering Journal   9 ( 2 )   21 - 00400   2022.2

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    Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Mechanical Engineers  

    DOI: 10.1299/mej.21-00400

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  • Can hypochlorous acid be a powerful sanitizer to replace alcohol for disinfection ? —Its bactericidal, degradation of the solutions under various storage condition, and steel rust effects Reviewed

    Takashi KAMEDA, Shunya OKA, Jun-ichi IGAWA, Makoto SAKAMOTO, Kazuto TERADA

    Dental Materials Journal   41 ( 1 )   167 - 183   2022.1

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    Publishing type:Research paper (scientific journal)   Publisher:Japanese Society for Dental Materials and Devices  

    DOI: 10.4012/dmj.2021-146

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  • An analysis of three-dimensional tooth axis using cone-beam computed tomography Reviewed

    Japanese Journal of Clinical Biomechanics   42   79 - 85   2021.10

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

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  • 荷重-非荷重における大腿骨脛骨間の相対位置変化解析 Reviewed

    森清友亮, 森隆裕, 古賀良生, 望月友晴, 大森豪, 小林公一, 坂本信, 田邊裕治

    臨床バイオメカニクス   42   63 - 66   2021.10

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  • ACL損傷前後における付着部間距離の変化 Reviewed

    佐藤直樹, 小林公一, 渡邉聡, 大森豪, 坂本信, 古賀良生, 田邊裕治

    臨床バイオメカニクス   42   269 - 274   2021.10

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  • 膝前後単純X画像における変形性膝関節症進行度の定量的評価システムの開発と信頼性の検討 Reviewed

    森 隆裕, 坂上 勇太, 望月 友晴, 古賀 良生, 森清 友亮, 古賀 寛, 大森 豪, 小林 公一, 坂本 信, 田邊 裕治

    臨床バイオメカニクス   42   39 - 43   2021.10

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    Language:Japanese   Publisher:日本臨床バイオメカニクス学会  

    大規模集団検診(松代膝検診)で確認した変形性膝関節症(膝OA)進行に伴う膝前後単純X線画像上の下腿骨位置や形状の定量的評価で膝OA進行度判定が可能と考え、半自動評価システムを開発した。松代膝検診第5回(2007年)から12年間の5回をすべて受診した対象のうち、任意で抽出した男女各10名の単純X線画像を対象に測定の信頼性を評価および従来の手動デジタイズ法との測定精度と測定時間を比較検討した。測定の信頼性として検者内では級内相関係数:ICC=0.98、検者間ではICC=0.96、従来法との比較でもICC=0.96と高い信頼性を示した。また、評価指標で、脛骨関節面傾斜、関節裂隙幅比の減少、脛骨内側皮質骨幅比の増加、FTAの増加など過去に報告した膝OA進行に伴う変化が算出された。特に、骨の参照軸の自動抽出により測定値の安定とこれによる測定時間が約1/3に短縮した。(著者抄録)

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  • コーンビームCTによる三次元歯軸の解析 Reviewed

    坂上 勇太, 坂本 信, 森清 友亮, 亀田 剛, 小林 公一, 坂井 幸子, 遠藤 英昭, 田邊 裕治

    臨床バイオメカニクス   42   79 - 85   2021.10

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    Authorship:Corresponding author   Language:Japanese   Publisher:日本臨床バイオメカニクス学会  

    本研究では、成人10名の上下顎骨を撮影したコーンビームCT画像から骨モデルを三次元再構成し、解剖学的特徴箇所である下顎両側オトガイ孔2点および上顎切歯管1点を利用して口腔内に三次元ワールド座標系を構築し、全ての歯の三次元モデルを作成した。各歯の幾何学的重心(COG)と主成分分析法で計算した歯軸(PC-A)を求め、空間内のCOGとPC-Aを横断面、冠状面および矢状面上に投影して、各平面内でのPC-A角度とCOGによる歯列を示した。その結果、冠状面では、上顎歯は全て頬側に歯が傾き、下顎歯は、中切歯、側切歯、犬歯、第一小臼歯は頬側に向いているが、第二小臼歯、第一、第二大臼歯は舌側を向く。矢状面では、上顎歯は第二大臼歯だけが遠心側に傾いているのに対し、下顎歯は全て近心側に傾くという一般的な正常咬合者の特徴を定量的に明らかにした。さらに、3平面内におけるCOG位置とPC-A角度との関係を表す回帰曲線は、簡潔な多項式で表現できることを示した。(著者抄録)

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  • In vivo stiffness assessment of patellar and quadriceps tendons by strain ultrasound elastography Reviewed International journal

    Surangika Wadugodapitiya, Makoto Sakamoto, Sayaka Suzuki, Yusuke Morise, Koichi Kobayashi

    Bio-Medical Materials and Engineering   32 ( 5 )   1 - 10   2021.5

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    BACKGROUND: The patellar and quadriceps tendons are responsible for the extension mechanism of the knee joint and frequently become inflamed during sports. Diagnosis and determination of when an athlete can return to sports following these injuries are usually performed by assessing morphological features and functional outcomes. Nevertheless, mechanical properties are not being assessed. OBJECTIVE: To describe the stiffness characteristics of these two tendons over the range of knee flexion and to test the feasibility of using strain ultrasound elastography (SE). METHODS: SE with an acoustic coupler as the reference was performed for nine healthy males. Relative stiffness measurements were obtained using the strain ratio (SR = target tissue strain/reference strain) by placing the knee in five different flexion angles. Lower SR indicates higher relative stiffness. RESULTS: This study showed reliable measurement with good intra- and inter-rater agreement for SR at 30°. SR of the quadriceps tendon decreases as knee flexion increases, indicating increased relative stiffness. In the patellar tendon, no significant difference was observed between 30° and 60°. Beyond 60°, relative stiffness increased constantly. CONCLUSIONS: SE is a reproducible and feasible tool to monitor relative stiffness of the patellar and quadriceps tendons in routine clinical settings.

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  • Indentation method accounting for thickness effect of viscoelastic layer Reviewed

    Kotaro Miura, Chihiro Oyama, Makoto Sakamoto, Yuji Tanabe

    ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik   2021.5

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    Indentation tests have been widely used to evaluate the mechanical properties of industrial and biological materials in many studies. In this study, we obtained an analytical solution for the axisymmetric contact problem for a viscoelastic layer bonded to a rigid substrate and indented by a flat‐ended cylindrical punch using the elastic–viscoelastic correspondence principle. The analytical solution was obtained from a method using an infinite system of simultaneous equations instead of a conventional method using the second kind of Fredholm equation. Relaxation indentation tests were conducted for silicon rubber, polyurethane gel (a soft material used for elastography), and articular cartilage from a bovine femoral head. The articular cartilage was tested as obtained and then tested again after treatment by collagenase. The viscoelastic models in this study were a three‐element model (standard linear solid model) and a five‐element model (generalized Maxwell model), and the viscoelastic parameters for the models were determined by fitting the analytical solution to results for applied load as it varied over time during relaxation indentation tests. The results suggested that the five‐element model was more appropriate than the three‐element model for reproducing the relaxation indentation behavior of silicon rubber, polyurethane gel, and articular cartilage. Furthermore, the viscoelastic parameters for treated articular cartilage clearly decreased compared with those for unaltered articular cartilage. These results suggest that the method for evaluating the time‐dependent mechanical properties of articular cartilage based on analytical solutions of relaxation indentation tests could be a useful tool for evaluating the state of degenerated cartilage.

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  • Influence of lumbosacral transitional vertebrae on spinopelvic parameters using biplanar slot scanning full body stereoradiography―analysis of 291 healthy volunteers Reviewed

    Masashi Okamoto, Kazuhiro Hasegawa, Shun Hatsushikano, Koichi Kobayashi, Makoto Sakamoto, Masayuki Ohashi, Kei Watanabe

    Journal of Orthopaedic Science   2021.5

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    BACKGROUND: Proper identification of lumbosacral transitional vertebrae (LSTV) is important to characterize the relationship between the transitional segment and adjacent levels. Classical classification schemes are inaccurate with respect to the whole spine. We propose a precise vertebral numbering method and investigated the relationship between LSTV and whole-body sagittal alignment. METHODS: A total of 291 healthy adult volunteers with no history of spinal disease were evaluated with biplanar slot scanning full body stereoradiography to determine the prevalence of LSTV. Vertebrae were counted from the first cervical vertebra using both coronal and sagittal plane images. We then investigated the influence of LSTV on whole-body sagittal alignment in 279 participants. Whole-body key parameters descriptive statistics were compared among groups according to the number of vertebrae (L4, L5, and L6). Statistical analysis was performed between normal and LSTV cases using the Steel-Dwass analysis. RESULTS: Of the 291 subjects, 14 (4.8%) had 23 vertebrae and 16 (5.5%) had 25 vertebrae. Eleven (3.8%) had Th11, 3 (1.0%) had L4, and 1 (0.3%) had Th11 + L6, 16 (5.5%) had L6. Compared with the normal group, the sacral base in relation to the pelvis was higher in the L4 group and lower in the L6 group. The C2-C7 angle and lumbar lordosis (LL) were increased in both the L4 and L6 groups. All remaining parameters were decreased in the L4 group and increased in the L6 group. The relationship between LL and PI was similar in the normal and LSTV groups, despite the difference in the sacral base location. CONCLUSIONS: We propose a precise method for numbering the vertebrae using coronal and sagittal full body images. The spinopelvic parameters of the LSTV population significantly differed from those in the normal spine population due to differences in the sacral base location.

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  • Analytical solution for the axisymmetric problem of a penny-shaped crack under internal pressure in a multi-layer composite Reviewed

    Kotaro MIURA, Makoto SAKAMOTO, Yuji TANABE

    Mechanical Engineering Journal   8 ( 2 )   21 - 00025   2021.4

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    <p>The axisymmetric problem of a multi-layer composite with a penny-shaped crack, which is parallel to the interface between elastic layers, in the center plane is considered. It is assumed that each elastic layer, which has a unique elastic constant, is perfectly bonded to its adjacent elastic layers. The multi-layer composite is subjected to uniform internal pressure on the crack surface. The dual integral equations obtained for the problem are reduced to an infinite system of simultaneous equations by expressing the normal displacements on the crack surface as an appropriate series function. The boundary conditions between adjacent elastic layers can be generally formulated using the transfer matrix method. Numerical results were obtained in hard- and soft-layer composite systems, for which the elastic properties of each layer linearly increase and decrease towards the crack plane, respectively. This study shows not only the results of the mode I stress intensity factor at the crack tip, but also the distribution of normal stress and displacement at the crack plane. Furthermore, sandwich structures composed of three materials with different mechanical properties were considered. Numerical calculations show several conclusions that a stiffer layer should be placed father away from the crack surface to decease the stress intensity factor and the hardness of the middle layer contributes to the stress intensity factor for the sandwich structures.</p>

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  • Semi-powered exoskeleton that regulates the muscular activity of jaw movement for oral functional rehabilitation/training. Reviewed

    Takashi Kameda, Makoto Sakamoto, Kazuto Terada

    Dental materials journal   40 ( 1 )   101 - 109   2021.1

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    The sequential oral functions of mastication and swallowing are well tuned in humans. To prevent oral hypofunction as a risk factor for systemic frailty by oral motor training, semi-powered exoskeleton was developed and evaluated its loading/assist effects by monitoring electromyography signals and saliva secretion in healthy persons. The actuator of the driving unit combined mechanical and powered mechanics and was driven alternatively by an unpowered stainless-steel spring system for jaw-opening training by loading and a powered shape-memory alloy spring system to assist jaw closing. Sequential device movement was controlled by two electronic circuits with two magnetic switching systems to match human jaw movement. This exoskeleton realized a 25% increase of jaw-opening muscular activity for training, 15% saving of jaw-closing muscular activity for assistance, and 15% enhancement of saliva secretion, which could contribute to the prevention of oral frailty by maintenance and strengthening of oral function in the upcoming super-aging society.

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  • New evaluation indices for rotational knee angles in standing anteroposterior knee radiographs. Reviewed International journal

    Takahiro Mori, Tomoharu Mochizuki, Yoshio Koga, Hiroshi Koga, Koichi Kobayashi, Ryota Katsumi, Makoto Sakamoto, Go Omori, Yuji Tanabe

    Bio-medical materials and engineering   32 ( 2 )   85 - 99   2020.12

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    BACKGROUND: Identifying the time course of rotational knee alignment is crucial for elucidating the etiology in knee osteoarthritis. OBJECTIVE: The aim of this study was to propose new rotational indices for calculating the change in relative rotational angles between the femur and tibia in standing anteroposterior (AP) radiographs. METHODS: Forty healthy elderly volunteers (20 women and 20 men; mean age, 70 ± 6 years) were assessed. The evaluation parameters were as follows: (1) femoral rotational index: the distance between the sphere center of the medial posterior femoral condyle and the lateral edge of the patella, and (2) tibial rotational index: the distance between the medial eminence of the tibia and the lateral edge of the fibula head. The indices were standardized by the diameter of the sphere of the medial posterior femoral condyle. This study (1) identified the relationship between changes in rotational indices and the simulated rotational knee angles in the standing position, (2) proposed a regression equation for the change in relative rotational angles between the femur and tibia in standing AP radiographs, and (3) verified the accuracy of the regression equation. RESULTS: The rotational indices increased in direct proportion to simulated rotational knee angles (femoral index: r > 0.9,p < 0.0001; tibial index: r > 0.9, p < 0.0001). Based on the results, the regression equation with the accuracy of 0.45 ± 0.26° was determined. CONCLUSIONS: The proposed regression equations can potentially predict the change in relative rotational angles between the femur and tibia in a pair of standing AP radiographs taken at different dates in longitudinal studies.

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  • Quantitative evaluation of elasticity of lower orbicularis oris muscle during the lip closing measurement using sonographic elastography. Reviewed International journal

    Sachiko Hayashi-Sakai, Taichi Kobayashi, Makoto Sakamoto, Takafumi Hayashi, Yusuke Morise, Yutaka Nikkuni, Masaki Takamura, Jun Sakai, Junko Shimomura-Kuroki, Makiko Ike, Hideyoshi Nishiyama

    Bio-medical materials and engineering   31 ( 6 )   361 - 371   2020.11

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    BACKGROUND: Lip closing functions have never been evaluated from the viewpoint of elastic properties. OBJECTIVES: The purpose of the present study was to investigate the behavior of the lower orbicularis oris muscle during a button-pull exercise to measure lip closing force and quantitatively evaluate its elastic properties using sonographic elastography. METHODS: Appropriate compression loads for elastography were randomly measured on one of three types of acoustic couplers on three examiners. Compression tests were performed on three types of acoustic couplers within the appropriate compression load. Using the acoustic coupler with the lowest elastic modulus, the strain ratio of the lower orbicularis oris muscle during lip closing was measured, and elastography was performed on six males under tension loads of 0-8 N. RESULTS: The intraclass correlation coefficient (1, 3) for the tension load of 0 N was 0.81. Elastography showed that the strain ratio values increased significantly (p < 0.05) as the tension load increased. CONCLUSIONS: Combining the data obtained from lip closing test devices and sonographic elastography enabled the muscle performance to be evaluated objectively and accurately.

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  • Cortical thickness of the tibial diaphysis reveals age- and sex-related characteristics between non-obese healthy young and elderly subjects depending on the tibial regions. Reviewed International journal

    Keisuke Maeda, Tomoharu Mochizuki, Koichi Kobayashi, Osamu Tanifuji, Keiichiro Someya, Sho Hokari, Ryota Katsumi, Yusuke Morise, Hiroshi Koga, Makoto Sakamoto, Yoshio Koga, Hiroyuki Kawashima

    Journal of experimental orthopaedics   7 ( 1 )   78 - 78   2020.10

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    PURPOSE: This study aimed to evaluate the age- and sex-related characteristics in cortical thickness of the tibial diaphysis between non-obese healthy young and elderly subjects as reference data. METHODS: The study investigated 31 young subjects (12 men and 19 women; mean age, 25 ± 8 years) and 54 elderly subjects (29 men and 25 women; mean age, 70 ± 6 years). Three-dimensional estimated cortical thickness of the tibial diaphysis was automatically calculated for 5000-9000 measurement points using the high-resolution cortical thickness measurement from clinical computed tomography data. In 12 assessment regions created by combining three heights (proximal, central, and distal diaphysis) and four areas of the axial plane at 90° (medial, anterior, lateral, and posterior areas) in the tibial coordinate system, the standardized thickness was assessed using the tibial length. RESULTS: As structural characteristics, there were no differences in the medial and lateral thicknesses, while the anterior thickness was greater than the posterior thickness in all groups. The sex-related difference was not shown. As an age-related difference, elderly subjects showed greater or lesser cortical thickness than the young subjects, depending on the regions of the tibia. CONCLUSIONS: Cortical thickness was different depending on sex, age, and regions in the tibia. The results of this study are of clinical relevance as reference points to clarify the causes of various pathological conditions for diseases. LEVEL OF EVIDENCE: Level 3.

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  • A mathematical analysis of three-dimensional dental alignment and tooth axis in normal occlusion Reviewed

    41   385 - 392   2020.10

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  • Assessment of orientations of mechanical axis and grand reaction force in cases of showing windswept deformity of knee Reviewed

    41   109 - 113   2020.10

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  • Evaluation of lower extremity alignment and its relation to the stiffness of gluteus fascia assessed by elasto-gram : In case of windswept knee deformity Reviewed

    41   115 - 119   2020.10

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  • Finite element analysis of proximal tibia under axial loadings for early knee osteoarthritis Reviewed

    41   127 - 131   2020.10

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  • Analytical solution of axisymmetric indentation of multi-layer coating on elastic substrate body Reviewed

    Kotaro Miura, Makoto Sakamoto, Yuji Tanabe

    Acta Mechanica   231 ( 7 )   2020.7

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  • Age- and sex-related characteristics in cortical thickness of femoral diaphysis for young and elderly subjects. Reviewed

    Keiichiro Someya, Tomoharu Mochizuki, Sho Hokari, Osamu Tanifuji, Ryota Katsumi, Hiroshi Koga, Yuki Takahashi, Koichi Kobayashi, Yusuke Morise, Makoto Sakamoto, Yoshio Koga, Naoto Endo

    Journal of bone and mineral metabolism   38 ( 4 )   533 - 543   2020.1

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    INTRODUCTION: Cortical thickness of the femoral diaphysis is assumed to be a preferred parameter in the assessment of the structural adaptation by mechanical use and biological factors. This study aimed to investigate the age- and sex-specific characteristics in cortical thickness of the femoral diaphysis between young and elderly non-obese people. MATERIALS AND METHODS: This study investigated 34 young subjects (21 men and 13 women; mean age: 27 ± 8 years) and 52 elderly subjects (29 men and 23 women; mean age: 70 ± 6 years). Three-dimensional (3D) cortical thickness of the femoral diaphysis was automatically calculated for 5000-8000 measurement points using the high-resolution cortical thickness measurement from clinical CT data. In 12 assessment regions created by combining three heights (proximal, central, and distal diaphysis) and four areas of the axial plane at 90° (medial, anterior, lateral, and posterior areas) in the femoral coordinate system, the standardized thickness was assessed using the femoral length. RESULTS: As per the trends, (1) there were no differences in medial and lateral thicknesses, while the posterior thickness was greater than the anterior thickness, (2) the thickness in men was higher than that in women, and (3) the thickness in young subjects was higher than that in elderly subjects. CONCLUSIONS: The results of this study are of clinical relevance as reference points to clarify the causes of various pathological conditions for diseases of the lower extremities.

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  • Estimation of three-dimensional long axes of the maxillary and mandibular first molars with regression analysis Reviewed

    Kazuto Terada, Takashi Kameda, Ikuo Kageyama, Makoto Sakamoto

    Anatomical Science International   95 ( 1 )   126 - 133   2020.1

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    DOI: 10.1007/s12565-019-00506-1

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  • Evaluation of dynamic knee joint alignment using a one-way frontal video method Reviewed

    Kensaku KAWAKAMI, Takahiko NAKAMURA, Katsumi HAMA, Koichi KOBAYASHI, Makoto SAKAMOTO

    Journal of Biomechanical Science and Engineering   2020

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  • Three-dimensional In Vivo Analysis of the Trapeziometacarpal Joint Contact Behavior Using Magnetic Resonance Imaging Reviewed

    MORISE Yusuke, SAKAMOTO Makoto, SAKAGAMI Yuta, KAZAMA Kiyoko, KOBAYASHI Koichi, TANABE Yuji

    Journal of the Japanese Society for Experimental Mechanics   20 ( 1 )   39 - 44   2020

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    <p> Trapeziometacarpal joint (TMC joint) of thumb is one of the joints having a complicated shape which enables to generate a wide variation of finger movements in daily life. It is important to clarify the accurate in vivo contact behavior of healthy TMC joint when evaluating post-operative joint movements. Thus, author analyzed TMC joint contact behavior in 4 different finger positions of 8 healthy adult males using magnetic resonance imaging (MRI) system. From MR images, three-dimensional bone models were constructed and a three-dimensional coordinate system was defined by the characteristic shape of each bone model. Then, three bone axial angles and three-dimensional bone motion of each 4 positions in the TMC joint were calculated: abduction-adduction, extension-flexion, pronation-supination, and Euler angles. Furthermore, contact areas of the articular cartilage in each of 4 positions were clarified from MR images. Results have shown that, the contact area changed with changing of the thumb position and it was maximum oat the thumb extension. In addition, it was clarified that the contact area moved according to the thumb position.</p>

    DOI: 10.11395/jjsem.20.39

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  • 立位下肢アライメントと床反力測定による下肢機能軸と荷重方向の三次元評価法の提案 Reviewed

    藤原靖, 森清友亮, 中原大輔, 小林公一, 坂本信, 田邊裕治, PRAMUDITA Jonas, Aditya, 佐藤卓, 大森豪, 湊泉, 古賀良生

    臨床バイオメカニクス   40   121‐125   2019.10

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  • コーンビームCTを用いた新たな三次元歯列弓の定義 Reviewed

    坂上勇太, 坂本信, 森清友亮, 亀田剛, 小林公一, 坂井幸子, 遠藤英昭, 田邊裕治

    臨床バイオメカニクス   40   281‐288   2019.10

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  • 大腿脛骨関節における立位屈曲初期での相対運動と軟骨接触挙動評価 Reviewed

    中原大輔, 小林公一, 坂本信, 佐藤卓, 渡邉聡, 大森豪, 古賀良生, PRAMUDITA Jonas Aditya, 田邊裕治

    臨床バイオメカニクス   40   95‐100   2019.10

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  • Relative position of sacral base in the pelvis and its correlation with spino-pelvic parameters. Reviewed

    Okamoto M, Hasegawa K, Hatsushikano S, Watanabe K, Shimoda H, Kobayashi K, Sakamoto M

    European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society   29 ( 3 )   446 - 454   2019.8

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    DOI: 10.1007/s00586-019-06118-7

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  • A Dynamic Method of Measuring the Length of the Patellar Tendon Using Cine Magnetic Resonance Imaging Reviewed

    Tatsuya KONDO, Makoto SAKAMOTO, Koichi KOBAYASHI, Surangika, WADUGODAPITIYA

    Advanced Experimental Mechanics   4   157 - 162   2019.8

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  • In Vivo Stiffness Characteristics of the Medial Collateral Ligament with Varying Knee Flexion Angles Using Strain Ultrasound Elastography Reviewed

    Surangika WADUGODAPITIYA, Makoto SAKAMOTO, Masaei TANAKA, Yuta SAKAGAMI, Yusuke MORISE, Koichi KOBAYASHI

    Advanced Experimental Mechanics   4   147 - 152   2019.8

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  • MRIの3次元撮像法とCine法のイメージマッチングを用いた膝蓋腱の長さ変化測定

    近藤 達也, 坂本 信, 小林 公一, 金沢 勉, 斉藤 宏明

    日本放射線技術学会総会学術大会予稿集   75回   149 - 149   2019.3

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  • Ultrasound elastographic assessment of the stiffness of the anteromedial knee joint capsule at varying knee angles. Reviewed International journal

    Surangika Wadugodapitiya, Makoto Sakamoto, Kaito Sugita, Yusuke Morise, Masaei Tanaka, Koichi Kobayashi

    Bio-medical materials and engineering   30 ( 2 )   219 - 230   2019

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    BACKGROUND: In vivo evaluation of the elastic properties of the knee joint capsule has not been adequately performed. OBJECTIVES: To establish a methodology to assess the stiffness of the normal knee joint capsule over a range of knee flexion angles using ultrasound elastography. METHODS: Ultrasound elastography with an acoustic coupler was used to assess the stiffness of the anteromedial capsule of the knee joints of 10 male (mean age 22.63 ± 1.02 years) and 10 female (mean age 21.6 ± 0.8 years) subjects at static knee flexion angles of 0°, 45°, 90°, and 120°. Relative stiffness of the capsule was obtained using the strain ratio (SR), defined as the ratio of the strain in the capsule to that in the acoustic coupler. RESULTS: The intraclass correlation coefficient (1, 3) ranged from 0.95 to 0.96, and the correlation coefficient between examiners (2, 3) was 0.94. SR values decreased significantly as the flexion angle increased (P < 0.01). At 90° and 120°, it was significantly higher in female than in male subjects (P < 0.01). CONCLUSIONS: This study established a feasible and reproducible method to obtain the stiffness characteristics of the anteromedial knee joint capsule using ultrasound elastography with an acoustic coupler.

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  • In Vivo Strain Ultrasound Elastographic Assessment of the Stiffness of the Medial Collateral Ligament at Varying Knee Flexion Angles

    SAKAMOTO Makoto, WADUGODAPITIYAI Surangika, MORISE Yusuke, TANAKA Masaei, KOBAYASHI Koichi

    The Proceedings of Mechanical Engineering Congress, Japan   2019   J02513   2019

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  • The Effect of Elastic Properties on Indentation Test for Multi-layered Materials

    Miura Kotaro, Sakamoto Makoto, Tanabe Yuji

    The Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics   2019   1010B1100   2019

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  • 大腿脛骨軟骨間の接触動態と相対滑り量の検討 Reviewed

    中原大輔, 小林公一, 坂本信, 佐藤卓, 渡邉聡, 大森豪, 古賀良生, PRAMUDITA Jonas Aditya, 田邊裕治

    臨床バイオメカニクス   39   299 - 303   2018.10

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  • 二方向スロットラジオグラフィを用いた自動イメージマッチング法の開発 Reviewed

    岡庭大祐, 中原大輔, 小林公一, 坂本信, 田邊裕治, PRAMUDITA Jonas, Aditya, 佐藤卓, 大森豪, 湊泉, 古賀良生

    臨床バイオメカニクス   39   143‐148   2018.10

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  • Analytical solution of axisymmetric indentation of an elastic layer-substrate body Reviewed

    Kotaro MIURA, Makoto SAKAMOTO, Koichi KOBAYASHI, Jonas A, PRAMUDITA, Yuji TANABE

    Theretical and Applied Mechanics   67   81 - 101   2018.10

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    We focus on an elastic contact problem for indentation of a layer-substrate body. An elastic layer assumed to be perfectly bonded to an elastic semi-infinite substrate. The elastic layer is smoothly indented with a flat-ended cylindrical indenter and a spherical indenter. The analytical and exact solutions are obtained by solving an infinite system of simultaneous equations using the method to express a normal contact stress at the upper surface of the elastic layer as an appropriate series. This paper presents not only the axial load but also the distribution of the dimensionless normal contact stress under cylindrical and spherical indentation, the distribution of the dimensionless normal displacement at the upper surface of the elastic layer and the stress singularity factor. Numerical results are given for several combinations of the ratio of shear modulus and Poisson&rsquo;s ratios of the elastic layer and substrate, and the thickness of the elastic layer.

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  • 核磁気共鳴画像法を用いた母指指節間関節および中手指節関節の三次元生体内接触運動解析 Reviewed

    杉田魁人, 坂本信, 森清友亮, 風間清子, 小林公一, 田邊裕治

    臨床バイオメカニクス   39   237‐246   2018.10

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  • コーンビームCTによる前歯部の三次元自動歯軸および歯列決定法 Reviewed

    坂本信, 坂上勇太, 森清友亮, 亀田剛, 小林公一, 坂井幸子, 遠藤英昭

    臨床バイオメカニクス   39   207‐216   2018.10

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  • Analysis of in vivo static contact surface motion of thumb interphalangeal joint Reviewed

    Yusuke MORISE, Makoto SAKAMOTO, Kaito SUGITA, Kiyoko KAZAMA, Koichi KOBAYASHI, Yuji TANABE

    Advenced Experimental Mechanics   3   209 - 214   2018.8

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  • 新潟大学における入試広報アンケートの分析 Reviewed

    吉田 章人, 並川 努, 坂本 信

    大学入試研究ジャーナル   ( 28 )   127 - 132   2018.3

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  • Evaluation of permanent and primary enamel and dentin mineral density using micro-computed tomography Reviewed

    Sachiko Hayashi-Sakai, Makoto Sakamoto, Takafumi Hayashi, Tatsuya Kondo, Kaito Sugita, Jun Sakai, Junko Shimomura-Kuroki, Makiko Ike, Yutaka Nikkuni, Hideyoshi Nishiyama

    Oral Radiology   35 ( 1 )   1 - 6   2018.1

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    Objectives: The present study was performed to investigate the mineral density distribution in enamel and dentin for both permanent and primary teeth and to establish the standard density per tooth type using micro-computed tomography (CT). Methods: Fifty-seven extracted human teeth (37 permanent, 20 primary) were evaluated in the present study. The enamel and dentin mineral densities in the extracted teeth were measured using micro-CT. Cubic regression curves were used to determine the mineral density distribution in the enamel and dentin for each tooth type. Results: The mean values, distributions, and regression equations of the mineral densities were obtained. The mean mineral density values for permanent enamel and dentin were significantly higher than those for their primary counterparts for each tooth type. Conclusions: In the present study, we demonstrated the distribution of mineral density in sound enamel and dentin and attempted to determine the standard mineral density for each tooth type using micro-CT. The mineral density distributions found in this study contribute to our understanding of the mechanical properties of enamel and dentin. A positive correlation suggests that the systemic bone mineral density could be predicted based on the analysis of exfoliated teeth, such as in patients with hypophosphatasia. The present results may be useful in establishing a numerical standard for the mechanism involved in root fracture and for early detection of root fracture risk.

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  • An analytical solution for the axisymmetric problem of a penny-shaped crack in an elastic layer sandwiched between dissimilar materials Reviewed

    Miura Kotaro, Sakamoto Makoto, Kobayashi Koichi, Pramudita Jonas A, Tanabe Yuji

    MECHANICAL ENGINEERING JOURNAL   5 ( 3 )   18 - 00125-18-00125   2018

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    <p>Herein, we consider the axisymmetric problem of a penny-shaped crack in an elastic material sandwiched between other materials. It is assumed that the central substance is composed of an elastic layer held between two semi-infinite bodies with different elastic constants, and that the crack is situated in the central plane of the elastic layer and subjected to uniform pressures on its internal surfaces. We consider two contact conditions; perfectly bonded and frictionless contact at the interfaces with the dissimilar materials. Dual integral equations are reduced to an infinite system of simultaneous equations by expressing normal displacements on the crack surfaces as an appropriate series function. Numerical results were obtained to examine the effects of the elastic constants of the layer and semi-infinite bodies and contact conditions on the stress intensity factor at the tip of the penny-shaped crack, the distribution of normal displacement, and stress on the crack plane. Based on the results of these numerical calculations, several conclusions can be made, as follows. 1) The distributions of normal displacement and stress at the crack plane and the stress intensity factor at the tip of the crack become larger than the results for an infinite solid when the ratio of the shear modulus of the layer to that of the semi-infinite bodies is larger than 1. 2) The numerical results for normal displacement and stress, and for stress intensity factors, in the frictionless case are higher than for the perfectly bonded case regardless of the shear modulus ratio and layer thickness ratio. The difference between the perfectly bonded and frictionless cases becomes greater as the layer thickness ratio becomes smaller. 3) There is a slight difference in the stress intensity factor values obtained from the present work and the corresponding results previously reported in the literature.</p>

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  • Three-Dimensional Elastic Problem of a Penny-Shaped Crack in an Elastic Layer Sandwiched Between Dissimilar Materials

    MIURA Kotaro, SAKAMOTO Makoto, KOBAYASHI Koichi, PRAMUDITA Jonas A., TANABE Yuji

    The Proceedings of Mechanical Engineering Congress, Japan   2018   G0300401   2018

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    <p>Herein, we consider the axisymmetric problem of a penny-shaped crack in an elastic material sandwiched between other materials. It is assumed that the central substance is composed of an elastic layer held between two semi-infinite bodies with different elastic constants, and that the crack is situated in the central plane of the elastic layer and subjected to uniform pressures on its internal surfaces. Dual integral equations are reduced to an infinite system of simultaneous equations by expressing normal displacements on the crack surfaces as an appropriate series function. Numerical results were obtained to examine the effects of the elastic constants of the layer and semi-infinite bodies on the stress intensity factor at the tip of the penny-shaped crack, the distribution of normal displacement, and stress on the crack plane. As a result, there is a slight difference in the stress intensity factor values obtained from the present work and the corresponding results previously reported in the literature.</p>

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  • An analytical solution of contact problem of indentation for multi-layered material

    MIURA Kotaro, SAKAMOTO Makoto, TANABE Yuji

    The Proceedings of the Materials and Mechanics Conference   2018   GS0504   2018

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    <p>We considered the axisymmetric contact problem of multi-elastic layer with different elastic constants bonded on elastic semi-infinite substrate indented by a rigid flat-ended cylindrical indenter. In this study, the information of each elastic layers can be sorted by using transfer matrix method and dual integral equations were reduced to an infinite system of simultaneous equations by expressing a normal contact stress at the surface elastic layer as an appropriate series. Numerical results were obtained to demonstrate the effects of the elastic constants of each elastic layers and semi-infinite elastic substrate on the radial distribution of normal contact stress and normal displacement of free surface of elastic layer, stress singularity factor at the edge of cylindrical indenter, and applied load of rigid indenter which needed to penetrate to a constant depth into multi-layered materials. The present results of applied load were good agreement with the results of the previous other studies. Numerical results were given for several combinations of the shear modulus of each elastic layers and substrate, and Poisson's ratio of both each elastic layers and substrate was fixed as 0.3 throughout present study. These results give us great contribution to the establishment of the indentation tests on composite materials as well as the guideline for design of appropriate mechanical properties of layered materials.</p>

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  • Viscoelastic behavior of bovine femoral articular cartilage in relaxation indentation test

    OYAMA Chihiro, MIURA Kotaro, SAKAMOTO Makoto, KOBAYASHI Koichi, A. PRAMUDITA Jonas, TANABE Yuji

    The Proceedings of the Materials and Mechanics Conference   2018   OS0604   2018

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    <p>The indentation test has been widely used to evaluate mechanical properties of industrial and biological materials in many studies. In this study, we obtained an analytical solution of axisymmetric contact problem of viscoelastic layer bonded on rigid substrate indented by flat-ended cylindrical punch using elastic-viscoelastic corresponding principle. The relaxation indentation tests were conducted for silicon rubber, Echo PAD which is a soft material used for elastography, and articular cartilage of bovine femoral head. For articular cartilage, fresh articular cartilage was treated by collagenase after a relaxation indentation test and was then used again in same test. The viscoelastic models in this study were selected as three-element model (standard linear solid model) and five-element model (generalized Maxwell model) and viscoelastic parameters of the models were determined by fitting the analytical solution to applied load varying with time collected from the relaxation indentation test. As the results, it was suggested that the five-element model was more appropriate than three-element model to reproduce the behavior of relaxation indentation of silicon rubber, Echo PAD, and articular cartilage. Furthermore, the viscoelastic parameters of treated articular cartilage decreased sufficiently compared with those of fresh articular cartilage. From these results, it was suggested that the method of evaluating the time-dependent mechanical properties of articular cartilage based on the analytical solutions of the relaxation indentation test obtained from this study could be a useful tool for evaluating the state of degenerated cartilage.</p>

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  • Biplanar slot radiography for three-dimensional evaluation of implant position in THA. Reviewed

    岡庭大祐, 中原大輔, 小林公一, 坂本信, 田邊裕治, 佐藤卓, 大森豪, 湊泉, 古賀良生

    臨床バイオメカニクス   38   291‐298 - 298   2017.10

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  • In vivo three-dimensional analysis of the contact behavior of the metacarpophalangeal joint of the middle finger. Reviewed

    杉田魁人, 坂本信, 森清友亮, 風間清子, 小林公一, 田邊裕治

    臨床バイオメカニクス   38   103‐111 - 111   2017.10

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  • A method for automatic definition of three-dimensional anterior tooth axis using in vivo cone-beam computed tomographic images. Reviewed

    坂上勇太, 坂本信, 森清友亮, 亀田剛, 小林公一, 坂井幸子, 遠藤英昭

    臨床バイオメカニクス   38   27‐33 - 33   2017.10

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  • External torsion in a proximal tibia and internal torsion in a distal tibia occur independently in varus osteoarthritic knees compared to healthy knees Reviewed

    Tomoharu Mochizuki, Osamu Tanifuji, Yoshio Koga, Ryosuke Hata, Takahiro Mori, Katsutoshi Nishino, Takashi Sato, Koichi Kobayashi, Go Omori, Makoto Sakamoto, Yuji Tanabe, Naoto Endo

    JOURNAL OF ORTHOPAEDIC SCIENCE   22 ( 3 )   501 - 505   2017.5

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    Introduction: The relative torsional angle of the distal tibia is dependent on a deformity of the proximal tibia, and it is a commonly used torsional parameter to describe deformities of the tibia; however, this parameter cannot show the location and direction of the torsional deformity in the entire tibia. This study aimed to identify the detailed deformity in the entire tibia via a coordinate system based on the diaphysis of the tibia by comparing varus osteoarthritic knees to healthy knees.
    Methods: In total, 61 limbs in 58 healthy subjects (age: 54 18 years) and 55 limbs in 50 varus osteoarthritis (OA) subjects (age: 72 7 years) were evaluated. The original coordinate system based on anatomic points only from the tibial diaphysis was established. The evaluation parameters were 1) the relative torsion in the distal tibia to the proximal tibia, 2) the proximal tibial torsion relative to the tibial diaphysis, and 3) the distal tibial torsion relative to the tibial diaphysis.
    Results: The relative torsion in the distal tibia to the proximal tibia showed external torsion in both groups, while the external torsion was lower in the OA group than in the healthy group (p &lt; 0.0001). The proximal tibial torsion relative to the tibial diaphysis had a higher external torsion in the OA group (p = 0.012), and the distal tibial torsion relative to the tibial diaphysis had a higher internal torsion in the OA group (p = 0.004) in comparison to the healthy group.
    Conclusion: The reverse torsional deformity, showing a higher external torsion in the proximal tibia and a higher internal torsion in the distal tibia, occurred independently in the OA group in comparison to the healthy group. Clinically, this finding may prove to be a pathogenic factor in varus osteoarthritic knees. Level of evidence: Level Ill. (C) 2017 The Japanese Orthopaedic Association. Published by Elsevier B.V. All rights reserved.

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  • Determination of Elastic Modulus of Bovine Articular Cartilage Using Indentation Test

    Daisuke HIRAKI, Makoto SAKAMOTO, Koichi KOBAYASHI, Jonas A. PRAMUDITA, Yuji TANABE

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2017.54   2017

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  • 下肢変形に及ぼす大腿骨負荷の影響についての実験的検討 Reviewed

    高柳雅欣, 古賀良生, 谷藤理, 坂本信, 森清友亮, 田邊裕治

    臨床バイオメカニクス   37   149‐152 - 152   2016.9

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  • 2方向スロットラジオグラフィによる立位3次元下肢アライメント評価法 Reviewed

    高橋匠, 岡庭大祐, 小林公一, 坂本信, 田邊裕治, 佐藤卓, 大森豪, 古賀良生

    臨床バイオメカニクス   37   143‐148   2016.9

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  • 示指近位指節間関節における接触領域のMRIによる三次元生体内解析 Reviewed

    風間清子, 風間清子, 坂本信, 森清友亮, 小林公一, 近藤達也, 田邊裕治

    臨床バイオメカニクス   37   103‐108 - 108   2016.9

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  • In vivo three-dimensional analysis of distal radioulnar joint kinematics during forearm pronation-supination

    Kiyoko Kazama, Koichi Kobayashi, Makoto Sakamoto

    Journal of Biomechanical Science and Engineering   11 ( 1 )   2016

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    The action of the forearm is to transfer force and torque across the elbow and wrist, resulting in axial rotation at the distal and proximal radioulnar joints, called pronation and supination. Pronation and supination are important functions as they allow many kinds of activities of daily living. Three-dimensional (3D) motion analysis of pronation and supination is essential for a better understating of the biomechanics of the forearm to describe the physiological range of motion and optimize clinical options for disorders of the forearm. Although numerous in vitro studies have contributed to gain insights into the forearm pronation and supination, in vivo investigations are still limited. In this study, three-dimensional (3D) motion of the distal radioulnar joint (DRUJ) during forearm pronation and supination was analyzed in vivo using biplanar radiography and 3D models of the ulna and radius. Twelve healthy subjects (6 men and 6 women) were recruited for the study. Each subject's right forearm (dominant hand) underwent a computed tomography (CT) scan to create 3D surface models of the ulna and radius. Each subject was imaged using a calibrated biplanar radiographic system at 90° pronation, 45° pronation, neutral, 45° supination, and 90° supination while the elbow was in extension or flexion. The 3D positions of the radius and ulna were obtained using a 2D-to-3D image registration method. The relative translations of the radius in the radioulnar, dorsopalmar, and proximodistal directions and the relative rotations of the radius about the radioulnar, dorsopalmar, and proximodistal axes were evaluated with respect to the ulna during pronation and supination. In general, the radius translated towards the ulnar side throughout forearm rotation, and moved towards the palmar side as pronation increased and moved dorsally as supination increased, and was positioned proximally during pronation and distally during supination. The rotation of the radius was dominant about the proximodistal axis. These kinematic variables were affected by elbow position and sex of the subject. The current findings regarding the 3D kinematics of the DRUJ during forearm pronation and supination may contribute to further understanding of the physiological biomechanics of the upper limb.

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  • Assessment of 3D lower extremity alignment in standing posture using biplanar slot radiography Reviewed

    高橋 匠, 岡庭 大祐, 小林 公一, 坂本 信, 田邊 裕治, 佐藤 卓, 大森 豪, 古賀 良生

    臨床バイオメカニクス   37   143 - 148   2016

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  • Nondestructive Microcomputed Tomography Evaluation of Mineral Density in Exfoliated Teeth with Hypophosphatasia Reviewed

    Sachiko Hayashi-Sakai, Takafumi Hayashi, Makoto Sakamoto, Jun Sakai, Junko Shimomura-Kuroki, Hideyoshi Nishiyama, Kouji Katsura, Makiko Ike, Yutaka Nikkuni, Miwa Nakayama, Marie Soga, Taichi Kobayashi

    Case Reports in Dentistry   2016   2016

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    Most cases of hypophosphatasia (HPP) exhibit early loss of primary teeth. Results of microcomputed tomography (micro-CT) analysis of teeth with HPP have rarely been reported. The purpose of the present study was to describe the mineral density distribution and mapping of exfoliated teeth from an HPP patient using micro-CT. Four exfoliated teeth were obtained from a patient with HPP. Enamel and dentin mineral densities of exfoliated teeth were measured on micro-CT. The mean values of enamel and dentin mineral densities in mandibular primary central incisors with HPP were 1.61 and 0.98 g/cm3, respectively. The corresponding values in the mandibular primary lateral incisors were 1.60 and 0.98 g/cm3, respectively. Enamel hypoplasia was seen in the remaining teeth, both maxillary and mandibular primary canines and first and second molars. Micro-CT enables nondestructive, noninvasive evaluation and is useful for studying human hard tissues obtained from patients.

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  • マイクロCTによる脱落歯のミネラル密度評価 ‐低フォスファターゼ症例への応用‐ Reviewed

    坂井幸子, 坂本信, 林孝文, 坂井淳, 下村-黒木淳子, 梨田智子

    実験力学   16 ( 2 )   122‐126(J‐STAGE) - 126   2016

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    Micro computed tomography (Micro CT) is an imaging technique widely used for visualizing the internal structure of objects using the x-ray attenuation method. As it enables non-destructive, noninvasive evaluation and three-dimensional analysis, it is useful for various studies of human hard tissues. Most hypophosphatasia cases exhibit early loss of primary teeth, however findings of Micro CT analysis of them have not been reported. The purpose of the present study was to describe the mineral density distribution of exfoliated teeth with hypophosphatasia using Micro CT. Each two exfoliated teeth of mandibular primary central incisors gained from 2 hypophosphatasia patients were investigated for enamel and dentin mineral densities. Mineral density distribution revealed that the case 1 were lower than the homonymous teeth case 2 in the region of enamel edge in enamel and dentinoenamel junction in dentin. These results suggested that hypophosphatasia patients had the variety of hypomineralization in the primary dentition. The investigations using Micro CT is useful for various studies of human hard tissues gained from patients since it enables non-destructive, noninvasive evaluation.

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  • 1方向正面動画による歩行解析の提案

    川上健作, 浜克己, 小林公一, 坂本信

    実験力学   16 ( 2 )   116‐121(J‐STAGE) - 121   2016

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    In the clinical, it is difficult to carry out the motion analysis because it requires a large place. The purpose of this study is to examine the gait analysis method by one direction frontal video that can be easily measured in clinical. The subjects were five healthy persons attached four markers at both shoulders and both anterior superior iliac spine (ASIS). The walking motion of each subject toward a camera was analyzed. Body trunk tilt and centroid sway of the upper body part were calculated and compared with the results of three-dimensional gait analysis methods. The result showed the same tendency of the body trunk tilt and the centroid sway changes based on each method. The result suggested that the gait analysis by one direction frontal video could evaluate the large abnormal gait. Further, authors evaluated OA knee joint thrust using one direction frontal video. The change of the knee joint alignment and the distance between the loading axis of lower extremity and knee joint center were calculated as knee joint thrust. Results showed that knee adduction angle and distance of knee joint center from lower limb loading axis of OA patient were increased. The result suggested that this method could evaluate the knee joint thrust of OA patient.

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  • 核磁気共鳴画像による膝関節の屈曲に伴うヒト後十字靱帯の生体内力学挙動解析 Reviewed

    近藤達也, 近藤達也, 小林公一, 坂本信

    実験力学   16 ( 2 )   127‐133(J‐STAGE) - 133   2016

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    The posterior cruciate ligament (PCL) functions as the primary restraint to posterior tibial movement and the stabilizer for axial rotation of the knee joint. It is, therefore, important to know the mechanical characteristics of the PCL. The objective of this study was to evaluate the in vivo characteristics of the three-dimensional (3D) deformation and orientation of the PCL during knee flexion using magnetic resonance imaging (MRI). Ten normal knees were visualized using MRI at full extension (FE), 10°, 20°, 30° and 60° of static knee flexion. The length, strain, elevation and deviation of the PCL were measured using the 3D models of the femur, tibia and PCL reconstructed from the MR images. The PCL length was measured in three portions (Medial: M, Central: C, Lateral: L) to consider its 3D shape. Tendencies of the PCL elongation and strain during knee flexion were different among these 3 portions. The PCL length in M portion was shortest in 10° or 20° and extended in FE and 60°. The PCL length in L portion, on the other hand, extended from FE to 60°. These 3D deformation characteristics were consisted with the changes in the elevation and deviation of the PCL during knee flexion.

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  • 2方向スロットラジオグラフィと3次元形状モデルによる人工膝関節アライメントと人工関節設置位置評価法 Reviewed

    小林公一, 高橋匠, 岡庭大祐, 坂本信, 田邊裕治, 佐藤卓, 大森豪, 古賀良生

    実験力学   16 ( 2 )   134‐139(J‐STAGE) - 139   2016

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    The purpose of this study was to develop a method for evaluation of the three-dimensional (3D) alignment and position of the artificial knee joint using a biplanar slot radiography (SR) system and 3D models. A SR system uses collimated fan beam x-rays synchronized with the movement of a flat-panel detector. This system allows to obtain a full length x-ray image of the body with reduced dose and smaller image distortion compared with conventional x-ray systems. The biplanar SR system used a rotation table positioned at 0 deg and 60 deg relative to the optical axis of an X-ray source. Camera calibration was performed using an acrylic frame with 72 radiopaque markers. The femoral and tibial components of a total knee replacement system were immobilized and imaged using the biplanar SR system. Then, the femoral component was installed on a sawbone femur and imaged again. The 3D positions of the components and femur were recovered using an interactive 2D to 3D image registration method. Overall, the largest estimation errors were within 1 mm in translation and 1 deg in rotation, demonstrating that this method has an adequate accuracy for the clinical usage.

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  • 車いすハンドル高さと降坂移送をする介助者の上肢負担に関する検討 Reviewed

    水谷都, 坂本信, 川上健作, 定方美恵子, 小林公一

    臨床バイオメカニクス   36   259 - 265   2015.10

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  • コーンビームCTによる三次元歯軸の自動決定 Reviewed

    坂本信, 春日勇人, 坂井幸子, 小林公一, 小林公一, 遠藤英昭

    臨床バイオメカニクス   36   119 - 125   2015.10

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  • 回内・回外における橈骨‐尺骨間運動の三次元生体内解析 Reviewed

    風間清子, 風間清子, 春日勇人, 小林公一, 坂本信

    臨床バイオメカニクス   36   17 - 22   2015.10

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  • Three-dimensional dynamic analysis of knee joint during gait in medial knee osteoarthritis using loading axis of knee Reviewed

    Katsutoshi Nishino, Go Omori, Yoshio Koga, Koichi Kobayashi, Makoto Sakamoto, Yuji Tanabe, Masaei Tanaka, Masaaki Arakawa

    GAIT & POSTURE   42 ( 2 )   127 - 132   2015.7

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    We recently developed a new method for three-dimensional evaluation of mechanical factors affecting knee joint in order to help identify factors that contribute to the progression of knee osteoarthritis (KOA). This study aimed to verify the clinical validity of our method by evaluating knee joint dynamics during gait. Subjects were 41 individuals (14 normal knees; 8 mild KOAs; 19 severe KOAs). The positions of skin markers attached to the body were captured during gait, and bi-planar X-ray images of the lower extremities were obtained in standing position. The positional relationship between the markers and femorotibial bones was determined from the X-ray images. Combining this relationship with gait capture allowed for the estimation of relative movement between femorotibial bones. We also calculated the point of intersection of loading axis of knee on the tibial proximal surface (LAK point) to analyze knee joint dynamics. Knee flexion range in subjects with severe KOA during gait was significantly smaller than that in those with normal knees (p = 0.011), and knee adduction in those with severe KOA was significantly larger than in those with mild KOA (p &lt; 0.000). LAK point was locally loaded on the medial compartment of the tibial surface as KOA progressed, with LAK point of subjects with severe KOA rapidly shifting medially during loading response. Local loading and medial shear force were applied to the tibial surface during stance phase as medial KOA progressed. Our findings suggest that our method is useful for the quantitative evaluation of mechanical factors that affect KOA progression. (C) 2015 Elsevier B.V. All rights reserved.

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  • Development of phantom for quantitative analyses of human dentin mineral density Reviewed

    Sachiko Hayashi-Sakai, Tatsuya Kondo, Yuto Kasuga, Makoto Sakamoto, Hideaki Endo, Jun Sakai

    BIO-MEDICAL MATERIALS AND ENGINEERING   26 ( 1-2 )   57 - 65   2015

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    The purpose of the present study was to develop a novel-designed phantom that could be scanned with a sample in the same image, that specialize for quantitative analyses of human dentin mineral density using the X-ray attenuation method. A further attempt was made to demonstrate the intracoronal dentin mineral density using this phantom in mandibular incisors. The phantom prepared with a 15 mm hole in the center of an acrylic resin bar having an outside diameter of 25 mm and 8 small holes (diameter, 3 mm) were made at equal intervals around the center. Liquid dipotassium hydrogen phosphate (K2HPO4) solutions were established at 0.4, 0.6, 0.8 and 1.0 g/cm(3), and were arranged to these holes. The mean value of the intracoronal dentin mineral density was 1.486 +/- 0.016 g/cm(3) in the present study. As the results of the present study corresponded to previous reports, this new phantom was considered to be useful. This phantom enables the analysis of samples that are not readily available by conventional mechanical tests and may facilitate biomechanical investigations using X-ray images. It was suggested that this system is a simple, accurate and novel mineralization measuring system.

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  • Three-dimensional in vivo analysis of the contact area and motion of the metacarpophalangeal joint of the index finger using MRI Reviewed

    坂本 信, 春日 勇人, 風間 清子, 小林 公一

    臨床バイオメカニクス   36   7 - 15   2015

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  • 3D‐3D image matchingによるTKA設置位置評価法 Reviewed

    本江香澄, 佐藤卓, 児玉陸, 坂本信, 田邊裕治

    臨床バイオメカニクス   35   143 - 147   2014.10

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  • 関節接触応力の理論モデル解析―関節接触面の垂直応力に関する評価― Reviewed

    坂本信, 小林公一

    臨床バイオメカニクス   35   387 - 394   2014.10

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  • マイクロCTを用いた三次元歯軸の評価 Reviewed

    坂本信, 春日勇人, 坂井幸子, 小林公一, 遠藤英昭

    臨床バイオメカニクス   35   99 - 104   2014.10

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  • MRIボリュームデータのレンダリングによる膝関節の3次元位置推定法 Reviewed

    小林公一, 坂本信, 田邊裕治, 佐藤卓, 大森豪, 古賀良生

    臨床バイオメカニクス   35   131 - 135   2014.10

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  • Biomechanical effects of push handle heights on upper limbs during attendant propelled wheelchair ramp transportation Reviewed

    Mizutani M, Kawakami K, Sadakata M, Kobayashi K, Sakamoto M

    Journal of the Japanese Society of Experimental Mechanics   14   s291 - s295   2014.8

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  • Automatic construction of an anatomical coordinate system for three-dimensional bone models of the lower extremities - Pelvis, femur, and tibia Reviewed

    Shin Kai, Takashi Sato, Yoshio Koga, Go Omori, Koichi Kobayashi, Makoto Sakamoto, Yuji Tanabe

    JOURNAL OF BIOMECHANICS   47 ( 5 )   1229 - 1233   2014.3

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    Automated methods for constructing patient-specific anatomical coordinate systems (ACSs) for the pelvis, femur and tibia were developed based on the bony geometry of each, derived from computed tomography (CT). The methods used principal axes of inertia, principal component analysis (PCA), cross-sectional area, and spherical and ellipsoidal surface fitting to eliminate the influence of rater's bias on reference landmark selection. Automatic ACSs for the pelvis, femur, and tibia were successfully constructed on each 3D bone model using the developed algorithm. All constructions were performed within 30 s; furthermore, between- and within- rater errors were zero for a given CT-based 3D bone model, owing to the automated nature of the algorithm. ACSs recommended by the International Society of Biomechanics (ISB) were compared with the automatically constructed ACS, to evaluate the potential differences caused by the selection of the coordinate system. The pelvis ACSs constructed using the ISB-recommended system were tilted significantly more anteriorly than those constructed automatically (range, 9.6-18.8 degrees). There were no significant differences between the two methods for the femur. For the tibia, significant differences were found in the direction of the anteroposterior axis; the anteroposterior axes identified by ISB were more external than those in the automatic ACS (range, 17.5-25.0 degrees). (C) 2013 Elsevier Ltd. All rights reserved.

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  • Image registration method for assessing 3D hip alignment and implant position during standing posture

    KOBAYASHI Koichi, KAI Shin, SAKAMOTO Makoto, TANABE Yuji, TOKUNAGA Kunihiko, MINATO Izumi, SATO Takashi, KOGA Yoshio

    JBSE   2014

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    The range of motion (ROM) resulting from total hip arthroplasty (THA) depends on the relative orientation of the femoral and acetabular components, and malpositioning of components is a possible cause of several complications. The purpose of this study was to validate a 3-dimensional (3D) lower extremity alignment assessment system (3D LAAS) for the measurement of alignment of natural and implanted hip joints and implant position with respect to the target bone with the subject in a standing position. Sawbone femur and pelvis and femoral and acetabular components of a total hip arthroplasty system were used. Three spherical markers were attached to each sawbone and each component to define the local coordinate system. Outlines of the 3D bone models and component computer-aided design models were projected onto extracted contours of the femur, pelvis, and implants in calibrated frontal and oblique X-ray images. The 3D position of each model was recovered by minimizing the differences between projected outlines and contours. Mean absolute errors were less than 1.27 ± 0.79 mm and 0.99 ± 0.52° for femur and pelvis, 1.64 ± 0.66 mm and 1.54 ± 0.39° for femoral and acetabular components, 1.58 ± 0.29 mm and 1.75 ± 0.69° for femur and femoral component, and 1.51 ± 0.49 mm and 1.24 ± 0.14° for pelvis and acetabular component, indicating that the 3D LAAS is applicable to measure the alignment of natural and implanted hip joints and implant position after THA.

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  • In Vivo Kinematics of the Extensor Mechanism of the Knee During Deep Flexion Reviewed

    Koichi Kobayashi, Ali Hosseini, Makoto Sakamoto, Wei Qi, Harry E. Rubash, Guoan Li

    JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME   135 ( 8 )   81002   2013.8

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    While various factors have been assumed to affect knee joint biomechanics, few data have been reported on the function of the extensor mechanism in deep flexion of the knee. This study analyzed the patellofemoral joint contact kinematics and the ratio of the quadriceps and patellar tendon forces in living subjects when they performed a single leg lunge up to 150 deg of flexion. The data revealed that in the proximal-distal direction, the patellofemoral articular contact points were in the central one-third of the patellar cartilage. Beyond 90 deg of flexion, the contact points moved towards the medial-lateral edges of the patellar surface. At low flexion angles, the patellar tendon and quadriceps force ratio was approximately 1.0 but reduced to about 0.7 after 60 deg of knee flexion, implying that the patella tendon carries lower loads than the quadriceps. These data may be valuable for improvement of contemporary surgical treatments of diseased knees that are aimed to achieve deep knee flexion.

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  • 視線運動測定とリフレクションを用いた新人看護師への教育支援の検討~教育支援者への働きかけの分析~ Reviewed

    西方真弓, 定方美恵子, 中澤紀代子, 西原亜矢子, 牧岡諒太, 坂本 信, 小浦方 格, 笠井美香子, 井越寿美子, 廣川佐代子, 佐藤富貴子, 田邊裕治

    日本看護学会論文集 看護管理   43   319 - 322   2013

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  • 臨床力と研究力を融合できる大学院教育~臨床力と研究力のダブルストランドで織りなす高度専門医療職教育~ Reviewed

    坂本 信, 定方美恵子, 渡邉タミ子, 住吉智子, 藤原直士, 平野茂樹, 佐井篤儀, 鈴木力

    大学教育・学習研究   1 ( 1 )   40 - 45   2013

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  • In-vivo patellar tendon kinematics during weight-bearing deep knee flexion Reviewed

    Koichi Kobayashi, Makoto Sakamoto, Ali Hosseini, Harry E. Rubash, Guoan Li

    JOURNAL OF ORTHOPAEDIC RESEARCH   30 ( 10 )   1596 - 1603   2012.10

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    This study quantified in-vivo 3D patellar tendon kinematics during weight-bearing deep knee bend beyond 150 degrees. Each knee was MRI scanned to create 3D bony models of the patella, tibia, femur, and the attachment sites of the patellar tendon on the distal patella and the tibial tubercle. Each attachment site was divided into lateral, central, and medial thirds. The subjects were then imaged using a dual fluoroscopic image system while performing a deep knee bend. The knee positions were determined using the bony models and the fluoroscopic images. The patellar tendon kinematics was analyzed using the relative positions of its patellar and tibial attachment sites. The relative elongations of all three portions of the patellar tendon increased similarly up to 60 degrees Beyond 60 degrees, the relative elongation of the medial portion of the patellar tendon decreased as the knee flexed from 60 degrees to 150 degrees while those of the lateral and central portions showed continuous increases from 120 degrees to 150 degrees. At 150 degrees, the relative elongation of the medial portion was significantly lower than that of the central portion. In four of seven knees, the patellar tendon impinged on the tibial bony surface at 120 degrees and 150 degrees of knee flexion. These data may provide useful insight into the intrinsic patellar tendon biomechanics during a weight-bearing deep knee bend and could provide biomechanical guidelines for future development of total knee arthroplasties that are intended to restore normal knee function. (c) 2012 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 30:15961603, 2012

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  • MRIを用いた膝蓋腱長さ変化の生体内解析 Reviewed

    坂本信, 長田郁美, 吉田秀義, 風間清子, 川上健作, 小林公一

    臨床バイオメカニクス   33   81 - 87   2012.10

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  • 透過型近赤外分光法によるヒト関節軟骨含水率の定量的評価 Reviewed

    山岸英大, 佐藤光, 田邊裕治, 菊池達哉, 坂本信, 小林公一, 古賀良生

    臨床バイオメカニクス   33   13 - 17   2012.10

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  • Determination of fracture toughness of human permanent and primary enamel using an indentation microfracture method Reviewed

    Sachiko Hayashi-Sakai, Jun Sakai, Makoto Sakamoto, Hideaki Endo

    JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE   23 ( 9 )   2047 - 2054   2012.9

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    The purpose of the present study was to examine the fracture toughness and Vickers microhardness number of permanent and primary human enamel using the indentation microfracture method. Crack resistance and a parameter indirectly related to fracture toughness were measured in 48 enamel specimens from 16 permanent teeth and 12 enamel specimens obtained from six primary teeth. The Vickers microhardness number of the middle portion was greater than the upper portion in primary enamel. The fracture toughness was highest in the middle portion of permanent enamel, because fracture toughness greatly depends upon microstructure. These findings suggest that primary teeth are not miniature permanent teeth but have specific and characteristic mechanical properties.

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  • 看護師の視線運動と観察の意図 ―新人看護師と臨床経験豊富な看護師との比較―

    西方真弓, 牧岡諒太, 中澤紀代子, 定方美恵子, 笠井美香子, 井越寿美子, 坂本信, 小浦方格, 西原亜矢子, 川上健作, 佐藤富貴子, 広川佐代子, 伊藤千恵美, 田中京子, 田邊裕治

    新潟大学医学部保健学科紀要   10 ( 2 )   11 - 21   2012.3

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  • 人工股関節摺動面における応力分布の数値解析 Reviewed

    解晨, 坂本信, 西野勝敏, 湊泉, 古賀良生, 佐藤卓, 小林公一, 大森豪, 田邊裕治

    臨床バイオメカニクス   32   283 - 289   2011.10

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  • 3次元下肢アライメント評価システムを用いた人工股関節ステム挿入管理法の開発 Reviewed

    窪田陽介, 藤原諒, 坂本信, 小林公一, 古賀良生, 湊泉, 落合清秀, 清徳則雄

    臨床バイオメカニクス   32   339 - 345   2011.10

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  • MRIを用いた脛距関節における接触領域のIn Vivo解析 Reviewed

    坂本信, 牧岡諒太, 吉田秀義, 小林公一, 笹川圭右, 田邊裕治

    臨床バイオメカニクス   32   215 - 223   2011.10

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  • Validation of near infrared spectroscopy for measurement of water content in human articular cartilage using gelatin model Reviewed

    Yamagishi E, Tanabe Y, Kikuchi T, Sakamoto M, Kobayashi K

    Journal of the Japanese Society of Experimental Mechanics   11   ss239 - ss243   2011.8

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    This paper deals with the applicability of the near infrared (NIR) spectroscopy to quantitative measurement of the water content in human articular cartilage using gelatin model. We developed the device using NIR light at a wave length of 970nm, and investigated whether or not the device was useful for the measurement of the water content in articular cartilage. The gelatin was used as materials for the specimens with single, two- and three-layers. The absorbance defined as the intensity ratio between emitting and receiving NIR lights, the variation of receiving light intensity with the water content, and that with the distance between two probes of the light source and sensor were measured. The absorbance increased with increasing water content and with increasing probe distance (R<SUP>2</SUP>=0.86&sim;0.91). In the layered specimens, the light was supposed to pass through the surface layer and then reach the adjacent layer. These results showed that the device was useful for the measurement of the water content in the single and layered specimens. This study suggested that the device developed in this study have some possibilities of acquiring the quantitative data of water content at any point from the surface of articular cartilage.

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  • Development of a Patient-Specific Method for Contact Stress Analysis on the Bearing Surface of Total Hip Arthroplasty Reviewed

    Kai Shin, Sakamoto Makoto, Tanabe Yuji

    実験力学   11 ( 2 )   112 - 117   2011.6

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    The modern and widely known artificial hip joint developed by John Charnley in the 1970s consisted of three parts, 1. a metallic femoral stem, 2. a UHMWPE acetabular liner, 3. a metallic acetabular socket or bone cement. Acetabular liner has a bearing surface of UHMWPE which has a low coefficient of friction and low wear rate. In the long term, wear particulate dose accumulate and lead to a condition known as osteolysis, which leads to bone loss, joint loosening, discomfort, and ultimately limits the lifespan of the artificial joint. Therefore, the evaluation of the wear on acetabular bearings, which depends directly on contact pressure, is essential to analyze the failure of the acetabular implant, as well as for a better design of artificial joint. The objective of the present study was to develop a method of applying discrete element analysis (DEA) based on rigid-body-spring-model (RBSM) to artificial hip joint, using patient-specific 3D bone model and motion capture data, and to analyze the stress distribution on bearing surface during gait motion. The two peaks in peak stress were observed with a maximum value of 12.3 MPa and the corresponding contact area was 21.8% of total bearing area, and small contact area less than 25% at the edge of the superior bearing surface was observed during gait motion.

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  • Development of a Patient-Specific Method for Contact Stress Analysis on the Bearing Surface of Total Hip Arthroplasty Reviewed

    解晨, 坂本信, 田邊裕治

    実験力学   11 ( 2 )   112 - 117   2011.6

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  • MRI骨・軟骨モデルを用いた3次元下肢アライメント評価システムの精度評価 Reviewed

    笹川圭右, 坂本信, 小林公一, 古賀良生, 田邊裕治, 大森豪, 佐藤卓

    臨床バイオメカニクス   31   341 - 348   2010.9

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  • 距骨および踵骨海綿骨のMRIによるIn Vivo構造解析 Reviewed

    坂本信, 笹川圭右, 窪田陽介, 小林公一, 吉田秀義

    臨床バイオメカニクス   31   13 - 20   2010.9

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  • 軟骨における近赤外線の透過特性―ゼラチンモデルによる基礎的検討― Reviewed

    松本剛, 小田島広記, 菊池達哉, 小林公一, 坂本信, 田邊裕治, 古賀良生

    臨床バイオメカニクス   31   73 - 77   2010.9

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  • 脛骨骨形状コンピュータモデルの座標系自動構築法 Reviewed

    解晨, 笹川圭右, 古賀良生, 佐藤卓, 谷藤理, 坂本信, 小林公一, 田邊裕治

    臨床バイオメカニクス   31   333 - 340   2010.9

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  • 3次元下肢アライメント評価システムを用いた人工股関節ステム設置管理法におけるイメージマッチングの精度検証 Reviewed

    窪田陽介, 坂本信, 小林公一, 古賀良生, 湊泉, 伊藤知之, 清徳則雄

    臨床バイオメカニクス   31   313 - 319   2010.9

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  • イメージレジストレーション法による膝関節の接触動態解析 Reviewed

    小田川健一, 豊田貴嗣, 小林公一, 谷藤理, 笹川圭右, 佐藤卓, 坂本信, 古賀良生, 田邊裕治, 大森豪

    臨床バイオメカニクス   31   349 - 355   2010.9

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  • Three-dimensional In vivo contact analysis of the wrist joint during wrist motion Reviewed

    Sasagawa K, Sakamoto M, Yoshida H, Kobayashi K, Tanabe Y

    Journal of the Japanese Society of Experimental Mechanics   10   ss261 - ss266   2010.8

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    The wrist joint is condyloid and capable of movement through two axes: palmar/dorsal flexion and radial/ulnar deviation. Knowledge of <i>in vivo</i> joint mechanics is important for understanding pathological mechanisms and the treatment of various joint problems. The purpose of this study was to investigate the <i>in vivo</i> wrist joint mechanism during wrist motion. <i>In vivo</i> wrist joint contact and the kinematics of the scaphoid and lunate during palmar/dorsal flexion and radial/ulnar deviation were examined using magnetic resonance imaging (MRI). The wrist joints of 15 healthy young volunteers were scanned at 8 positions (.30 deg of palmar flexion; neutral; 30, 60, and 90 deg of dorsal flexion; .20 deg of radial deviation; neutral; and 20 deg of ulnar deviation). Contact of the wrist joint was estimated quantitatively from the derived MR images. Using three-dimensional surface models of the carpal bones, the kinematics of the scaphoid and lunate were analyzed three-dimensionally.

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  • In vivo contact areas of tibiotalar joint measured with magnetic resonance imaging Reviewed

    Sakamoto M, Nodaguchi Y, Tanabe Y, Sasagawa K, Kubota Y, Kobayashi K

    Journal of the Japanese Society of Experimental Mechanics   10   ss247 - ss250   2010.8

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    DOI: 10.11395/jjsem.10.s234

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  • Accuracy verification of image-matching in a setting method for the stem during total hip arthroplasty Reviewed

    Kubota Y, Sakamoto M, Kobayashi K, Koga Y, Tanabe Y

    Journal of the Japanese Society of Experimental Mechanics   10   ss234 - ss239   2010.8

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    Currently, stem insertion during total hip arthroplasty (THA) is not well controlled. The present study investigated a method for improving stem setting in accordance with preoperative planning using a three-dimensional (3-D) computed tomography (CT) model of the femur and RGB images of the excised femoral head. We utilized three femoral heads removed during THA and modeled each head using three spherical acrylic markers. Each femoral head was osteotomized using a parallel jig and three rectangular images of the osteotomized head were taken using a CCD camera. Each femoral head was then set on a camera base and RGB images were taken from three orthogonal directions using the CCD camera. The B-images of the femoral head and the 3-D bone model were processed through image-matching software using an automatic outline extraction and downhill simplex method. The position of the contralateral side of the jig, related to the femur, was measured using a 3-D measuring system in order to validate the accuracy of the image-matching. However, since validation of the accuracy of the image-matching is difficult once the femoral head is excised, a six-degree-of-freedom board was used to facilitate the accuracy validation.

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  • Numerical analysis of pressure on cup surface after THA Reviewed

    Kai S, Sakamoto M, Kobayashi K, Minato I, Koga Y, Tanabe Y

    Journal of the Japanese Society of Experimental Mechanics   10   ss251 - ss255   2010.8

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    Estimation of the artificial hip joint contact area and pressure distribution during motions of daily life is important in predicting joint degeneration mechanism and implant wear. The purpose of this study was to develop a method of applying discrete element analysis (DEA) based on a rigid body spring model to artificial hip joint, and to analyze contact area and pressure distribution during different motions. Post-operative motion analyses of four basic motions, such as fast walking, slow walking, standing up and sitting down were performed by using VICON system and Kistler force plate. Implant orientation was obtained by matching the contours of 3D bone model and implant CAD model to those of the biplanar CR images. Triangular mesh at interior surface of cup model was considered as liner surface and used for applying DEA to artificial hip joint.Because stem model was considered to be a rigid body and consequential transformations occurred only inside the liner model, triangular mesh was considered to be a compressive spring respectively.The change of contact area and the pressure distribution under dynamic condition were calculated easily through these considerations, and rapid increase accompanied with change of area was observed in knee bending motions.

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  • Automated image registration for assessing three-dimensional alignment of entire lower extremity and implant position using bi-plane radiography Reviewed

    Koichi Kobayashi, Makoto Sakamoto, Yuji Tanabe, Akihiro Ariumi, Takashi Sato, Go Omori, Yoshio Koga

    JOURNAL OF BIOMECHANICS   42 ( 16 )   2818 - 2822   2009.12

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    An automated image-matching technique is presented to assess alignment of the entire lower extremity for normal and implanted knees and the positioning of implants with respect to bone. Sawbone femur and tibia and femoral and tibial components of a total knee arthroplasty system were used. Three spherical markers were attached to each sawbone and each component to define the local coordinate system. Outlines of the three-dimensional (3D) bone models and component computer-aided design (CAD) models were projected onto extracted contours of the femur, tibia, and implants in frontal and oblique X-ray images. Three-dimensional position of each model was recovered by minimizing the difference between the projected outline and the contour. Median values of the absolute error in estimating relative positions were within 0.5 mm and 0.6 degrees for the femur with respect to the tibia, 0.5 mm and 0.5 degrees for the femoral component with respect to the tibial component, 0.6 mm and 0.6 degrees for the femoral component with respect to the femur, and 0.5 mm and 0.4 degrees for the tibial component with respect to the tibia, indicating significant improvements when compared to manually obtained results. (C) 2009 Elsevier Ltd. All rights reserved.

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  • Determination of Joint Contact Area Using MRI Reviewed

    吉田秀義, 小林公一, 坂本信, 田邊裕治

    日本放射線技術学会雑誌   65 ( 10 )   1407-1414 (J-STAGE) - 1414   2009.10

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    Elevated contact stress on the articular joints has been hypothesized to contribute to articular cartilage wear and joint pain. However, given the limitations of using contact stress and areas from human cadaver specimens to estimate articular joint stress, there is need for an &lt;i&gt;in vivo&lt;/i&gt; method to obtain such data. Magnetic resonance imaging (MRI) has been shown to be a valid method of quantifying the human joint contact area, indicating the potential for &lt;i&gt;in vivo&lt;/i&gt; assessment. The purpose of this study was to describe a method of quantifying the tibiofemoral joint contact area using MRI. The validity of this technique was established in porcine cadaver specimens by comparing the contact area obtained from MRI with the contact area obtained using pressure-sensitive film (PSF). In particular, we assessed the actual condition of contact by using the ratio of signal intensity of MR images of cartilage surfaces. Two fresh porcine cadaver knees were used. A custom loading apparatus was designed to apply a compressive load to the tibiofemoral joint. We measured the contact area by using MRI and PSF methods. When the ratio of signal intensity of the cartilage surface was 0.9, the error of the contact area between the MR image and PSF was about 6%. These results suggest that this MRI method may be a valuable tool in quantifying joint contact area&lt;i&gt; in vivo&lt;/i&gt;.

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  • 3次元下肢アライメント評価システムを用いた人工股関節ステム設置管理法の開発

    窪田陽介, 坂本信, 小林公一, 古賀良生, 佐藤卓, 田邊裕治, 解晨, 清徳則雄

    臨床バイオメカニクス   30   301 - 306   2009.9

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  • MRIによる橈骨手根関節の3次元接触領域解析 Reviewed

    笹川圭右, 坂本信, 小林公一, 吉田秀義, 田邊裕治

    臨床バイオメカニクス   30   89 - 95   2009.9

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  • MRIによる海綿骨の3次元構造解析 Reviewed

    坂本信, 比護祐介, 笹川圭右, 小林公一, 吉田秀義, 宮尾益尚

    臨床バイオメカニクス   30   27 - 33   2009.9

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  • 1方向X線像を用いた骨の2D‐3Dイメージレジストレーション精度 Reviewed

    小田川健一, 小林公一, 坂本信, 谷藤理, 田邊裕治, 古賀良生, 佐藤卓, 大森豪

    臨床バイオメカニクス   30   457 - 461   2009.9

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  • モーション・キャプチャー・システムを用いた大腿脛骨関節の3次元運動推定法の開発―3次元下肢アライメント評価システムの3次元運動解析への応用― Reviewed

    木村太郎, 西野勝敏, 解晨, 大森豪, 田邊裕治, 坂本信, 小林公一, 清徳則雄, 古賀良生

    臨床バイオメカニクス   30   487 - 492   2009.9

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  • MRIモデルの3次元下肢アライメント評価システムへの応用 Reviewed

    笹川圭右, 石谷周一, 坂本信, 小林公一, 林豊彦, 田邊裕治, 佐藤卓, 大森豪, 古賀良生

    臨床バイオメカニクス   30   479 - 486   2009.9

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  • Three-dimensional contact analysis of human wrist joint using MRI Reviewed

    Sasagawa K, Sakamoto M, Yoshida H, Kobayashi K, Tanabe Y

    Japanese Society of Experimental Mechanics   9   ss167 - ss171   2009.8

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  • Viscoelastic properties of microstructural components of rat cortical bone tissue measured by dynamic nanoindentation Reviewed

    Sakamoto M, Kobayashi K

    Journal of the Japanese Society of Experimental Mechanics   9   ss151 - ss155   2009.8

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    Dynamic nanoindentation was used to determine microstructural viscoelastic properties of single osteons and interstitial lamellae of rat cortical bone tissue. The effects of mineral, organic and water contents on macrostructural viscoelastic properties were also investigated. Compared to interstitial lamellae, the storage moduli of osteons were significantly lower; however, loss tangents were higher. The storage modulus and mineral content were correlated, and the loss tangent and the organic and water contents were linearly correlated.

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  • Imaged-based matching for natural knee kinematics measurement using single-plane fluoroscopy Reviewed

    Kobayashi K, Tanaka N, Odagawa K, Sakamoto M, Tanabe Y

    Journal of the Japanese Society of Experimental Mechanics   9   ss162 - ss166   2009.8

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  • Development of Controlling Stem Setting Using Image-matching in Total Hip Arthroplasty Reviewed

    KUBOTA YOUSUKE, Sakamoto M, Kobayashi K, Koga Y, Sato T, Tanabe Y, Kai S, Seitoku N

    4th Asian Pacific Conference on Biomechanics   337   2009.4

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  • Accuracy of single plane X-ray image-based technique for assessment of knee kinematics Reviewed

    Koichi Kobayashi, Ken-ichi Odagawa, Makoto Sakamoto, Yuji Tanabe

    Journal of Biomechanical Science and Engineering   4 ( 2 )   192 - 200   2009

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    The purpose of the present study is to develop a direct and accurate method for measuring knee kinematics by using single-plane fluoroscopy. The study was carried out on a human cadaver femur. Computed tomography (CT) scan data of the femur was taken in order to construct 3D bone volume model of the femur. The femur was placed on an acrylic holder that was attached to a micromanipulator. The femur was rotated about in each orthogonal axis of the micromanipulator over a range of ±2° in 1° increments and then translated along each orthogonal axis over a range of ±2 mm in 1-mm increments. The 3-dimensional (3D) position of the femur (in other words, the 6 degree-of-freedom (DOF) parameters) was recovered by matching the digitally reconstructed radiographs (DRRs) generated from the 3D volume model of the femur and single-plane fluoroscopic images taken from the 25 positions generated by using the micromanipulator. The root-mean-square error (RMSE) of the overall rotation parameters was within 1.4°. For the translation parameters RMSE took its maximal value of 7.8 mm in the out-of-plane direction. This indicates that the present method has potential for clinical application. Copyright © 2009 by The Japan Society of Mechanical Engineers.

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  • Estimation of Mineral Density and Viscoelastic Properties of Human Dentin. Reviewed

    坂本信, 北村拓也, 笹川圭右, 小林公一, 遠藤英昭, 伊藤秀美

    日本臨床バイオメカニクス学会誌   29   153 - 159   2008.11

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  • Measurement of water content in articular cartilage using near infrared spectroscopic meter.-Attenuation characteristics of near infrared ray- Reviewed

    佐藤真也, 濱田一成, 田邊裕治, 坂本信, 小林公一, 菊池達哉, 古賀良生

    日本臨床バイオメカニクス学会誌   29   81 - 86   2008.11

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  • Accuracy Examination of Three-Dimensional Bone Surface Model Using MRI and CT. Reviewed

    笹川圭右, 渡辺聡, 小林公一, 坂本信, 田邊裕治, 佐藤卓, 古賀良生

    日本臨床バイオメカニクス学会誌   29   397 - 402   2008.11

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  • Accuracy of 3-D pose estimation of bone using an image matching technique with fluoroscopic images and 3-D bone model. Reviewed

    田中伸明, 小林公一, 田邊裕治, 佐藤卓, 古賀良生, 大森豪, 坂本信

    日本臨床バイオメカニクス学会誌   29   403 - 408   2008.11

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  • Accuracy of automated image matching technique of bone and implants using biplanar radiography. Reviewed

    小林公一, 田中伸明, 小田川健一, 佐藤卓, 坂本信, 田邊裕治, 大森豪, 古賀良生

    日本臨床バイオメカニクス学会誌   29   421 - 425   2008.11

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  • The clinical oro-facial findings of an 11-year-old Japanese boy with 47, XYY: A case report

    HAYASHI‐SAKAI Sachiko, SAKAI Jun, KITAMURA Takuya, SAKAMOTO Makoto, TAGUCHI Yo

    Pediatr Dent J   18 ( 2 )   179 - 186   2008.9

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    47, XYY is a sex chromosome-number disorder occurring in males. Pediatric dentists seldom report encountering 47, XYY males, probably because there are no overt signs of the disease. The purpose of this report is to present the clinical oro-facial findings of the case of a 47, XYY boy based on cephalometric analysis and study model examinations as well as micro-CT measurement of tooth mineralization. An 11-year-old Japanese boy was referred to our clinic for extraction of primary teeth because of their prolonged retention. He had 47, XYY disorder, pulmonary hypertension, and slight mental retardation. Cephalometric analysis and study model examinations that included a comparison of tooth size and arch assessments were performed. A further attempt was made to demonstrate the degree of dentin mineralization in primary molars. The boy&rsquo;s height and weight were normal but his head circumference had exceeded the 94th percentile since 2 years of age. The cephalometric analysis showed an increase in the lower facial height and bimaxillary protrusion with a longer mandible. Study model examination revealed that the mesio-distal crown widths of all erupted primary and permanent teeth were larger than the standard values, except for the mandibular permanent canines. The degree of dentin mineralization was almost normal in the crown and root areas. A profilogram showed an increase in the lower facial height and bimaxillary protrusion with a longer mandible. The dental arch showed a remarkably contracted width but an extended length. The crown width was larger than the standard values, but the distribution of the degree of dentin mineralization differed little from normal.

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  • Effect of low-gamma irradiation on the impact compressive properties of ultra high molecular weight polyethylene and its constitutive model Reviewed

    Koichi Kobayashi, Makoto Sakamoto, Yuji Tanabe

    Zairyo/Journal of the Society of Materials Science, Japan   57 ( 9 )   882 - 886   2008.9

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    The effects of low-gamma irradiation on the impact compressive properties of ultra high molecular weight polyethylene (UHMWPE) were investigated. Gamma irradiation was performed at 30kGy in nitrogen or at 29kGy in air without post-irradiation treatment. Impact compressive tests using the split-Hopkinson pressure-bar (SHPB) technique were performed to measure stress-strain relations up to a true strain of 8% at a strain rate of 260s-1. Gamma irradiation in air significantly increased the Young's modulus and the 0.5% yield stress, and gamma irradiation in N2 significantly increased the 0.5% yield stress, as determined by impact compressive testing. The impact stress-strain behaviors of both unirradiated and gamma irradiated UHMWPE specimens were compared by the elasto-viscoplastic model proposed by Bergström [Biomaterials Vol.23 p.2329 (2002)]. We found that the elasto-viscoplastic model had a potential to predict the observed impact stress-strain responses. © 2008 The Society of Materials Science.

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  • The elastic contact between a circular rigid punch and a transversely isotropic layer bonded to a rigid foundation Reviewed

    Makoto Sakamoto, Koichi Kobayashi

    Theoretical and Applied Mechanics Japan   56   15 - 28   2008

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    We consider an axisymmetric elastic contact problem of a transversely isotropic layer which is bonded to a rigid foundation. The upper surface of the layer is smoothly indented by a flat-ended circular rigid punch. The problem is reduced to an analytical and exact solution of an infinite system of simultaneous equations utilizing a method of expressing a normal contact stress on the punch as an appropriate series function with a singularity at the punch edge. Convergence can be achieved using 8 terms of the series. Numerical results are obtained to examine the effects of the layer thickness and material anisotropy on stress fields.

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  • Accuracy of 3-D pose estimation of bone using an image matching technique with fluoroscopic images and 3-D bone model. Reviewed

    田中伸明, 小林公一, 田邊裕治, 佐藤卓, 渡辺聡, 古賀良生, 大森豪, 坂本信, 清徳則雄

    日本臨床バイオメカニクス学会誌   28   335 - 339   2007.11

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  • Analysis of Patellofemoral Joint Contact Area Using Magnetic Resonance Imaging. Reviewed

    坂本信, 下田優, 小林公一, 吉田秀義, 田邊裕治

    日本臨床バイオメカニクス学会誌   28   161 - 166   2007.11

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  • Accuracy of three-dimensional surface models of the knee reconstructed from magnetic resonance imaging. Reviewed

    笹川圭右, 渡辺聡, 小林公一, 坂本信, 佐藤卓, 古賀良生

    日本臨床バイオメカニクス学会誌   28   349 - 354   2007.11

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  • Evaluation of CT Slice Effect on Surface Modeling for Three-Dimensional Lower Extremity Alignment Assessment. Reviewed

    山崎芳裕, 坂本信, 小林公一, 田邊裕治, 佐藤卓, 渡辺聡, 古賀良生, 清徳則雄

    日本臨床バイオメカニクス学会誌   28   369 - 373   2007.11

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  • Quantitative 3-dimensional analysis of preoperative and postoperative joint lines in total knee arthroplasty - A new concept for evaluation of component alignment Reviewed

    Takashi Sato, Yoshio Koga, Ten Sobue, Go Omori, Yuji Tanabe, Makoto Sakamoto

    JOURNAL OF ARTHROPLASTY   22 ( 4 )   560 - 568   2007.6

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    We developed a quantitative 3-dimensional (3D) technique for the assessment of changes in the tibial joint line as well as distal and posterior femoral joint lines using a 3D image-matching procedure. In this study, we performed 3D joint line assessment of 20 knees that had undergone total knee arthroplasty. most of the knees exhibited proximal change in the tibial joint line, distal change in the distal femoral joint line, and anterior change in the posterior femoral joint line. There were clear differences in changes in the joint lines between the medial and lateral condyles. The findings indicate that changes in the joint line should be individually assessed for each condyle and that the assessment should include not only the tibial condyle but also the distal and posterior femoral condyles.

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  • The effects of strain rate and low-gamma irradiation on the compressive properties of UHMWPE Reviewed

    Koichi Kobayashi, Toshihiko Kakinoki, Makoto Sakamoto, Yuji Tanabe

    BIO-MEDICAL MATERIALS AND ENGINEERING   17 ( 2 )   87 - 95   2007

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    The effects of strain rate and low-gamma irradiation on the compressive properties of ultra-high molecular-weight polyethylene (UHMWPE) were investigated. Gamma irradiation was performed at 30 kGy in nitrogen or at 29 kGy in air without post-irradiation treatment. Quasi-static and impact compressive tests using the split-Hopkinson pressure-bar technique were performed to measure stress-strain relations up to a true strain of 8% at strain rates of between 0.0004 and 260 s(-1). For both unirradiated and gamma-irradiated UHMWPE specimens, an increase in the strain rate significantly increased the Young's modulus and the 0.5% yield stress. Gamma irradiation in air significantly increased the Young's modulus, as determined by quasi-static and impact compressive testing, and the 0.5% yield stress, as determined by impact compressive testing. The strain-rate dependence in the power-law relationship was similar to that observed for strain rates ranging from 0.02 to 0.10 s(-1) (Kurtz et al., Biomaterials 23, 2002, pp. 3681-3697).

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  • Fluid-structure interaction within a layered aortic arch model Reviewed

    Feng Gao, Zhihong Guo, Makoto Sakamoto, Teruo Matsuzawa

    JOURNAL OF BIOLOGICAL PHYSICS   32 ( 5 )   435 - 454   2006.11

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    The response of wall stress to the elasticity of each layer in the aorta wall was investigated to understand the role of the different elastic properties of layers in the aortic dissection. The complex mechanical interaction between blood flow and wall dynamics in a three-dimensional arch model of an aorta was studied by means of computational coupled fluid-structure interaction analysis. The results show that stresses in the media layer are highest in three layers and that shear stress is concentrated in the media layer near to the adventitia layer. Hence, the difference in the elastic properties of the layers could be responsible for the pathological state in which a tear splits across the tunica media to near to the tunica adventitia and the dissection spreads along the laminar planes of the media layer where it is near the adventitia layer.

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  • The axisymmetric problem of an elastic layer indented by an infinite rigid punch with a circular hole Reviewed

    Sakamoto M, Kobayashi K

    Theoretical and Applied Mechanics   55   61 - 71   2006.10

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  • Measurements of Viscoelastic Properties of Cortical Bone Using Dynamic Nanoindentation. Reviewed

    坂本信, 村田冬樹, 岩田貴之, 甲田文一, 小林公一, 大森豪, 田邊裕治, 原利昭

    日本臨床バイオメカニクス学会誌   27   53 - 59   2006.10

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  • Accuracy of the 3D-pose estimation using fluoroscopic images of total knee arthroplasty. Reviewed

    小林公一, 佐藤卓, 大森豪, 古賀良生, 坂本信, 田邊裕治

    日本臨床バイオメカニクス学会誌   27   225 - 229   2006.10

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  • Quantitative Evaluation of Water Content in Articular Cartilage Using Near Infrared Spectrometer. Reviewed

    濱田一成, 田邊裕治, 菊池達哉, 小林公一, 坂本信, 古賀良生

    日本臨床バイオメカニクス学会誌   27   35 - 38   2006.10

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  • The Gradient of Microhardness in Cross-sectioned Sound Primary Molars

    HAYASHI‐SAKAI Sachiko, SAKAI Jun, SAKAMOTO Makoto, KOUDA Fumikazu, NODA Tadashi

    実験力学   6 ( 1 )   13 - 18   2006.3

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  • Analysis of Tibio-Femoral Joint Kinematics and Contact Area Using MRI Reviewed

    YOSHIDA Hidenori, WATANEBE Keichi, TANABE Yuji, KOBAYASHI Koichi, SAKAMOTO Makoto

    J. JSEM   6 ( 1 )   31 - 35   2006

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    This study analyzed tibio-femoral joint kinematics and contact area during knee flexion at 0&amp;deg;, 30&amp;deg;, 60&amp;deg;, 90&amp;deg; and 135&amp;deg; using magnetic resonance imaging with a 3D-fat-suppressed fast low angle shot sequence (3D-FLASH). At a 200N loading situation, knee flexion angles were chosen to be 0&amp;deg;, 30&amp;deg;and 60&amp;deg;. Sagittal and coronal images were obtained under the loading and unloading situations from 6 healthy male Japanese volunteers. At unloading situation, from 0&amp;deg; to 90&amp;deg; the centroids of the medial and lateral contact areas translated backward and outside. From 90&amp;deg; to 135&amp;deg; the centroids of the medial and lateral contact areas translated backward and inside. The contact areas tended to decrease, but from 60&amp;deg; to 135&amp;deg; knee flexion the medial contact area was not changed generally. At loading situation, almost the same results as observed at unloading situation for each translation were obtained. However, the translation of centroids of the medial and lateral contact areas decreased with an increase of knee flexion, and the centroids moved roughly straight backward as well. The contact areas increased at each knee flexion angle as compared to unloading situation. These results showed good correlation with previous ones found in the other studies of knee kinematics.

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  • Analysis of tibio-femoral joint kinematics and contact area using MRI Reviewed

    H. Yoshida, Y. Tanabe, K. Kobayashi, M. Sakamoto

    PROCEEDINGS OF THE 5TH WORLD CONGRESS OF BIOMECHANICS   6 ( 1 )   139 - +   2006

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    This study analyzed tibio-femoral(TF) joint kinematics and contact area(CA) during knee flexion at 0 degrees, 30 degrees, 60 degrees, 90 degrees and 135 degrees using MRI. At a 200N loading situation, knee flexion angles were chosen to be 0 degrees, 30 degrees and 60 degrees. At unloading situation, from 0 to 90 the centroids of the medial and lateral CAs were translated backward and outside. From 90 degrees to 135 degrees, the centroids of both CAs translated backward and inside. The CAs tended to decrease, but from 60 degrees to 135 degrees knee flexion the medial CA was not changed generally. At loading situation, almost the same results as observed at unloading situation for each translation were obtained. However, the translation of the centroids of both CAs decreased with an increase of knee flexion. The CAs increased at each knee flexion angle as compared to unloading situation.

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  • Analysis of tibio-femoral joint kinematics and contact area using MRI Reviewed

    H. Yoshida, Y. Tanabe, K. Kobayashi, M. Sakamoto

    PROCEEDINGS OF THE 5TH WORLD CONGRESS OF BIOMECHANICS   6 ( 1 )   139 - +   2006

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    This study analyzed tibio-femoral(TF) joint kinematics and contact area(CA) during knee flexion at 0 degrees, 30 degrees, 60 degrees, 90 degrees and 135 degrees using MRI. At a 200N loading situation, knee flexion angles were chosen to be 0 degrees, 30 degrees and 60 degrees. At unloading situation, from 0 to 90 the centroids of the medial and lateral CAs were translated backward and outside. From 90 degrees to 135 degrees, the centroids of both CAs translated backward and inside. The CAs tended to decrease, but from 60 degrees to 135 degrees knee flexion the medial CA was not changed generally. At loading situation, almost the same results as observed at unloading situation for each translation were obtained. However, the translation of the centroids of both CAs decreased with an increase of knee flexion. The CAs increased at each knee flexion angle as compared to unloading situation.

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  • The axisymmetric contact problem of a transversely isotropic layer subjected to a tensile stress applied over a circular region Reviewed

    Sakamoto M, Kobayashi K

    Theoretical and Applied Mechanics   54   3 - 15   2005.10

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    DOI: 10.11345/nctam.54.3

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  • Determination of Mechanical Properties of Articular Cartilage at High Strain Rate Using the Split-Hopkinson Pressure-Bar Technique. Reviewed

    柿木俊彦, 小林公一, 坂本信, 涌井隆, 田辺裕治, 菊池達哉, 大森豪, 古賀良生

    日本臨床バイオメカニクス学会誌   26   65 - 70   2005.10

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  • Radiographic assessment of trabecular structure around total knee arthroplasty. Reviewed

    小林公一, 坂本信, 田辺裕治, 大森豪, 古賀良生

    日本臨床バイオメカニクス学会誌   26   41 - 46   2005.10

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  • Accuracy Verification of a Newly Developed Turntable X-ray System in Three-Dimensional Leg Alignment Assessment System. Reviewed

    山崎芳裕, 小林公一, 坂本信, 田辺裕治, 大森豪, 古賀良生, 佐藤卓, 祖父江展

    日本臨床バイオメカニクス学会誌   26   181 - 186   2005.10

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  • Correlation of Volumetric Bone Mineral Density with Mechanical Properties of Rat Femoral Cortical Bone Using Nanoindentation Reviewed

    SAKAMOTO Makoto, SATO Kenji, TANABE Yuji, MURATA Fuyuki, KOBAYASHI Koichi, SAKAI Jun, HARA Toshiaki, OMORI Go

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   26   35 - 40   2005.10

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  • Contact pressure in anterior cruciate ligament bone tunnels: Comparison of endoscopic and two-incision technique Reviewed

    H Segawa, Y Koga, G Omori, M Sakamoto, T Hara

    ARTHROSCOPY-THE JOURNAL OF ARTHROSCOPIC AND RELATED SURGERY   21 ( 4 )   439 - 444   2005.4

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    Purpose: To investigate differences in contact pressure in the bone tunnel between the inside-out and outside-in techniques used for anterior cruciate ligament reconstruction. Type of Study: In vitro cadaveric analysis. Methods: Four fresh-frozen cadaver knees were tested. A femoral tunnel was generated through the tibial tunnel (inside-out technique). Another femoral tunnel was created using a rear-entry guide at the same intra-articular exit (outside-in technique). Aluminum cylinders containing 4-way (anterior, posterior, medial, and lateral) conductive rubber pressure sensors at the entrance of the joint were inserted into the tibial and femoral tunnels. Dynamic changes in the contact pressure of grafts in the femoral and tibial tunnels during 0 degrees to 130 degrees of knee flexion were measured. Results: Contact pressure of the graft migrated from the anterior to the posterior portion of the femoral tunnel upon alignment of the femoral and tibial tunnels. At 0 degrees, 30 degrees, and 60 degrees of knee flexion, significantly greater contact pressure was observed at the anterior portion of the femoral tunnel made by the inside-out technique compared with that in the tunnel made by the outside-in technique. At 0 degrees, 30 degrees, and 60 degrees of knee flexion, significantly greater contact pressure was observed at the lateral portion of the femoral tunnel made by the outside-in technique. Constant contact pressure was observed in the medial portion of the tunnel made by the inside-out technique. Pressure changes in the tibial tunnel were slight; moreover, changes were not influenced by the femoral tunnel direction under any conditions. Conclusions: This study shows that contact pressure in the femoral tunnel is influenced by the direction of the femoral tunnel. Clinical Relevance: The femoral tunnel direction in anterior cruciate ligament reconstruction is an important factor for femoral tunnel enlargement. A horizontal direction of the femoral tunnel might be needed for mature bone graft incorporation.

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  • Relationships between Mechanical Properties and Volumetric Bone Mineral Density of Rat Femoral Cortical Bone Reviewed

    Sakamoto Makoto, Sato Kenji, Tanabe Yuji, Kobayashi Koichi, Murata Fuyuki, Sakai Jun

    実験力学   5 ( 1 )   40 - 44   2005.3

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    The mechanical properties of cortical bone are a consequence of the interaction between the mineral and collagen components. Small variations in the amount of mineral present in a section of bone can have a large influence on its mechanical properties. Studies have shown the correlations between Vickers microhardness and mineral content, and Vickers microhardness and elastic modulus using three-point and four-point bending tests. However, the precise nature of statistical relationship has yet to be established. Nanoindentation, which evolved from Vickers microhardness test, allows for measurement of mechanical properties of cortical bone at the nanometer scale. The nanoindentation technique has been applied to estimate mechanical properties of bone at a microscopic length scale, overcoming the limitations of traditional mechanical tests for small specimens. In this study, the relationships between mechanical properties measured by nanoindentation and volumetric Bone Mineral Density (vBMD) measured by peripheral Quantitative Computed Tomography (pQCT) in femoral cortical bone from a variety of ages of rats were investigated. The specimen of rat cortical bone used here was Haversian bone. Experimentally measured elastic modulus was correlated with vBMD (r=0.80). It was found that a good correlation also existed between hardness and vBMD (r=0.81).

    DOI: 10.11395/jjsem.5.40

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  • Measurement of Water Content in Articular Cartilage Using Near Infrared Spectroscopy (2nd Report).-Relationship between cartilage degeneration and recovery rate of NIR absorbance for cartilage- Reviewed

    浜田一成, 田辺裕治, 菊池達哉, 小林公一, 坂本信, 古賀良生

    日本臨床バイオメカニクス学会誌   25   103 - 107   2004.11

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  • Experimental Study of a Shape Model by a Three-Dimensional Leg Alignment Analyzing System. Reviewed

    山崎芳裕, 根本篤志, 古賀良生, 田辺裕治, 坂本信, 松沢総仁

    日本臨床バイオメカニクス学会誌   25   291 - 296   2004.11

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  • Nano-Mechanical Properties of Hard Tooth Tissues. Reviewed

    坂井淳, 甲田文一, 坂本信, 小林公一, 原利昭, 伊藤秀美, 長谷川裕司, 黒江敏史, 大畑昇

    日本臨床バイオメカニクス学会誌   25   229 - 233   2004.11

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  • Biomechanical Evaluation of Anterior Cruciate Ligament by Tensile and Tensile-Torsional Tests. Reviewed

    高柳津富, 小林公一, 坂本信, 田辺裕治, 瀬川博之, 大森豪, 古賀良生

    日本臨床バイオメカニクス学会誌   25   167 - 171   2004.11

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  • Relationship between 3D structural and torsional properties of bovine trabecular bone. Reviewed

    小林公一, 海藤隆紀, 山田麻由, 坂本信, 田辺裕治, 原利昭

    日本臨床バイオメカニクス学会誌   25   1 - 6   2004.11

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  • Measurements of Elastic Modulus and Hardness of Bovine Vertebral Shell Using Nanoindentation. Reviewed

    坂本信, 村田冬樹, 小林公一, 佐藤憲二, 坂井淳, 田辺裕治, 原利昭, 大森豪

    日本臨床バイオメカニクス学会誌   25   19 - 24   2004.11

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  • The axisymmetric contact problem of an elastic layer subjected to a tensile stress applied over a circular region Reviewed

    Sakamoto M, Kobayashi K

    Theoretical and Applied Mechanics   53   27 - 36   2004.10

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    DOI: 10.11345/nctam.53.27

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  • The effect of an ankle brace on the 3-dimensional kinematics and tibio-talar contact condition for lateral ankle sprains Reviewed

    G Omori, K Kawakami, M Sakamoto, T Hara, Y Koga

    KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY   12 ( 5 )   457 - 462   2004.9

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    Ten fresh-frozen cadaveric ankles were studied to investigate the effect of an ankle brace (Air-Stirrup) on the three-dimensional (3-D) motion and contact-pressure distribution of the talo-tibial joint with lateral ligamentous injury. Three-dimensional motion and contact-pressure distribution were simultaneously measured under dynamic conditions employing a direct linear-transformation technique and a dynamic-pressure sensor, respectively. Inversion increased significantly upon severing of the anterior talofibular (ATF) ligament and calcaneo-fibular (CF) ligaments; however, restoration to the intact level was observed following application of the ankle brace. Internal rotation also increased upon severing of the lateral ligaments in the plantar flexion; however, this difference was not altered by using the ankle brace. The contact area on the articular surface of the talus shifted from posterior to anterior between plantar flexion and dorsal flexion; additionally, a high pressure area was evident in the medial aspect of the talus following severing of the lateral ligaments. Upon application of the ankle brace, however, no significant changes were apparent in the contact condition. The results of this study suggest that stabilization against inversion is the major function of braces in terms of protection of ankle sprains. Ankle sprains, however, often occur in combinations of inversion, plantar flexion and internal rotation; therefore, restriction of plantar flexion and internal rotation may also be an important function of the ankle brace.

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  • Mechanical Properties of Ultra High Molecular Weight Polyethylene under Impact Compression : Property Change with Gamma Irradiation and Dynamic Stress-Strain Analysis of Artificial Hip Joint Reviewed

    Kobayashi Koichi, Kakinoki Toshihiko, Tanabe Yuji, Sakamoto Makoto

    実験力学   3 ( 4 )   225 - 229   2003.12

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    Mechanical properties of ultra high molecular weight polyethylene (UHMWPE) used as a bearing material in total joint replacement system have been investigated under impact compressive load. Ten cylindrical specimens, 8mm in both diameter and length, were machined from compression molded UHMWPE rods. Half of these specimens were gamma-irradiated in air at a dose of 2.9 Mrad without post irradiation treatment. Impact compression tests were performed using the split-Hopkinson pressure-bar technique to evaluate dynamic stress-strain relation up to 8% strain at a strain rate of about 400s-1. For both gamma-irradiated and unirradiated specimens, stress-strain relations exhibited relatively linear portions up to 2% strains and the gradients eventually decreased with increasing strain. Young&#039;s modulus determined from the linear portion and 0.5% yield stress were significantly higher for gamma-irradiated specimens than for unirradiated specimens. Two-dimensional elasto-plastic stress and strain analysis of hip prosthesis was performed under impact loading using a finite element method. Results indicated that the increase in mechanical properties induced by gamma irradiation reduced plastic strain within the UHMWPE cup.

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  • 超高分子量ポリエチレンの衝撃圧縮特性―ガンマ線照射による特性変化と人工股関節における動的応力・ひずみ解析― Reviewed

    小林公一, 柿木俊彦, 田辺裕治, 坂本信

    実験力学   3 ( 4 )   225 - 229   2003.12

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  • Measurement of Water Content in Articular Cartilage Using Near Infrared Spectroscopy. Reviewed

    浜田一成, 田辺裕治, 坂本信, 大森豪, 古賀良生, 菊池達哉

    日本臨床バイオメカニクス学会誌   24   33 - 37   2003.11

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  • Accuracy Verification of Three-Dimensional Leg Alignment Assessment System Using Computed Radiography. Reviewed

    田辺裕治, 山崎芳裕, 坂本信, 古賀良生, 西野勝敏

    日本臨床バイオメカニクス学会誌   24   171 - 176   2003.11

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  • Measurements of Mechanical Properties of Cortical Bone Using Nanoindentation Tests Reviewed

    SAKAMOTO Makoto, SATO Kenji, KOBAYASHI Koichi, SAKAI Jun, TAKANO Eisuke, HARA Toshiaki

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   24   1 - 5   2003.11

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  • Evaluation of Microhardness of Permanent and Primary Tooth. Reviewed

    坂井淳, 甲田文一, 坂本信, 小林公一, 丸山康夫, 伊藤秀美, 原利昭

    日本臨床バイオメカニクス学会誌   24   133 - 137   2003.11

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  • Evaluation of Tibial Clinical Parameters by Three-Dimensional Leg Alignment Analysis System. Reviewed

    山崎芳裕, 大川慶樹, 田辺裕治, 坂本信, 栢森亮, 古賀良生, 佐藤卓

    日本臨床バイオメカニクス学会誌   24   177 - 184   2003.11

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  • Influence of the femoral tunnel location and angle on the contact pressure in the femoral tunnel in anterior cruciate ligament reconstruction Reviewed

    H Segawa, Y Koga, G Omori, M Sakamoto, T Hara

    AMERICAN JOURNAL OF SPORTS MEDICINE   31 ( 3 )   444 - 448   2003.5

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    Background: The causes of bone tunnel enlargement after anterior cruciate ligament reconstruction have not been thoroughly investigated.
    Hypothesis: A malpositioned femoral tunnel and an acute femoral tunnel angle may increase the mechanical stress in the femoral tunnel.
    Study Design: Controlled laboratory study. Methods: Three femoral tunnels (normal, anterior, and acute) and the tibial tunnel were made in four fresh-frozen cadaveric knees. Aluminum cylinders containing pressure-sensitive conductive rubber sensors at the joint entrance were inserted into the femoral tunnels. Dynamic changes in the contact pressure of the graft in the femoral tunnel were measured.
    Results: Peak contact pressures and dynamic changes in contact pressure for the normal and anterior femoral tunnels demonstrated no differences. Maximum contact pressure of the graft was observed at the anterior portion with the knee in full extension and at the posterior portion with deep knee flexion. Consistent contact pressure occurred at the anterior aspect of the acute femoral tunnel throughout the range of motion. Mean contact pressure at the anterior region of the acute femoral tunnel was significantly higher than that of the normal femoral tunnel at 60degrees, 90degrees, and 120degrees of knee flexion.
    Conclusions: The consistent contact pressure in the anterior aspect of the acute femoral tunnel may erode the anterior portion of the femoral tunnel, resulting in bone tunnel enlargement.
    Clinical Relevance: The femoral tunnel direction in anterior cruciate ligament reconstruction is an important factor in reducing femoral tunnel enlargement. (C) 2003 American Orthopaedic Society for Sports Medicine.

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  • An elastic layer with a penny-shaped crack subjected to internal pressure Reviewed

    M Sakamoto

    JSME INTERNATIONAL JOURNAL SERIES A-SOLID MECHANICS AND MATERIAL ENGINEERING   46 ( 1 )   10 - 14   2003.1

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    This study examines the axisymmeteric problem on an elastic layer with a penny-shaped crack situated in its middle plane. The crack surfaces are subjected to uniform pressures. The layer surfaces are free from stresses for case I while smooth-clamp conditions are prescribed on the layer surfaces for case II. By assuming series expansions for the normal displacement on the crack surfaces, both cases are reduced to analytical and exact solutions through infinite system of simultaneous equations. An expression for the stress intensity factor at the penny-shaped crack is evaluated in a simple form of a series which involves coefficients of the solutions of the simultaneous equations. Numerical results are obtained to examine the effects of the layer thickness and boundary conditions of the layer surfaces. on norma I stress and displacement distributions and on the stress intensity factors.

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  • Mechanical Properties of Ultra High Molecular Weight Polyethylene under Impact Compression Reviewed

    KOBAYASHI Koichi, KAKINOKI Toshihiko, TANABE Yuji, SAKAMOTO Makoto

    J. JSEM   3 ( 4 )   225 - 229   2003

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    Mechanical properties of ultra high molecular weight polyethylene (UHMWPE) used as a bearing material in total joint replacement system have been investigated under impact compressive load. Ten cylindrical specimens, 8mm in both diameter and length, were machined from compression molded UHMWPE rods. Half of these specimens were gamma-irradiated in air at a dose of 2.9 Mrad without post irradiation treatment. Impact compression tests were performed using the split-Hopkinson pressure-bar technique to evaluate dynamic stress-strain relation up to 8% strain at a strain rate of about 400s-1. For both gamma-irradiated and unirradiated specimens, stress-strain relations exhibited relatively linear portions up to 2% strains and the gradients eventually decreased with increasing strain. Young&#039;s modulus determined from the linear portion and 0.5% yield stress were significantly higher for gamma-irradiated specimens than for unirradiated specimens. Two-dimensional elasto-plastic stress and strain analysis of hip prosthesis was performed under impact loading using a finite element method. Results indicated that the increase in mechanical properties induced by gamma irradiation reduced plastic strain within the UHMWPE cup.

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  • Biomechanical comparison of contact pressure of the anterior cruciate ligament graft in the bone tunnel in single- and two-incision techniques Reviewed

    SEGAWA Hiroyuki, KAWAKAMI Kensaku, KOGA Yoshio, HARA Toshiaki, SAKAMOTO Makoto

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   23   215 - 220   2002.11

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  • Estimation of Torsional Properties of Rat Femoral Bone Using pQCT Reviewed

    SAKAMOTO Makoto, SATO Kenji, TAKANO Eisuke, UCHIHASHI Satoru, SAKAI Jun, ENDO Naoto, HARA Toshiaki

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   23   71 - 76   2002.11

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  • The Evaluation of Regional Material Properties of Degraded Tibial Plate Reviewed

    HARA Kazuhiro, SAKAMOTO Makoto, HARA Toshiaki, OMORI Go, ENDO Naoto

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   23   393 - 398   2002.11

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  • Evaluation of Clinical Parameters for Three-Dimensional Leg Alignment Analyzing System Reviewed

    YAMAZAKI Yoshihiro, TERAJIMA Kazuhiro, TANABE Yuji, SAKAMOTO Makoto, OMORI Go, NISHINO Katsutoshi, KOGA Yoshio

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   23   251 - 258   2002.11

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  • The Evaluation of Mechanical Property of Enamel Using an Indentation Microfracture Method Reviewed

    SAKAI Jun, SAKAMOTO Makoto, KOUDA Fumikazu, MORIKAWA Hidehiro, ITOH Hidemi, HARA Toshiaki

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   23   221 - 226   2002.11

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  • 野球投球時爪損傷のメカニズムの検討 Reviewed

    瀬川 博之, 大森 豪, 古賀 良生, 丸橋 洋一, 坂井 淳, 坂本 信

    臨床スポーツ医学 = The journal of clinical sports medicine   19 ( 1 )   71 - 74   2002.1

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  • Changes in 3-D Motion and Contact Pressure Distribution after Lateral Ligament Injury of the Ankle Joint Reviewed

    Kensaku KAWAKAMI, Go OHMORI, Shojiro TERASHIMA, Makoto SAKAMOTO, Toshiaki HARA

    Proceedings of 4th World Congress of Biomechanics   in CD   2002

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  • Dynamic evaluation of the contact characteristics and three-dimensional motion for the ankle joint with lateral ligament injuries Reviewed

    K Kawakami, G Omori, S Terashima, M Sakamoto, T Hara

    JSME INTERNATIONAL JOURNAL SERIES C-MECHANICAL SYSTEMS MACHINE ELEMENTS AND MANUFACTURING   44 ( 4 )   1082 - 1088   2001.12

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    The purpose of this study was to clarify the dynamic changes in contact pressure distribution and three-dimensional ankle joint motion before and after lateral ligament injuries. Five fresh and frozen intact cadaveric ankles were examined. Each ankle was mounted on a specially designed frame that preserved five degrees of freedom motion. The direct linear transformation technique was used to measure the three dimensional ankle motion, and a pressure-sensitive conductive rubber sensor was inserted into the talocrural joint space to determine the contact pressure distribution. The contact area on the talus for intact ankle moved anteriorly and laterally with increasing dorsiflexion. An area of high pressure was observed in the medial aspect of the articular surface after the ligament was cut. Supination significantly increased after a combined anterior talofibular ligament (ATF) and calcaneofibular ligament (CF) were cut in comparison with after only an ATF was Cut, and no significant differences were observed in motional properties tinder each experimental condition.

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  • Mechanism of Fingernail Injury in Baseball Reviewed

    SEGAWA Hiroyuki, OMORI Go, KOGA Yoshio, SAKAMOTO Makoto, SAKAI Jun, MARUHASHI Youichi

    日本整形外科スポーツ医学会雑誌 = Japanese journal of orthopaedic sports medicine   21 ( 4 )   52 - 56   2001.12

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  • An experimental study on the contact pressure in bone tunnel with anterior cruciate ligament reconstruction Reviewed

    22   337 - 358   2001.10

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  • Prediction of elastic modulus of cortical bone using microhardness testing Reviewed

    Sakamoto M, Sakai J, Ikarashi H

    Theoretical and Applied Mechanics   51   97 - 101   2001.10

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  • Numerical Analysis of Contact Pressure on Talocrural Joint Reviewed

    SAKAI Jun

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   22   353 - 357   2001.10

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  • Estimation of Local Elastic Modulus of Hard Tissues Using Microhardness Reviewed

    SAKAMOTO Makoto

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   22   51 - 57   2001.10

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  • Evaluation of Contact Pressure on the Bone Tunnel Surface under Anterior Cruciate Ligament Reconstruction Reviewed

    YAMADA Mitsuru

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   22   337 - 342   2001.10

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  • Strength Criterion for Bovine Tibial Trabecular Bone under Multiaxial Stress Reviewed

    KOBAYASHI Koichi, SAKAI Jun, SAKAMOTO Makoto

    Theoretical and Applied mechanics   50   91 - 96   2001.10

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  • Impact Response Analysis of Patella-Patellar Tendon-Tibial Tuberosity Complex(Impact 2)

    TANABE Yuji, SAKAMOTO Makoto, SHIBATA Hiroshi, KOGA Yoshio

    Proceedings of the Asian Pacific Conference on Fracture and Strength and International Conference on Advanced Technology in Experimental Mechanics   1   493 - 498   2001

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    This paper deals with the attenuation of impact load through patella-patellar tendon-tibial tuberosity (PTT) complex with respect to the progress of ossification of growing cartilage in tibial tuberosity. Materials used in this study were PTT complexes and patellar tendons taken from porcine hind legs with three different stages of ossification of tibial tuberosity. Their stages of ossification were represented by body weight (20, 100, and 200kgf). Impact tensile tests on PTT complexes and patellar tendons were performed at room temperature using the split-Hopkinson pressure bar technique. In both tests on PTT and patellar tendons, pretensile loads were applied to them just before an application of impact load. The experimental load transmission ratio of PTT complexes increased with an increase of pretension, independent of body weight. Larger body weight, or highly ossified PTT complex appeared to show lower load transmission ratio. Significant change in Young's modulus of patellar tendon with an increase of pretension as well as the progress of ossification of growing cartilage in tibial tuberosity was not found. Impact response analyses were also performed for the prediction of load transmission ratio as well as the section subjected to maximum strain in PTT complexes with different stages of ossification based on the one-dimensional wave propagation theory. The results obtained from the dynamic analyses well corresponded to the location of injuries in different stages of growing process, while static analyses could not predict such clinical situation.

    DOI: 10.1299/jsmeatemapcfs.1.01.203.0_493

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  • Evaluation of Microhardness and Bending Strength of Cortical Bone(Mechanical Behavior of Materials 1)

    SAKAI Jun, SAKAMOTO Makoto, HARA Toshiaki

    Proceedings of the Asian Pacific Conference on Fracture and Strength and International Conference on Advanced Technology in Experimental Mechanics   2   884 - 887   2001

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    The Vickers microhardness, elastic modulus, bending strength and mineral density of ninety cortical bone specimens from ten bovine femora were determined. The relationship between Vickers microhardness number and elastic modulus was found to be approximately linear. Similar relationship existed between Vickers microhardness and bending strength. The bone mineral density of the plexiform bone was also correlated with microhardness. These relationships found suggest that Vickers microhardness was a good predictor of the elastic modulus, bending strength and mineral density of cortical bone.

    DOI: 10.1299/jsmeatemapcfs.2.01.03.0_884

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  • Impact Response Analysis of Patella-Patellar Tendon-Tibial Tuberosity Complex : The 2nd Report Reviewed

    TANABE Yuji

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   21   143 - 150   2000.10

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  • Numerical Analysis of Contact Pressure on Total Knee Prosthesis Using Rigid-Body-Spring-Model Method Reviewed

    SOFUKU Yu

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   21   235 - 242   2000.10

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  • Ultrasonic Analysis of Mechanical Properties of Human Hard Tooth Tissues Reviewed

    SAKAMOTO Makoto

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   21   433 - 438   2000.10

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  • An evaluation of mechanical properties of whole bone using pQCT Reviewed

    TAKAHASHI Hiroshi

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   21   409 - 414   2000.10

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  • The Relationship Between Microhardness and Mechanical Tensile Property of Cortical Bone Reviewed

    TAKANO Kimihiko

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   21   401 - 408   2000.10

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  • An experimental study on the three dimensional kinematics and dynamic contact characteristics of the talocrural joint Reviewed

    KAWAKAMI Kensaku

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   21   279 - 286   2000.10

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  • MECHANISM OF NAIL INJURY IN BASEBALL Reviewed

    SEGAWA HIROYUKI, OMORI GO, KOGA YOSHIO, SAKAMOTO MAKOTO, SAKAI JUN, MARUHASI YOUICHI

    日本整形外科スポーツ医学会雑誌 = Japanese journal of orthopaedic sports medicine   20 ( 2 )   164 - 164   2000.4

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  • Axisymmetric indentation of a transversely isotropic layer by a concave rigid punch Reviewed

    Sakamoto M, Zhu QF

    Theoretical and Applied Mechanics   49   57 - 67   2000

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  • The Effect of Removal of the Bone Oil Inside the Cortex on the Mechanical Strength of the Cement-Bone Interface Reviewed

    TERASHIMA Shojiro

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   20   245 - 248   1999.10

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  • The Relationships Between Microhardness and Mechanical Bending Properties of Cortical Bone Reviewed

    SAKAMOTO Makoto

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   20   231 - 236   1999.10

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  • Numerical Analysis of Contact Pressure on Hip Prosthesis Using Rigid-Body-Spring-Model Method Reviewed

    SOFUKU Yu

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   20   77 - 82   1999.10

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  • Impact response analysis of patella-patellar tendon-tibial tuberosity complex Reviewed

    IKENORI Masaya

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   20   423 - 428   1999.10

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  • The axisymmetric problem of a transversely isotropic layer with a Penny-shaped crack subjected to pressure Reviewed

    Sakamoto M, Kuribayashi T, HaraT, Shibuya T

    Theoretical and Applied Mechanics   48   49 - 59   1999

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  • Development of a physiological knee motion simulator Reviewed

    K Kiguchi, T Fukuda, Y Koga, T Watanabe, K Terajima, T Hayashi, M Sakamoto, M Matsueda, Y Suzuki, H Segawa

    ADVANCED ROBOTICS   13 ( 2 )   171 - 188   1999

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    Several kinds of knee motion simulator systems have been developed for the accurate analysis of knee biomechanics. Knee motion simulators, however, are not recognized For their practical use because of difficulties in design and control. Tn this study, a wire-driven knee simulator which generates physiological knee motion has been developed. Physiological three-dimensional tibia motion against the femur can be generated by the simulator. Many clinical studies have been performed to analyze the length displacement pattern of the anterior cruciate ligament (ACL) and the posterior cruciate ligament (PCL). We assume that the physiological knee motion can be realized if the length displacement patterns of the ACL and PCL against the knee flexion angle are the same as the experimental data obtained from the literature. A fuzzy neural control policy, one of the most effective intelligent control policies, has been applied for control of the simulator. Applying the fuzzy neural control policy, human knowledge and experience can be reflected and adaptive/learning ability can be incorporated in the controller. On-line learning of the fuzzy neural controller is carried our to minimize a fuzzy controlled evaluation function using the back-propagation learning algorithm. The effectiveness of the proposed simulator has been evaluated by experiments using a model bone.

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  • A Penny-shaped crack expanded by a disc-shaped rigid inclusion in a transversely isotropic layer Reviewed

    Sakamoto M, Ishizuka T, Hara T, Shnibuya T

    Theoretical and Applied Mechanics   47   103 - 114   1998.10

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  • Contact Characteristics in the Human ankle Reviewed

    Kensaku KAWAKAMI, Satoru FUKUSHIMA, Makoto SAKAMOTO, Shojiro TERASHIMA, Go OHMORI, Toshiaki HARA

    Proceedings of Third World Congress of Biomechnics   278-B   1998

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  • Spherical indentation of an elastic layer overlaid on a rigid foundation with a circular hole Reviewed

    Sakamoto M, Zhu QF, Hara T, Shibuya T

    Theoretical and Applied Mechanics   46   189 - 196   1997.10

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  • Evaluation of Elastic Property of Bovine Trabecular Bone Specimen by Ultrasonic Reviewed

    SAKAMOTO Makoto

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   18   247 - 252   1997.10

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  • Elastic Property of Bovine Vertebral Shell Reviewed

    SUGIURA Tohru

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   18   189 - 194   1997.10

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  • A comparison of different methods in predicting static pressure distribution in articulating joints Reviewed

    GA Li, M Sakamoto, EYS Chao

    JOURNAL OF BIOMECHANICS   30 ( 6 )   635 - 638   1997.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    Pressure distribution along the contact surface of an articulating joint model was analyzed using different numerical and analytical methods: a discrete rigid element method [rigid-body-spring-model (RBSM)], the finite element method (FEM), a simplified elasticity solution (SES) and the modified Hertzian (MH) theory. The FEM and MH methods modeled joints interposed with elastic layers, while the RBSM and SES methods assumed a simplified joint with a rigid convex indenter on an elastic concave surface. Results for an axisymmetric joint model indicate that all of these methods predict similar pressure distributions on joint surfaces. In non-axisymmetric deformation mode, the RBSM method and FEM calculation showed good agreement in contact pressure prediction. Compared to the other three methods, the RBSM is relatively simple and effective in predicting joint contact pressure under symmetric and non-symmetric loading. The computational efficiency of the RBSM method is particularly attractive for pre-operative planning of reconstructive surgical procedures in orthopaedics in which geometric changes dictate the eventual outcome of the surgery. (C) 1997 Elsevier Science Ltd.

    DOI: 10.1016/S0021-9290(97)00009-2

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  • Axisymmetric indentation of a transversely isotropic layer by a rigid sphere Reviewed

    Sakamoto M, Zhu QF, Hara T, Shibuya T

    heoretical and Applied Mechanics   45   39 - 49   1996.10

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  • Measurement of Mechanical Properties of Trabecular Bone by Compressive Test and Ultrasonic Technique Reviewed

    SAKAMOTO Makoto

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   17   319 - 323   1996.10

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  • A new method for theoretical analysis of static indentation test Reviewed

    M Sakamoto, GA Li, T Hara, EYS Chao

    JOURNAL OF BIOMECHANICS   29 ( 5 )   679 - 685   1996.5

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    A new mathematical method was developed to study the indentation problem of an infinite elastic layer overlaid on a rigid foundation. Rigid, flat-ended cylindrical or spherical indenters are pressed onto the upper surface of the elastic layer causing a small deformation mode. Shear stresses between the indenter and the layer are assumed negligible and the layer is assumed to be either bonded or unbonded to the rigid foundation. The problem is equivalent to a mixed boundary-value problem of the theory of elasticity. Instead of using the Fredholm integral equation reported in the literature, the new approach obtained closed-form solutions through an infinite series. Convergence can be achieved using less than 10 terms of the series.

    DOI: 10.1016/0021-9290(95)00120-4

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  • An axisymmetric contact problem of rigid spheres coated with transversely isotropic Layers Reviewed

    Sakamoto M, Zhu QF, Hara T, Shibuya T

    Theoretical and Applied Mechanics   44   51 - 59   1995.10

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  • A Mathematical Model of Joint Contact Reviewed

    SAKAMOTO Makoto, ZHU Qian-Fu, CHAO Edmund Y. S

    日本臨床バイオメカニクス学会誌 = Proceedings of ... Annual Meeting of Japanese Society for Clinical Biomechanics and Related Research   16   193 - 198   1995.10

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  • IDENTIFICATION OF THE DYNAMIC PROPERTIES OF BONE USING THE SPLIT-HOPKINSON PRESSURE-BAR TECHNIQUE Reviewed

    Y TANABE, K KOBAYASHI, M SAKAMOTO, T HARA, H TAKAHASHI

    BIOMATERIALS MECHANICAL PROPERTIES   1173   127 - 141   1994

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  • AN ASYMMETRIC CONTACT PROBLEM OF A TRANSVERSELY ISOTROPIC LAYER SUBJECTED TO MOMENT BY AN ANNULAR RIGID PUNCH Reviewed

    M SAKAMOTO, QF ZHU, T HARA, T SHIBUYA, T KOIZUMI

    THEORETICAL AND APPLIED MECHANICS, VOL 42   42   95 - 106   1993

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  • Axisymmetric Contact Problems for Two Rigid Spheres Coated with Elastic Layers. Reviewed

    Sakamoto Makoto, Hara Toshiaki, Shibuya Toshikazu, Koizumi Takashi

    Transactions of the JSME (in Japanese)   59 ( 560 )   963 - 969   1993

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    This paper presents analytical solutions to axisymmetric contact problems of two rigid spheres coated with elastic layers. The elastic layer is assumed to be either bonded or unbonded to the rigid sphere. In the analysis, dual integral equations are reduced to infinite systems of simultaneous equations using the technique of expanding the normal contact stress to an infinite series. Numerical calculations are performed for several values of the layer thickness and for several values of Poisson&#039;s ratio. These effects on the stress distribution and the external load are discussed.

    DOI: 10.1299/kikaia.59.963

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  • INDENTATION BY A CIRCULAR RIGID PUNCH OF A TRANSVERSELY ISOTROPIC LAYER ON A RIGID FOUNDATION Reviewed

    M SAKAMOTO, T HARA, T SHIBUYA, T KOIZUMI

    JSME INTERNATIONAL JOURNAL SERIES I-SOLID MECHANICS STRENGTH OF MATERIALS   34 ( 2 )   130 - 134   1991.4

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    We consider an axisymmetric contact problem of a transversely isotropic layer indented by a circular rigid punch, with the elastic layer resting on a rigid foundation. This problem is equivalent to a mixed boundary-value problem in which the displacement is prescribed within the contact region of the punch and surface stresses are zero outside of the contact region. The problem is reduced to an infinite simultaneous equation using the technique of expressing the normal stress under the punch as an appropriate series. Numerical results are obtained with the indication of the effect material anisotropy and layer thickness on the stress fields in comparison with those for the isotropic material.

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  • AXISYMMETRICAL STRESS-DISTRIBUTION IN AN ELASTIC LAYER ON A RIGID FOUNDATION WITH AN ANNULAR HOLE (CONTACT STRESS MEASUREMENT BY ULTRASONIC-WAVES) Reviewed

    M SAKAMOTO, T HARA, Y ISHIKAWA, T SHIBUYA, T KOIZUMI

    THEORETICAL AND APPLIED MECHANICS, VOL 40   40   109 - 117   1991

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  • An Asymmetric Contact Problem of a Transversely Isotropic Layer Subjected to Moment by a Circular Rigid Punch. Reviewed

    SAKAMOTO Makoto, HARA Toshiaki, SHIBUYA Toshikazu, KOIZUMI Takashi

    Transactions of the JSME (in Japanese)   57 ( 544 )   3016 - 3022   1991

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    An analytical solution is presented for an asymmetric contact problem of a transversely isotropic layer subjected to moment by a circular rigid punch, with the layer resting on a rigid foundation. In the analysis, dual integral equations are reduced to an infinite system of simultaneous equations by using the technique of expressing the normal stress under the punch as an an appropriate series. Numerical results for the contact stress and the surface displacement in three examples of transversely isotropic materials as well as in an isotropic one are presented. The effects of anisotropy and layer thickness on the stress field are discussed.

    DOI: 10.1299/kikaia.57.3016

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  • Determination of a viscoelastic model of bone

    Yuji Tanabe, Shigeo Tanaka, Makoto Sakamoto, Toshiaki Hara

    Theoretical and Applied Mechanics   40   259 - 266   1991

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    This paper deals with the problem of stress wave propagation in a split-Hopkinson pressure-bar (SHPB) with a viscoelastic specimen for the purpose of applying the analysis to the determination of the viscoelastic law of bone. Analyses are done by Laplace transformation and its numerical inversion by the use of the FFT algorithm. The SHPB test with a specimen of bovine femoral compact bone is described. In addition, assuming that the three-element standard linear solid model can be applied to the bone, transmitter stress wave profiles to be observed are analyzed. The theoretical and experimental results obtained are confirmed to be in good agreement.

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  • INDENTATION OF A PENNY-SHAPED CRACK BY A DISK-SHAPED RIGID INCLUSION IN AN ELASTIC LAYER Reviewed

    M SAKAMOTO, T HARA, T SHIBUYA, T KOIZUMI

    JSME INTERNATIONAL JOURNAL SERIES I-SOLID MECHANICS STRENGTH OF MATERIALS   33 ( 4 )   425 - 430   1990.10

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  • Torsion of two dissimilar elastic layers on a rigid foundation with an annular hole. Reviewed

    SAKAMOTO Makoto, HARA Toshiaki, SHIBUYA Toshikazu, KOIZUMI Takashi

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C   55 ( 510 )   280 - 284   1989

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    A solution is presented for a doubly axisymmetric contact problem of the torsion in two dissimilar elastic layers by an annular rigid punch attached to its surface. The problem is solved under the assumptions that the layers are bonded together, and the other face of the layers is clamped to a rigid foundation weakened by an annular hole which is coaxial to the punch and of the same radius. The problem is reduced to infinite systems of simultaneous equations in which both the displacement on the lower face of the layers and the contact stress under the punch are expressed as an appropriate series. The disturbances due to the presence of the hole are shown in the curves calculated numerically, and the effects of various parameters on the stress field are studied.

    DOI: 10.1299/kikaia.55.280

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  • Indentation of a penny-shaped crack by a disc-shaped rigid inclusion in an infinite elastic solid. Reviewed

    HRA Toshiaki, SAKAMOTO Makoto, SHIBUYA Toshikazu, KOIZUMI Takashi

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C   55 ( 513 )   1215 - 1218   1989

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    A solution is presented to a three-part mixed boundary-value problem for an infinite elastic solid containing a penny-shaped crack indented by a disc-shaped rigid inclusion. The problem is reduced to a solution of infinite systems of simultaneous equations in which the normal displacement on the crack surface is expressed as appropriate series. Numerical results are given for the contact stress and the stress intensity factor at the crack tip. The effect of the inclusion on the stress field is studied.

    DOI: 10.1299/kikaia.55.1215

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  • Indentation of a penny-shaped crack by a disc-shaped rigid inclusion in an elastic layer. Reviewed

    SAKAMOTO Makoto, HARA Toshiaki, SHIBUYA Toshikazu, KOIZUMI Takashi

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C   55 ( 512 )   942 - 947   1989

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    An axisymmetric contact problem is considered to be the cause of the indentation of a penny shaped crack by a thin disc-shaped rigid inclusion in an elastic layer. This three-part mixed boundary value problem is reduced to a solution of infinite systems of simultaneous equations in which the crack shape function is expressed as an appropriate series. The normal contact stress between the inclusion and the crack surface, as well as the stress intensity factor, are shown in curves calculated numerically. The effects of various values of nondimensional parameters on the stress field and the stress intensity factors are studied.

    DOI: 10.1299/kikaia.55.942

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  • An axisymmetric contact problem of a transversely isotropic layer indented by an annular rigid punch Reviewed

    Sakamoto M, Hara T, Shibuya T, Koizumi T

    JSME International Journal Series I   55 ( 1 )   1215 - 1218   1989

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  • An axisymmetric contact problem of a transversely isotropic layer indented by an annular rigid punch. Reviewed

    HARA Toshiaki, SAKAMOTO Makoto, SHIBUYA Toshikazu, KOIZUMI Takashi

    Transactions of the JSME (in Japanese)   54 ( 501 )   983 - 991   1988

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    A solution is given for the frictionless indentation of a transversely isotropic layer by an annular rigid punch, where the elastic layer is resting on a rigid foundation. The problem is reduced to an infinite system of simultaneous equations using the method of expressing the normal stress under the punch as appropriate series. The effect of transverse isotropy and indentational load on the stress field are studied. Results are compared with numerical solutions for the corresponding isotropic problem.

    DOI: 10.1299/kikaia.54.983

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  • TORSION OF AN ELASTIC LAYER ON A RIGID FOUNDATION WITH AN ANNULAR HOLE Reviewed

    T HARA, M SAKAMOTO, T SHIBUYA, T KOIZUMI

    BULLETIN OF THE JSME-JAPAN SOCIETY OF MECHANICAL ENGINEERS   29 ( 256 )   3268 - 3274   1986.10

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  • Torsion of an elastic layer on a rigid foundation with an annular hole. Reviewed

    HARA Toshiaki, SAKAMOTO Makoto, SHIBUYA Toshikazu, KOIZUMI Takashi

    Transactions of the JSME (in Japanese)   52 ( 474 )   299 - 307   1986

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    環状孔を有する剛体床上に密着して置かれた弾性厚板の表面を円環状剛体パンチでねじる問題は二つの混合境界値問題を解くことに相当し,解析は極めて複雑になる.本研究では,厚板表面の応力と下面の変位を共に級数表示すれば,この問題は簡単が無限連立一次方程式を解く問題に帰着され,解法が簡略化されることを示した.数値計算を行って,孔のない場合の結果と比較するとともに応力場に及ぼす孔や厚板の影響等を明らかにした.

    DOI: 10.1299/kikaia.52.299

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  • 人体の力学 : 基礎から学ぶバイオメカニクス

    松井, 剛一, 照井, 直人, 岡本, 覚, 横山, 隆, 田邊, 裕治, 坂本, 信, 千葉, 美麗, 小林, 公一

    コロナ社  2020  ( ISBN:9784339072464

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    Total pages:viii, 229p   Language:Japanese

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  • リアル大学ブランドデザイン論 : ぶれない広報で経営を強くする

    吉田, 健一(個性が光る6大学のブランディング-新潟大学)

    日経BPマーケティング  2019  ( ISBN:9784864431330

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    Total pages:237p   Language:Japanese

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  • 動的粘弾性チャートの解釈事例集

    坂本 信, 技術情報協会( Role: Contributor ,  生体硬組織の動的粘弾性測定事例)

    技術情報協会  2016.1  ( ISBN:4861046084

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    Total pages:399  

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  • Hydrated Materials: Applications in Biomedicine and the Environment

    SAKAMOTO Makoto( Role: Contributor ,  Articular Cartilage)

    Pan Stanford Publishing  2015.5  ( ISBN:9789814463225

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  • 新しい骨形態計測

    坂本 信, 遠藤 直人, 山本 智章( Role: Contributor ,  骨の材料試験)

    ウイネット  2014.5  ( ISBN:4434190806

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  • よくわかる実験技術・学術用語 第2版

    坂本信( Role: Contributor ,  MRIによるヒト関節接触領域の測定)

    日本実験力学会  2012  ( ISBN:4990340000

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  • 変形性膝関節症―病態と保存療法

    古賀良生( Role: Contributor ,  膝関節に作用する力-膝関節のバイオメカニクス)

    南江堂  2008.9  ( ISBN:4524240993

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  • よくわかる実験技術・学術用語

    坂本 信( Role: Contributor ,  接触応力)

    2006 

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  • Mechanical Loading of Bones and Joints

    SAKAMOTO Makoto( Role: Contributor ,  Biomechanics of Articular Joints: Review of a Decade of Progress of the Niigata Biomechanics Group)

    Springer  1999  ( ISBN:9784431658948

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  • In Vivo Stiffness Evaluation of Human Joint Capsule and Medial Collateral Ligament of Knee by Strain Ultrasound Elastography

    72 ( 4 )   142 - 148   2023.4

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  • 新潟大学における総合型選抜の実施状況について Reviewed

    吉田章人, 並川務, 坂本信

    大学入試研究ジャーナル   33   185 - 190   2023.3

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  • An Investigation of Three-Dimensional Relationships in Dental Curve Morphology between the Maxilla and Mandible

    細谷魁人, 石井義人, 坂本信, 亀田剛, 森清友亮, 小林公一, 遠藤英昭, 平元和彦

    日本実験力学会講演論文集   ( 23 )   2023

  • A Mathematical Formulation of Three-Dimensional Occlusal Planes using Cone-Beam Computed Tomography Image

    石井義人, 長江恒樹, 坂本信, 亀田剛, 小林公一, 平元和彦

    日本実験力学会講演論文集   ( 23 )   2023

  • In Vivo Assessment of Stiffness of Anterior Oblique Bundle of Ulnar Collateral Ligament Using Ultrasound Elastography

    菅原拓也, 坂本信, 森清友亮, 小林公一, 高根沢佑斗, 佐々木朋裕, 平元和彦

    日本機械学会M&M材料力学カンファレンス(CD-ROM)   2022   2022

  • Measurement of Stiffness of Supraspinatus Tendon Using Ultrasound Elastography

    太田航介, 坂本信, 森清友亮, 小林公一, 高根沢佑斗, 佐々木朋裕, 平元和彦

    日本機械学会M&M材料力学カンファレンス(CD-ROM)   2022   2022

  • CBCT画像を用いた個性正常咬合者の三次元上下顎歯の交角度

    石井義人, 坂本信, 亀田剛, 小林公一, 平元和彦

    日本生体医工学会大会プログラム・抄録集(Web)   61st   2022

  • Three-dimensional Mechanical Joint Contact Model

    70 ( 4 )   140 - 144   2021.4

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  • 【運動器のバイオメカニクス-Cutting Edge 2021:新しい解析手法と知見】その他の新しい手法 コーンビームCT画像を用いた新たな三次元歯列決定法

    坂本 信, 坂上 勇太, 森清 友亮, 亀田 剛, 小林 公一, 田邊 裕治

    整形・災害外科   64 ( 5 )   691 - 697   2021.4

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    <文献概要>本解説では,上下顎骨を撮影したコーンビームCT画像を用いてわれわれが考案した個人特有の三次元口腔内ワールド座標系に基づき,歯の形状重心から求めた三次元歯列を表現し,歯の三次元形状から主成分分析法で数学的に求めた歯の長軸方向である三次元歯軸も併せて示す新たな解析方法について述べた。はじめに,コーンビームCT画像の下顎の両側オトガイ孔2点と上顎切歯管1点を用いた解剖学的特徴点から構築した個人ごとの三次元口腔内ワールド座標系を新たに定義した。次に,正常咬合者を対象に歯列曲線や歯軸を口腔内座標系に基づいて定量的に表現した解析結果例より,上下顎歯列に対して,横断面では4次偶多項式,冠状面では6次偶多項式,矢状面では3次多項式でそれぞれの面内の歯列を数学的に表現できることを示した。

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  • Theory and Estimation of Viscoelastic Properties of Articular Cartilage by Indentation Test

    70 ( 4 )   150 - 153   2021.4

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  • 高校教員に向けた入試広報活動 ――新潟大学におけるアドミッションフォーラムを中心に―― Reviewed

    吉田 章人, 並川 努, 板倉 孝信, 坂本 信

    大学入試研究ジャーナル   31   265 - 271   2021.3

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  • イギリスの大学によるウェブサイトの活用法 ――バーミンガム大学の事例を中心に―― Reviewed

    板倉 孝信, 吉田 章人, 並川 努, 坂本 信

    大学入試研究ジャーナル   31 ( 364 )   357   2021.3

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  • The Relationship of Femoral Cortical Bone Thickness Measured by AP X-ray and by CT Images

    高根沢佑斗, 森清友亮, 坂上勇太, 小林公一, 坂本信, 古賀良生, 佐々木朋裕

    日本実験力学会講演論文集   ( 21 )   2021

  • Stiffness Measurement of Quadriceps and Patellar Tendons with Varying Knee Flexion Angles Using Strain Ultrasound Elastography

    坂本信, WADUGODAPITIYA Surangika, 森清友亮, 小林公一

    日本実験力学会講演論文集   ( 21 )   2021

  • Relative position analysis of the femur and tibia by load-unload at the knee OA

    森清友亮, 森隆裕, 古賀良生, 望月友晴, 大森豪, 小林公一, 坂本信, 田邊裕治

    日本機械学会M&M材料力学カンファレンス(CD-ROM)   2021   2021

  • Correlation of Upper and Lower Dental Arches Morphology Using Cone-beam CT Image

    石井義人, 坂本信, 坂上勇太, 亀田剛, 森清友亮, 小林公一, 平元和彦

    日本実験力学会講演論文集   ( 21 )   2021

  • Stress Distribution in Axisymmetric Contact Problem of an Elastic Layer-Substrate Body with a Cylindrical and Spherical Indenter

    57 ( 1 )   1 - 5   2020.12

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    We focus on internal stress and displacement of an elastic axisymmetric contact problem for indentation of a layer-substrate body. An elastic layer is assumed to be perfectly bonded to an elastic semi-infinite substrate. The elastic layer is smoothly indented with a flat-ended cylindrical and spherical indenter. The analytical and exact solutions were obtained by solving an infinite system of simultaneous equations using the method to express a normal contact stress at the upper surface of the elastic layer as an appropriate series. This paper presented the numerical results of internal stress and displacement distributions for hard-coating system with constant values of Poisson's ratio and the thickness of elastic layer.

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  • 2D MRIと3D MRIにおける膝蓋腱の長さ測定の比較

    古屋咲子, 近藤達也, 坂本信

    日本放射線技術学会東北支部雑誌(Web)   ( 29 )   2020

  • Anisotropic and Strain Rate Dependent Behaviour in Mechanical Properties of Porcine Vertebral Trabecular Bone

    田邊裕治, 齋藤凌, 坂本信, 小林公一

    材料の衝撃問題シンポジウム講演論文集(CD-ROM)   13th (Web)   2020

  • In Vivo Contact Analysis of Total Knee Arthroplasty During Knee Flexion

    小林公一, 坂本信, 佐藤卓, 大森豪, 古賀良生, 田邊裕治

    日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM)   57th   2020

  • L6 vertebra affects standing whole body sagittal alignment

    岡本昌士, 岡本昌士, 長谷川和宏, 初鹿野駿, 初鹿野駿, 下田晴華, 本間隆夫, 小林公一, 坂本信

    Journal of Spine Research (Web)   11 ( 3 )   2020

  • An Analytical Solution of Axisymmetric Contact Problem of Elastic Layer-substrate Body

    56 ( 2 )   15 - 20   2019.12

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    We consider an elastic contact problem for indentation test of layer-substrate body. An elastic layer assumed to be perfectly bonded to an elastic semi-infinite substrate. This problem called Boussinesq's problem which is axisymmetric mixed boundary value problem in elasticity theory. The elastic layer is smoothly indented by a flat-ended cylindrical and spherical indenter. This paper presents not only distribution of the dimensionless normal contact stress under cylindrical and spherical indenters but also distribution of the dimensionless normal displacement at the upper surface of the elastic layer. Numerical results are given for several combinations of the ratio of shear modulus, Poisson's ratio of elastic layer and substrate and the thickness of elastic layer. These results may establish the foundation for indentation test of layer-substrate composite and provide guideline for design of mechanical property of layered materials.

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    Other Link: http://hdl.handle.net/10928/1281

  • 破壊力学の展開 円形き裂の三次元弾性理論解析

    坂本信, 三浦鴻太郎, 小林公一, PRAMUDITA Jonas A, 田邊裕治

    非破壊検査   68 ( 4 )   173‐179 - 179   2019.4

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  • 成人脊柱変形患者における立位全身矢状面アライメントと重心動揺計によって計測した立位バランスとの関係

    初鹿野駿, 初鹿野駿, 長谷川和宏, 岡本昌士, 岡本昌士, 佐藤雄亮, 下田晴華, 本間隆夫, 笹本龍太, 小林公一, 坂本信

    Journal of Spine Research   10 ( 3 )   467   2019.3

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  • 頚髄症単独よりも頚髄症・腰部脊柱管狭窄症合併患者の方が立位バランスは不良である

    岡本昌士, 岡本昌士, 長谷川和宏, 初鹿野駿, 初鹿野駿, 佐藤雄亮, 下田晴華, 本間隆夫, 小林公一, 坂本信

    Journal of Spine Research   10 ( 3 )   677   2019.3

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  • 尿毒症と骨 7 ナノインデンテーションによる骨の力学的測定

    坂本信

    季刊腎と骨代謝   32 ( 1 )   51‐57   2019.1

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  • MRIによる大菱中手関節の生体内接触動態解析

    近藤史織, 森清友亮, 加藤舞, 坂本信, 坂上勇太, 風間清子, 小林公一, 田邊裕治

    日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM)   56th   2019

  • Three-Dimensional Definition of Dental Arch Using Cone-Beam Computed Tomographic Image

    坂上勇太, 坂本信, 森清友亮, 小林公一, 亀田剛, 田邊裕治

    日本機械学会M&M材料力学カンファレンス(CD-ROM)   2019   2019

  • In Vivo Stiffness Assessment of Knee Collateral Ligaments Using Strain Ultrasound Elastography

    坂本信, WADUGODAPITIYAI Surangika, 森清友亮, 田中正栄, 小林公一

    日本機械学会M&M材料力学カンファレンス(CD-ROM)   2019   2019

  • In Vivo Three-dimensional Analysis of the Human Trapeziometacarpal Joint Contact Behavior Using Magnetic Resonance Imaging

    森清友亮, 坂本信, 坂上勇太, 風間清子, 小林公一, 田邊裕治

    日本機械学会M&M材料力学カンファレンス(CD-ROM)   2019   2019

  • CBCTを用いた三次元歯軸および歯列弓の新規評価法

    坂上勇太, 坂本信, 森清友亮, 小林公一, 亀田剛, 田邊裕治

    日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM)   56th   2019

  • Three-Dimensional Assessment of Mechanical Axis and Loading Direction of the Lower Extremity

    藤原靖, 小林公一, 坂本信, 森清友亮, ADITYA Pramudita Jonas, 田邊裕治, 佐藤卓, 大森豪, 湊泉, 古賀良生

    日本機械学会年次大会講演論文集(CD-ROM)   2019   2019

  • 腰椎前弯頂椎と後弯前弯変曲椎からみた立位矢状面全身アライメント~健常例における検討~

    岡本昌士, 岡本昌士, 長谷川和宏, 初鹿野駿, 佐藤雄亮, 東野修, 小林公一, 坂本信

    日本側彎症学会演題抄録集   53rd   2019

  • MRIの3次元撮像法とCine法のイメージマッチングを用いた膝蓋腱の長さ変化測定

    近藤達也, 近藤達也, 坂本信, 小林公一, 金沢勉, 斉藤宏明

    日本放射線技術学会総会学術大会予稿集   75th   2019

  • 咬合時の接触点が歯根表面へ与える力学的影響―擬似三次元光弾性模型を用いた解析―

    遠藤英昭, 千葉美麗, 伊藤秀美, 金高弘恭, 坂本信

    日本実験力学会講演論文集   ( 18 )   91‐92   2018.8

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  • 関節のバイオメカニクス 核磁気共鳴画像法による示指中手指節関節の三次元生体内接触運動の解析

    坂本信, 小林公一, 春日勇人, 風間清子

    非破壊検査   67 ( 4 )   174‐179   2018.4

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  • Three-dimensional In Vivo Analysis of the Contact Motion of the Metacarpophalangeal Joint of the Index Finger with Magnetic Resonance Imaging

    坂本 信, 小林 公一, 春日 勇人, 風間 清子

    非破壊検査 : 検査と材料評価 : journal of the Japanese Society for Non-destructive Inspection   67 ( 4 )   174 - 179   2018.4

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  • コンピュータシミュレーションによる膝関節アライメント評価と人工膝関節術前計画・術後評価とその製品化

    坂本信, 小林公一, 古賀良生, 大森豪, 田邊裕治

    新潟医療福祉学会誌   17 ( 2 )   74 - 74   2018.3

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  • 腰仙部移行椎の全脊柱アライメントに及ぼす影響 Reviewed

    岡本昌士, 長谷川和宏, 初鹿野駿, 下田晴華, 本間隆夫, 小林公一, 坂本信

    Journal of Spine Research   9 ( 3 )   262   2018.3

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  • Viscoelastic relaxation indentation method of articular cartilage

    MIURA Kotaro, OYAMA Chihiro, MORI Takahiro, SAKAMOTO Makoto, KOBAYASHI Koichi, PRAMUDITA Jonas A, TANABE Yuji

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2018 ( 0 )   2G04   2018

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    DOI: 10.1299/jsmebio.2018.30.2G04

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  • 立位脊柱矢状面最大後弯頂点,最大前弯頂点および変曲椎(Sagittal spino‐pelvic profile)とPJFとの関連性

    岡本昌士, 長谷川和宏, 初鹿野駿, 小林公一, 坂本信

    日本脊椎インストゥルメンテーション学会抄録集   27th   108   2018

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  • Estimation of Relative Sliding Occurring at Knee Joint

    NAKAHARA Daisuke, KOBAYASI Koichi, SAKAMOTO Makoto, TANABE Yuji

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2018 ( 0 )   2018

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  • Development of Automated Image Matching Method Using Bi-plane Radiography and 3D Bone Models

    OKANIWA Daisuke, NAKAHARA Daisuke, KOBAYASHI Koichi, SAKAMOTO Makoto, TANABE Yuji

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2018 ( 0 )   2018

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  • Analysis of Surface Motion of Interphalangeal and Metacarpophalangeal Joints of Thumb

    SAKAMOTO MAKOTO, SUGITA KAITO, MORISE YUSUKE, KAZAMA KIYOKO, KOBAYASHI KOICHI, TANABE YUJI

    Transactions of Japanese Society for Medical and Biological Engineering   56 ( 0 )   S24 - S24   2018

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    &lt;p&gt;Knowledge of the behavior of articular cartilage contact is one of the requirements in designing artificial joints that reproduce precise finger functions. The thumb has a different role from the other fingers, and when one of the other fingers moves, the thumb moves to the opposite position, enabling pinching and grasping, which are essential to activities of daily living (ADLs). The interphalangeal (IP), metacarpophalangeal (MCP), and trapeziometacarpal (TMC) joints give the thumb more degrees of freedom than the other fingers. The purpose of the present in vivo study was to clarify the static three-dimensional articular cartilage contact behavior of the thumb IP and MCP joints in positions of the thumb commonly used in ADLs (i.e., pinch and grasp positions) and also to analyze the changes of the articular cartilage contact area and movements three-dimensionally using magnetic resonance imaging.&lt;/p&gt;

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  • イメージマッチングによる橈骨手根関節の生体内接触挙動評価

    小林公一, 風間清子, 坂本信

    日本生体医工学会大会プログラム・抄録集(Web)   57th   2018

  • 橈骨手根関節における軟骨接触挙動の生体内評価

    小林公一, 風間清子, 坂本信

    バイオエンジニアリング講演会講演論文集(CD-ROM)   31st   2018

  • 前歯に対するCBCTを用いた三次元歯軸および歯列の評価

    坂上勇太, 坂本信, 森清友亮, 小林公一, 亀田剛, 田邊裕治

    日本機械学会年次大会講演論文集(CD-ROM)   2018   2018

  • コーンビームCTを用いた三次元歯列弓の測定法

    坂上勇太, 坂本信, 森清友亮, 亀田剛, 小林公一, 坂井幸子, 遠藤英昭, 田邊裕治

    日本実験力学会講演論文集   ( 18 )   2018

  • 立位脊柱矢状面最大後弯頂点,最大前弯頂点におよび術前後アライメント変化量(Sagittal Spino-Pelvic Profile)とPJFとの関連性

    岡本昌士, 長谷川和宏, 初鹿野駿, 小林公一, 坂本信

    日本側彎症学会演題抄録集   52nd   2018

  • 腰椎変性疾患に対する除圧・固定術ではアライメントに有意な変化はないが立位バランスは改善する

    初鹿野駿, 長谷川和宏, 岡本昌士, 下田晴華, 本間隆夫, 小林公一, 坂本信

    Journal of Spine Research   9 ( 3 )   2018

  • 腰仙部移行椎の全脊柱アライメントに及ぼす影響

    岡本昌士, 長谷川和宏, 初鹿野駿, 下田晴華, 本間隆夫, 小林公一, 坂本信

    新潟整形外科研究会会誌   33 ( 2 )   116‐117   2017.12

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  • 粘弾性緩和インデンテーション試験法の関節軟骨への適用

    三浦鴻太郎, 小山千尋, 森隆裕, 坂本信, 小林公一, PRAMUDITA Jonas A, 田邊裕治

    バイオエンジニアリング講演会講演論文集(CD-ROM)   30th   319   2017.12

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  • 膝関節で生じる相対滑り量の推定

    中原大輔, 小林公一, 坂本信, 田邊裕治

    バイオエンジニアリング講演会講演論文集(CD-ROM)   30th   76   2017.12

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  • 二方向スロットラジオグラフィと三次元骨形状モデルを用いた自動イメージマツチング法の開発

    岡庭大祐, 中原大輔, 小林公一, 坂本信, 田邊裕治

    バイオエンジニアリング講演会講演論文集(CD-ROM)   30th   77   2017.12

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  • コンピュータシミュレーションによる膝関節アライメント評価と人工膝関節術前計画・術後評価とその製品化

    坂本信

    新潟医療福祉学会誌   17 ( 1 )   9   2017.10

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  • 有限厚さの粘弾性層の緩和インデンテーション試験に関する解析手法

    三浦鴻太郎, 坂本信, 小林公一, PRAMUDITA Jonas A, 田邊裕治

    日本機械学会M&amp;M材料力学カンファレンス(CD-ROM)   2017 ( 0 )   ROMBUNNO.OS1102   2017.10

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    &lt;p&gt;Viscoelastic models are necessary to simulate the behavior of time-dependency materials such as polymer industrial products and biological tissues. Indentation test have been widely used in the many study because of its simplicity for estimate of local mechanical properties of bulk materials. This study obtained analytical solution of relaxation indentation problem of viscoelastic thin layer bonded on rigid substrate indented by flat-ended cylindrical punch using elastic-viscoelastic corresponding principle for axisymmetric elastic contact problem. The relaxation indentation test is conducted for two different polymer materials which are polymethyl methacrylate (PMMA) and polyvinyl chloride (PVC) and bovine articular cartilage of the femoral head. For bovine articular cartilage, normal cartilage treated by collagenase after relaxation indentation test and test is conducted again. The standard linear solids model is chosen as viscoelastic model in this study, then viscoelastic parameters of the model are determined by fitting experimental data collected from the relaxation indentation test. As results, the values of Root Mean Squared Error (RMSE) which indicate the error between experimental data and analytical solution show 0.59, 0.37 for respectively PMMA, PVC and 0.78, 0.52 for respectively normal and treated bovine articular cartilage. The results indicate articular cartilage needs more complicated viscoelastic model than the standard linear solid model. The analysis provide a fundamental basis for evaluating viscoelastic parameters of thin layer with the relaxation indentation test.&lt;/p&gt;

    DOI: 10.1299/jsmemm.2017.OS1102

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  • ヒト母指指節間関節のMRIによる三次元生体内接触挙動解析

    森清友亮, 坂本信, 杉田魁人, 風間清子, 小林公一, 田邊裕治

    日本機械学会年次大会講演論文集(CD-ROM)   2017 ( 0 )   ROMBUNNO.J0210202   2017.9

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    &lt;p&gt;The interphalangeal (IP) joint of the thumb are formed by the articulation between the proximal phalanges head (PPH) and the distal phalanges base (DPB). The measurement of the contact behavior, i.e., distribution and magnitude of the joint contact area with motion is necessary to understand the effects of loading on articular cartilage. The purpose of this study is to determine the in vivo contact behavior of the IP joint of thumb using the MRI. Five normal right thumbs from 5 healthy subjects were examined. Subjects were scanned with their dominant hand in three positions. Contact area was determined by measuring the length of contact between the PPH and DPB in each slice, multiplying this length by slice thickness of 1-mm, and summing these values. We found that the average cartilage contact area attains a minimum value in the neutral position. We also found that the distal phalanx of thumb IP joint was caused internal rotation on the distal phalanx with flexion.&lt;/p&gt;

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  • 橈骨手根関節における接触領域の生体内評価

    小林公一, 風間清子, 坂本信

    日本機械学会年次大会講演論文集(CD-ROM)   2017 ( 0 )   ROMBUNNO.J0210201   2017.9

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    &lt;p&gt;Assessment of in vivo articular contact behavior at the wrist joint are important for understanding the biomechanical functions under physiological and pathological loading. The objective of this study was to evaluate in vivo articular contact behavior between the radius and scaphoid and between the radius and lunate using a two-dimensional to three-dimensional image matching technique. Two normal male subjects were enrolled in this study. Biplanar X-ray images were taken during dosal flexion/palmar flexion and ulnar/radial deviation of the wrist joint. The articular contact was estimated from the joint space distance smaller than the cartilage layer thickness measured using a MRI scanner. The distributions of estimated contact area and the contact locations varied markedly with wrist position. The present result would be able to provide a fundamental knowledge about the biomechanics of the wrist joint.&lt;/p&gt;

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  • 咬合力が歯の形態へ与える力学的影響―擬似三次元光弾性模型を用いた解析―

    遠藤英昭, 千葉美麗, 伊藤秀美, 金高弘恭, 坂本信

    日本実験力学会講演論文集   ( 17 )   155‐156   2017.8

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  • 前歯部のコーンビームCT画像による三次元自動歯軸

    坂本信, 坂上勇太, 森清友亮, 亀田剛, 小林公一, 坂井幸子, 遠藤英昭, 田邊裕治

    日本実験力学会講演論文集   ( 17 )   157‐158   2017.8

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  • 二方向スロットラジオグラフィと三次元形状モデルによる股関節位置評価法

    岡庭大祐, 中原大輔, 小林公一, 坂本信, 田邊裕治

    日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM)   54th ( 0 )   ROMBUNNO.E044   2017.3

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  • ウシ関節軟骨のインデンテーション試験による弾性率測定

    平木大介, 坂本信, 小林公一, PRAMUDITA Jonas A, 田邊裕治

    日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM)   54th ( 0 )   ROMBUNNO.E043   2017.3

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  • MRIによるヒト中指中手指節関節の三次元生体内接触挙動

    森清友亮, 坂本信, 杉田魁人, 風間清子, 小林公一, 田邊裕治

    日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM)   54th ( 0 )   ROMBUNNO.E042   2017.3

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  • Evaluation method for implant positioning of artificial hip joint using bi-plane standing slot radiography

    OKANIWA Daisuke, NAKAHARA Daisuke, TANABE Yuji, KOBAYASHI Koichi, SAKAMOTO Makoto

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2017 ( 0 )   2017

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  • In vivo three-dimensional analysis of the contact behavior of the human metacarpophalangeal joint of the middle finger using magnetic resonance imaging

    SAKAMOTO Makoto, KOBAYASHI Koichi, SUGITA Kaito, KAZAMA Kiyoko, MORISE Yusuke, TANABE Yuji

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2017 ( 0 )   2017

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  • 立位脊柱矢状面最大後弯と最大前弯の変曲椎に関する検討

    岡本昌士, 長谷川和宏, 初鹿野駿, 小野真稔, 下田晴華, 本間隆夫, 小林公一, 坂本信

    日本側彎症学会演題抄録集   51st   2017

  • 被覆層‐基質物体のインデンテーション法における三次元弾性理論解析

    三浦鴻太郎, 坂本信, 小林公一, PRAMUDITA Jonas A, 田邊裕治

    日本機械学会年次大会講演論文集(CD-ROM)   2016 ( 0 )   ROMBUNNO.J0250301   2016.9

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    &lt;p&gt;We consider an elastic contact problem for indentation test of layer-substrate body. An elastic layer assumed to be perfectly bonded to an elastic semi-infinite substrate. This problem called Boussinesq&#039;s problem which is axisymmetric mixed boundary value problem in elasticity theory. The elastic layer is smoothly indented by a flat-ended cylindrical and spherical indenter. The analytical solutions are obtained by solving an infinite system of simultaneous equations using the method of expressing a normal contact stress at the upper surface of the elastic layer as an appropriate series. Convergence can be achieved using less than 10 terms of the series. The accuracy of values of present numerical results is verified by comparing the dimensionless axial load of present results with results of some previous literatures. Additionally, this paper presents not only distribution of the dimensionless normal contact stress under cylindrical and spherical indenters but also distribution of the dimensionless normal displacement at the upper surface of the elastic layer. Numerical results are given for several combinations of the ratio of shear modulus, Poisson&#039;s ratio of elastic layer and substrate and the thickness of elastic layer. These results may establish the foundation for indentation test of layer-substrate composite and provide guideline for design of mechanical property of layered materials.&lt;/p&gt;

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  • 生体内コーンビームCT画像による三次元自動歯軸

    坂本信, 森清友亮, 小林公一, 亀田剛, 坂井幸子, 遠藤英昭, 田邊裕治

    日本機械学会年次大会講演論文集(CD-ROM)   2016 ( 0 )   ROMBUNNO.S0220202   2016.9

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    &lt;p&gt;The tooth axis is important as a morphological reference axis; however, a general definition of the tooth axis has not been established. This study presented a novel method of automatically calculating three-dimensional tooth axes on in vivo Cone-Beam Computed Tomography (CBCT) images. In this study, 36 teeth were obtained from 12 central and lateral incisors, and canines of 3 human subjects, respectively. Human in vivo images were obtained using a CBCT at a spatial resolution of 0.183 mm&lt;sup&gt;3&lt;/sup&gt; . The automatically tooth axis (PC-A) was calculated using principal component (PC) analysis of the segmented tooth and mandible. In experimental results using 36 teeth, the average relative angular errors between the tooth axes T-A manually specified by three dentists and the PC-A automatically calculated by the proposed method were 2.2 ± 1.4° for central incisors, 1.7 ± 1.0° for lateral incisors, 2.3 ± 1.4° for canines, respectively. The relative distance errors between the T-A and the PC-A were 0.39 ± 0.17 mm, 0.39 ± 0.21 mm and 0.63 ± 0.34 mm for central incisors, lateral incisors and canines, respectively. The experimental results of this study demonstrate that the proposed method of CBCT can accurately and automatically identify individual three-dimensional tooth axes.&lt;/p&gt;

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  • 皮膚マーカから推定した3次元膝関節運動の誤差評価

    小林公一, 風間清子, 坂本信

    日本機械学会年次大会講演論文集(CD-ROM)   2016 ( 0 )   ROMBUNNO.S0220203   2016.9

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    &lt;p&gt;Although the trajectories of skin markers tracked with an optical motion capture system have widely been used as the estimates of the underlying bone motions, the reliability of the kinematics parameters derived from the skin marker-based technique has often questioned due to soft tissue artefact. The objective of this study was to evaluate soft tissue artefact associated with knee flexion. One healthy female subject participated in this study. The subject underwent CT scan to reconstruct 3D femoral and tibial bone models. Twenty two polymeric markers with radio-opaque beads in its center were attached to the thigh and the shank. The initial coordinate transformation matrices were determined between skin marker cluster and the femur or the tibia using an image registration technique at extension of the knee. The movements of the femur and tibia from extension to 90° of flexion of the knee were recovered using two methods: 1) Placing the bone models according to the initial coordinate transformation matrices. 2) Placing the bone models using updated coordinate transformation matrices at every time step by a point-cluster technique. Although the latter method created more realistic bony movements especially at large knee flexion angles, a certain amount of soft tissue artefact still remained.&lt;/p&gt;

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  • 歯への応力が下顎骨に与える力学的影響―擬似三次元光弾性模型を用いた解析―

    遠藤英昭, 千葉美麗, 伊藤秀美, 金高弘恭, 坂本信

    日本実験力学会講演論文集   ( 16 )   175‐177   2016.9

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  • 核磁気共鳴画像を用いたヒト示指近位指節間関節の三次元生体内接触挙動解析

    坂本信, 森清友亮, 風間清子, 近藤達也, 小林公一, 田邊裕治

    日本実験力学会講演論文集   ( 16 )   121‐122   2016.9

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  • 大腿部および下腿部の皮膚マーカから推定した3次元膝関節運動の評価誤差

    小林公一, 風間清子, 坂本信

    日本実験力学会講演論文集   ( 16 )   119‐120   2016.9

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  • 先読み!「早期変形性膝関節症」Part3 要因・病態 膝OA発生時に下肢に認められる初期変化

    古賀良生, 大森豪, 田邊裕二, 坂本信

    Bone Joint Nerve   6 ( 3 )   519‐525   2016.7

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  • The pathogenesis of knee osteoarthritis, its relation to the three dimensional change of leg alignment

    古賀 良生, 大森 豪, 田邊 裕二, 坂本 信

    Bone joint nerve : BJN   6 ( 3 )   519 - 525   2016.7

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    Other Link: http://search.jamas.or.jp/link/ui/2017080661

  • 歯科バイオメカニクス 三次元歯軸の自動決定法

    坂本信, 小林公一, 坂井幸子, 遠藤英昭

    非破壊検査   65 ( 4 )   163‐168   2016.4

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  • Automatic Method of Three-Dimensional Tooth Axis

    坂本 信, 小林 公一, 坂井 幸子, 遠藤 英昭

    非破壊検査   65 ( 4 )   163 - 168   2016.4

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  • 2方向スロットラジオグラフィによる立位3次元下肢アライメント評価法

    岡庭大祐, 高橋匠, 小林公一, 坂本信, 田邊裕治

    日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM)   53rd   ROMBUNNO.908   2016.3

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  • 生体内コーンビームCT画像を用いた三次元歯軸の自動決定法

    坂本信, 森清友亮, 小林公一, 亀田剛, 坂井幸子, 遠藤英昭, 田邊裕治

    日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM)   53rd   ROMBUNNO.910   2016.3

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  • [Estimations of mechanical properties of bones using nanoindentation]. Reviewed

    Sakamoto M

    Clinical calcium   26 ( 1 )   81 - 91   2016.1

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  • 1F16 In Vivo Three-Dimensional Analysis of the Contact Motion Behavior of the Proximal Interphalangeal Joint of the Index Finger Using MRI

    MORISE Yusuke, SAKAMOTO Makoto, KAZAMA Kiyoko, KONDO Tatsuya, KOBAYASHI Koichi, TANABE Yuji

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2016 ( 0 )   _1F16 - 1_-_1F16-3_   2016

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    The proximal interphalangeal (PIP) joint of the finger are formed by the articulation between the proximal phalanges head (PPH) and the middle phalanges base (MPB). The PPH has two rounded condyles, separated by a shallow central groove. The opposing surface of the MPB has two shallow concave facets separated by a central ridge. Determination of distribution of joint contact and joint motion are necessary to understanding the progression of joint deterioration and to the design of appropriate implants for finger joint arthroplasty. Traditionally, such data have been obtained from in vitro study of cadaveric specimens. Magnetic resonance imaging (MRI) has recently been shown to be a valid method of quantifying the joint contact area, indicating the potential for in vivo assessment. In the present study, we adapted an MRI system to study the three-dimensional in vivo articular cartilage contact areas and contact distributions of the PIP joint of the index finger on adopting three flexion angles.

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  • 2方向スロットラジオグラフィと3次元形状モデルによる下肢アライメント評価法

    小林公一, 高橋匠, 岡庭大祐, 坂本信, 田邊裕治

    バイオエンジニアリング講演会講演論文集   28th (CD-ROM)   ROMBUNNO.1F25   2016

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  • 908 Three-Dimensional Evaluation of Lower Leg Alignment Using Bi-Plane Slot Radiography

    OKANIWA Daisuke, TAKAHASHI Takumi, KOBAYASHI Koichi, SAKAMOTO Makoto, TANABE Yuji

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2016 ( 0 )   _908 - 1_-_908-5_   2016

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  • 1F25 Alignment assessment of lower extremity using biplanar slot radiography and 3D model

    KOBAYASHI Koichi, TAKAHASHI Takumi, OKANIWA Daisuke, SAKAMOTO Makoto, TANABE Yuji

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2016 ( 0 )   _1F25 - 1_-_1F25-5_   2016

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    A slot-scan digital radiography (SSDR) system uses collimated fan beam x-rays synchronized with the movement of a flat-panel detector. This system allows to obtain a full length x-ray image of the body with reduced dose and small image distortion compared with conventional x-ray systems. The purpose of this study was to develop a method for evaluation of the three-dimensional (3D) alignment of the lower extremity using a biplanar SSDR system and bone surface models. The biplanar SSDR system used a rotation table positioned at 0 deg and 60 deg relative to the optical axis of an X-ray source. Camera calibration was performed using an acrylic frame with 72 radiopaque markers. Sawbone femur and tibia were used to replicate the alignment of lower extremity. Three acrylic markers were attached to each sawbone to define the local coordinate system Computed tomography of the sawbone femur and tibia was performed to allow the reconstruction of the 3D surface models. Then the femur and tibia were fixed at three different alignments of the knee; extension, axial rotation, and varus deformity. For each alignment the femur and tibia were imaged using the biplanar SSDR system. The 3D positions of the femur and tibia were recovered using an interactive 2D to 3D image registration method. Overall, the largest estimation errors were 1.1 mm in translation and 0.9 deg in rotation, demonstrating that this method has an adequate accuracy for the clinical usage.

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  • 910 Automatic Determination Technique of Three-Dimensional Tooth Axis Using In Vivo Cone-Beam CT Images

    SAKAMOTO Makoto, MORISE Yusuke, KOBAYASHI Koichi, KAMEDA Takashi, HAYASHI-SAKAI Sachiko, ENDO Hideaki, TANABE Yuji

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2016 ( 0 )   _910 - 1_-_910-3_   2016

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  • 骨質・骨強度の評価 ナノインデンテーションによる骨力学特性評価

    坂本信

    Clin Calcium   26 ( 1 )   81 - 91   2015.12

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  • OS19-4 Elastic Theory of Indentation Test of Biological Tissues and Approximate Solution(Orthopaedic Biomechanics,OS19 Biomechanics and its applications,BIOMECHANICS)

    Miura Kotaro, Sakamoto Makoto, Kobayashi Koichi, Tanabe Yuji

    Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics   2015 ( 14 )   248 - 248   2015.10

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  • OS19-5 Biplanar Slot-Scan Digital Radiography for Evaluation of Three-Dimensional Lower Extremity Alignment with the Use of Bone Surface Models(Orthopaedic Biomechanics,OS19 Biomechanics and its applications,BIOMECHANICS)

    Kobayashi Koichi, Takahashi Takumi, Okaniwa Daisuke, Sakamoto Makoto, Tanabe Yuji

    Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics   2015 ( 14 )   249 - 249   2015.10

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  • PS5-11 IN VIVO CONTACT CHARACTERISTICS OF THE METACARPOPHALANGEAL JOINT(PS5: Poster Short Presentation V,Poster Session)

    Morise Yusuke, Sakamoto Makoto, Kazama Kiyoko, Kobayahsi Koichi, Tanabe Yuji

    Proceedings of the ... Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics   2015 ( 8 )   309 - 309   2015.9

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  • コーンビームCTを用いた三次元歯軸の自動決定

    坂本信, 坂井幸子, 小林公一, 遠藤英昭

    日本機械学会年次大会講演論文集(CD-ROM)   2015   ROMBUNNO.J0230102   2015.9

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  • 2方向X線画像と3次元骨形状モデルを用いた下腿部と足部おける皮膚マーカの誤差評価

    小林公一, 風間清子, 風間清子, 坂本信

    日本機械学会年次大会講演論文集(CD-ROM)   2015   ROMBUNNO.J0230402   2015.9

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  • 回内・回外時の橈骨‐尺骨間運動の3次元生体内解析―肘関節伸展位と屈曲位での比較―

    風間清子, 風間清子, 近藤達也, 小林公一, 坂本信

    日本放射線技術学会雑誌   71 ( 9 )   897   2015.9

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  • 2方向スロットラジオグラフィを用いた3次元立位下肢アライメント評価法の精度

    高橋匠, 小林公一, 坂本信, 田邊裕治

    日本実験力学会講演論文集   ( 15 )   5 - 7   2015.8

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  • 咬合筋の収縮が下顎骨に与える力学的影響―擬似三次元光弾性模型を用いた解析―

    遠藤英昭, 千葉美麗, 伊藤秀美, 金高弘恭, 坂本信

    日本実験力学会講演論文集   ( 15 )   34 - 37   2015.8

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  • 示指中手指節間関節の接触挙動のMRIによる生体内解析

    坂本信, 森清友亮, 風間清子, 近藤達也, 小林公一, 田邊裕治

    日本実験力学会講演論文集   ( 15 )   25 - 29   2015.8

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  • 機械工学年鑑 4.バイオエンジニアリング

    山本憲隆, 坂本信, 石川拓司, 小玉哲也, 中島求, 山本希美子

    日本機械学会誌   118 ( 1161 )   456 - 458   2015.8

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  • 2D/3Dイメージマッチング法を用いた下腿部と足部における皮膚マーカの誤差評価

    小林公一, 風間清子, 風間清子, 坂本信

    日本実験力学会講演論文集   ( 15 )   32 - 33   2015.8

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  • 膝関節の屈曲に伴う後十字靱帯の力学的特性 Reviewed

    近藤達也, 坂本信, 小林公一

    日本実験力学会講演論文集   ( 15 )   19 - 24   2015.8

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  • 回内・回外に伴う橈尺関節の生体内運動解析

    風間清子, 春日勇人, 小林公一, 坂本信

    バイオエンジニアリング講演会講演論文集   27th   181 - 182   2015.1

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  • 中手指節関節の接触挙動の生体内解析

    森清友亮, 春日勇人, 風間清子, 坂本信, 小林公一, 田邊裕治

    バイオエンジニアリング講演会講演論文集   27th   183 - 184   2015.1

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  • 2方向スロットラジオグラフィによる関節アライメントの3次元評価法

    高橋匠, 小林公一, 坂本信, 田邊裕治

    バイオエンジニアリング講演会講演論文集   27th   185 - 186   2015.1

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  • J0230402 Evaluation of skin marker artefact on shank and foot using bi-plane radiography and 3D bone models

    KOBAYASHI Koichi, KAZAMA Kiyoko, SAKAMOTO Makoto

    The Proceedings of Mechanical Engineering Congress, Japan   2015 ( 0 )   _J0230402 - -_J0230402-   2015

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    Motion capture systems estimate underlying bone movements by tracking trajectories of skin-mounted markers. However, the reliability of the kinematics parameters derived from the skin markers has often questioned due to skin movement artefact. The objective of this study was to evaluate skin movement artefact associated with dorsiflexion and plantar flexion of the foot using 3D bone models and bi-plane radiography. Four healthy subjects participated in this study. The subject underwent CT scan to reconstruct 3D tibial, the first metatarsal bone, and the fifth metatarsal bone models. Sixteen polymeric markers with radio-opaque beads in its center were attached to the shank and foot. To quantify the skin marker movement with respect to the tibia, the first metatarsal bone, and fifth metatarsal bone, bi- plane radiographic images were collected during neutral, plantar flexion, and dorsiflexion of the foot. The positions of the tibia, the first metatarsal bone, and the fifth metatarsal bone were recovered by a 2D to 3D image registration method. Then the positions of the markers were determined with respect to the relevant coordinate system embedded in the 3D bone models. The mean values ± SD of the translations in the corresponding markers with plantar flexion were 3.1 ± 1.8 mm for the tibia, 8.2 ± 4.2 mm for the first metatarsal bone, and 14.0 ± 6.3 mm for the fifth metatarsal bone. With dorsiflexion, the translations were 6.0 ± 3.1 mm for the tibia, 18.1 ±6.4 mm for the first metatarsal bone, and 36.0 ±12.8 mm for the fifth metatarsal bone.

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  • 1E14 In vivo motion analysis of radioulnar joint during pronation/supination

    KAZAMA Kiyoko, KASUGA Yuto, KOBAYASHI Koichi, SAKAMOTO Makoto

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2015 ( 0 )   181 - 182   2015

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  • 1E15 In vivo analysis of the contact behavior in the metacarpophalangeal joint

    MORISE Yusuke, KASUGA Yuto, KAZAMA Kiyoko, SAKAMOTO Makoto, KOBAYASHI Koichi, TANABE Yuji

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2015 ( 0 )   183 - 184   2015

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  • 1E16 Three-dimensional assessment of joint alignment using bi-plane slot radiography

    TAKAHASHI Takumi, KOBAYASHI Koichi, SAKAMOTO Makoto, TANABE Yuji

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2015 ( 0 )   185 - 186   2015

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  • 4・2・1 筋骨格のバイオメカニクス(4・2 バイオメカニカルエンジニアリング,4.バイオエンジニアリング,<特集>機械工学年鑑)

    坂本 信

    日本機械学会誌   118 ( 1161 )   456 - 456   2015

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  • Mechanical influences for mandibular bone by occlusal muscles : analysis by quasi-three dimensional photoelastic model

    遠藤 英昭, 千葉 美麗, 伊藤 秀美, 金高 弘恭, 坂本 信

    日本実験力学会講演論文集 : 年次講演会 = Proceedings of JSEM : annual Conference on Experimental Mechanics   ( 15 )   34 - 37   2015

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  • In Vivo MRI Analysis of Contact Behavior of the Metacarpophalangeal Joint of the Index Finger

    坂本 信, 森清 友亮, 風間 清子, 近藤 達也, 小林 公一, 田邊 裕治

    日本実験力学会講演論文集 : 年次講演会 = Proceedings of JSEM : annual Conference on Experimental Mechanics   ( 15 )   25 - 29   2015

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  • Mechanical Characteristics of the Posterior Cruciate Ligament on the Knee Flexion

    近藤 達也, 坂本 信, 小林 公一

    日本実験力学会講演論文集 : 年次講演会 = Proceedings of JSEM : annual Conference on Experimental Mechanics   ( 15 )   19 - 24   2015

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  • Accuracy of 3D lower leg alignment assessment system using biplanar slot radiography

    高橋 匠, 小林 公一, 坂本 信, 田邊 裕治

    日本実験力学会講演論文集 : 年次講演会 = Proceedings of JSEM : annual Conference on Experimental Mechanics   ( 15 )   5 - 7   2015

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  • J0230102 Automatic Determination of Three-Dimensional Tooth Axis Using Cone-Beam CT

    SAKAMOTO Makoto, HAYASHI-SAKAI Sachiko, KOBAYASHI Koichi, ENDO Hideaki

    The Proceedings of Mechanical Engineering Congress, Japan   2015 ( 0 )   _J0230102 - -_J0230102-   2015

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    The tooth axis is an important as a morphological reference axis. However, a general definition of the tooth axis has not been established. The aim of this study was to use cone beam computed tomography (CBCT) to determine three-dimensional tooth axes (PC-A) based on principal component analysis automatically, and to estimate errors in the axes compared with those determined using micro-computed tomography (μCT), the standard of reference. We compared the tooth axis PC-A using three differential modes of CBCT (spatial resolution: D-mode = 0.1 × 0.1 × 1.0 mm^3, I-mode = 0.19 × 0.19 × 1.0 mm^3, A-mode = 0.3125 x 0.3125 x 1.0 mm^3) and uCT (spatial resolution: 0.033 × 0.033 x 0.033 mm^3) imaging of 22 human teeth: three incisors, four canines, seven premolars, and eight molars. The average relative angular errors and distance errors of PC-A between μCT and I-mode of CBCT were 0.51 ± 0.22 deg. and 0.16 ± 0.10 mm, respectively. As experimental results using the 22 teeth, the average relative angular errors between the tooth axes manually specified by three dentists and the PC-A automatically calculated from I-mode of CBCT with the proposed method were 1.97 ± 0.60 deg. for incisors, 1.92 ± 0.96 deg. for canines, 3.05 ± 1.28 deg. for premolars and 3.98 ± 1.43 deg. for molars, respectively.

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  • MRIを用いた中手指節関節における接触領域の生体内解析

    春日勇人, 風間清子, 坂本信, 小林公一

    日本機械学会年次大会講演論文集(CD-ROM)   2014   ROMBUNNO.J0210205   2014.9

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  • 三次元歯軸の自動決定法に関する研究

    坂本信, 春日勇人, 坂井幸子, 小林公一, 遠藤英昭

    日本機械学会年次大会講演論文集(CD-ROM)   2014   ROMBUNNO.J0210204   2014.9

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  • 前腕の回内・回外に伴う橈骨‐尺骨運動の三次元生体内解析

    風間清子, 春日勇人, 小林公一, 坂本信

    日本機械学会年次大会講演論文集(CD-ROM)   2014   ROMBUNNO.J0210203   2014.9

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  • 主成分分析を用いた三次元歯軸の自動決定

    坂本信, 春日勇人, 坂井幸子, 小林公一, 遠藤英昭

    日本実験力学会講演論文集   ( 14 )   358 - 361   2014.8

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  • 咬筋が咬合時に歯槽骨に与える力学的影響―光弾性模型を用いた解析―

    遠藤英昭, 千葉美麗, 伊藤秀美, 金高弘恭, 坂本信

    日本実験力学会講演論文集   ( 14 )   355 - 357   2014.8

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  • 膝関節MRIのボリュームレンダリングによるイメージレジストレーション

    小林公一, 坂本信, 田邊裕治

    日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM)   51st   ROMBUNNO.212   2014.3

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  • Study of Risk Assessment among nursing students : Analysis of eye movements and observation intentions using clinical pediatric photos

    Ikarashi Mari, Tanaka Chiaki, Sumiyoshi Tomoko, Sakamoto Makoto, Tanaka Mio, Watanabe Tamiko

    新潟大学保健学雑誌 = Journal of health sciences of Niigata University   11 ( 1 )   17 - 24   2014.3

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    本研究の目的は,小児臨床写真を観察している時の視線運動と,その観察意図から,卒業年次の看護学生の危険予知の実態を明らかにすることである.大学4年生の看護学生11名を対象に,小児臨床写真を1分間観察させた後,その視線運動の解析ならびに面接調査から分析を行った。写真は危険を予知できる8領域を区分し,その領域間の注視回数,注視時間を比較した。その結果,以下の点が明らかとなった。対象者は,画面から危険を探ろうとする視線の動きと探索的な観察法を認めた.危険予知の内容では,転倒・転落は多くの対象者が指摘したが,輸液の間違いや薬剤無投与の危険について発言した者はいなかった。This study aims to clarify the actual ability of nursing students to assess medication error risks using clinical pediatric photos. Photos were shown to eleven 4th year university students who were allowed to observe for 1 minute and their eye movements were analyzed along with the results of interviews conducted with the students. Photos consisted of 8 risks that students should be able to assess and each photo was divided into 8 sections with one risk in each section. Gaze count and time were compared for each of these 8 sections. The results of this analysis are as follows. It was acknowledged that subjects&#039; eyes were moving as they tried to screen the whole photo for risks and that they were using exploratory observation methods. Many of the subjects were able to assess the risk of children falling out of their beds. However, no subjects noticed the risks of errors in volume of intravenous fluids or the risks of non-administration of medication for children.

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  • Assessment of an educational program that used the eye-tracking and which fostered "awareness for observation and judgment" in novice nurses : Analysis of novice nurses awareness after watching "educational DVD" showing of nurses with substantial clinical experience

    Nishikata Mayumi, Nishihara Ayako, Sadakata Mieko, Seino Yumiko, Ikoshi Sumiko, Kasai Mikako, Sato Fukiko, Kawai ko, Sakamoto Makoto, Kourakata Itaru, Tanabe Yuji

    新潟大学保健学雑誌 = Journal of health sciences of Niigata University   11 ( 1 )   25 - 32   2014.3

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    Purpose of the present study is to qualitatively analyze the awareness of novice nurses after watching the educational DVD, where analysis of line of vision and intention of observation of nurses with substantial clinical experience were recorded, and to conduct the assessment of the educational program. We provided educational support where after presenting the eye-tracking data taken after six months of joining the service to 28 novice nurses, we asked them to watch the educational DVD so that they can understand the disposition of observation or judgment of nurses with substantial experience. We summarized the conversation of educational support by the respective meaningful context, and after that we coded them. As a result, we could classify it in categories of [analysis of characteristic features of observation of nurses with substantial experience], [confirming the intention of observation of nurses with substantial experience], [assessment of inadequate items in observation and habit of observation], [clarification of issues], and [awareness about peace of mind and growth provided by the trajectory of similar line of vision] and thought that they could understand the disposition of observation or judgment of nurses with substantial experience. We think that this educational program had the effects in promoting the process in which a clinical wisdom of nurses with substantial experience used the language and visualization teaching is taken in, and in a self-subject giving the significance for novice nurses.

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    Other Link: http://hdl.handle.net/10191/38935

  • Automatic three-dimensional tooth axis using principal component analysis

    坂本 信, 春日 勇人, 坂井 幸子

    日本実験力学会講演論文集   ( 14 )   358 - 361   2014

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  • 212 Image Registration Using MRI Volume Rendering of Knee Joint

    KOBAYASHI Koichi, SAKAMAOTO Makoto, TANABE Yuji

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2014 ( 0 )   _212 - 1_-_212-2_   2014

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  • 1D34 Theoretical analysis for the elastic contact of the joint model

    SAKAMOTO Makoto, KOBAYASHI Koichi

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2014 ( 0 )   109 - 110   2014

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  • 1D45 Position estimation of knee joint using single-plane fluoroscopy and MRI volume data

    KOBAYASHI Koichi, SAKAMOTO Makoto, TANABE Yuji

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2014 ( 0 )   119 - 120   2014

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  • J0210203 In vivo 3D motion analysis of radioulnar joint during forearm pronation/supination

    KAZAMA Kiyoko, KASUGA Yuto, KOBAYASHI Koichi, SAKAMOTO Makoto

    The Proceedings of Mechanical Engineering Congress, Japan   2014 ( 0 )   _J0210203 - -_J0210203-   2014

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    Pronation-supination movement of the forearm is very important to ensure smoothed motion during daily and sports activities. Since abnormal motions in the radioulnar joint during pronation-supination may cause distal radioulnar joint diseases, evaluation of the three-dimensional (3D) position of the radioulnar joint is necessary in order to elucidate the development and progression of the distal radioulnar joint diseases. The purpose of this study is to present an in-vivo method for analyzing 3D forearm motion with low radiation exposure and high accuracy. This method combines calibrated bi-plane X-ray imaging (frontal and lateral views) and CT scan of forearm to create 3D radius and ulna models. The 3D positions of the radius and ulna were recovered by matching the projected outline of the 3D bone model with the calibrated bi-plane x-ray image of the corresponding bone. Bi-plane X-ray images of forearms of 5 normal subjects were taken at the 90° of pronation, 45° of pronation, neutral position, 45° of supination, and 90° of supination. The relative position of the radius with respect to the ulna was evaluated during pronation-supination. Dorsal-palmar and radius-ulnar translations of radius were larger than proximal-distal translation. Maximum translation, 21.2 ± 3.8 mm, was found in dorsal-palmar direction at 90° of supination. Rotation about proximal-distal axis of radius was much larger than those about dorsal-palmar and radius-ulnar axes. Rotation angle reached its maximum value, 64.0 ± 11.1°, at 90° of supination.

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  • 学生と教員が学び鍛えあう保健学教育 : 専門性を理解しあいインタラクティブに学び鍛えあう保健学教育《平成23年度新潟大学組織的教育プログラム実施報告》

    藤原 直士, 富山 智香子, 坂本 信, 山崎 芳裕, 李 鎔範, 定方 美恵子, 村松 芳幸, 齋藤 君枝, 住吉 智子, 鈴木 力

    新潟大学高等教育研究   1 ( 2 )   1 - 4   2014

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    平成23年度新潟大学組織的教育プログラム(新潟大学GP)医学部保健学科取組「学生と教員が学び鍛えあう保健学教育」は,医療を支える使命感と能力をもち,チーム医療に対応できる人材の育成をめざす2つの教育プログラムの実質化を進めた.保健学ヘの動機づけを図るプログラム「My confident lecture」では,新規科目「保健学総合」を初年次学生向けに開講し,学生参加型授業などの新しいタイプの授業の試みを行った.「保健学総合」を実践的に展開するプログラム「Our project study」では,少人数型の演習科目「保健学総合演習」の平成24年度開講をめざして模擬授業を試みた.それらの活動内容について,取組の課題とともに紹介する.

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  • J0210205 In vivo analysis of the contact area in the metacarpophalangeal joint using MRI

    KASUGA Yuto, KAZAMA Kiyoko, SAKAMOTO Makoto, KOBAYASHI Koichi

    The Proceedings of Mechanical Engineering Congress, Japan   2014 ( 0 )   _J0210205 - -_J0210205-   2014

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    The metacarpophalangeal joint (MCP joint) is a diarthrodial joint that permits flexion and extension, abduction and adduction, and rotation (pronation and supination) of the proximal phalangeal base (PPB) on the metacarpal head (MCH). Determination of the distribution and magnitude of joint contact area is necessary to understanding the effects of loading on articular cartilage. For example, accurate assessment of MCP joint contact area is needed for various methods used to quantify joint stress such as mathematical modeling and finite element analysis. Traditionally, such data have been obtained from cadaver specimens. Recently, Magnetic Resonance Imaging (MRI) was shown to be a valid method of quantifying the joint contact area indicating the potential for in vivo assessment. In this study, MRI was used to quantify in vivo MCP joint contact area, contact distribution and joint motion. Eight males participated in this study. Cartilage-enhanced MR images were obtained at -30, 0, 45, 60 degrees finger flexion. This study highlights the differences in MCP joint contact area and joint motion between different finger flexion postures and geometries of joint surfaces.

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  • J0210204 Study on Proposal of Automatic Three-Dimensional Tooth Axis

    SAKAMOTO Makoto, KASUGA Yuto, HAYASHI-SAKAI Sachiko, KOBAYASHI Koichi, ENDO Hideaki

    The Proceedings of Mechanical Engineering Congress, Japan   2014 ( 0 )   _J0210204 - -_J0210204-   2014

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    The tooth axis is an important as a morphological reference axis; however general definition of the tooth axis has not been established. This study presented a novel method of automatically calculating three-dimensional teeth axes in micro-CT images. In this study, 20 teeth specimens were obtained from five incisors, canines, premolars and molars, respectively. X-ray images were obtained using a micro-CT scanner at a spatial resolution of 33×33×33μm^3. The tooth axis was calculated using a principal component (PC) analysis on the segmented soft pulp and dentin. The teeth axes of PC-A_+ and PC-A__ were defined as the including of the pulp and not, respectively. No significant differences were noted in the experimental results between PC-A_+ and PC-A__. In experimental results using 20 teeth, the average relative angular errors between the teeth axes T-A manually specified by five dentists and automatically calculated PC-A_+ by the proposed method were 1.14±0.11 deg for incisor, 1.74±0.74 deg for canine, 3.51±0.43 deg for premolar and 2.90±0.57 deg for molar, respectively.

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  • 回内・回外時の橈骨-尺骨間運動の3次元生体内解析

    風間清子, 風間清子, 春日勇人, 小林公一, 坂本信

    日本放射線技術学会雑誌   70 ( 9 )   2014

  • 車いすグリップ高さと移送介助者の上肢にかかる負荷の検討―坂路移送における関節モーメントの解析を通して

    水谷都, 川上健作, 坂本信, 定方美恵子, 小林公一

    日本看護科学学会学術集会講演集   33rd   580   2013.12

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  • For the Special Issue on "Orthopaedic Biomechanics"

    SAKAMOTO Makoto

    非破壊検査 : journal of N.D.I   62 ( 10 )   487 - 487   2013.10

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  • Message from the President of JSME

    SAKAMOTO Makoto

    実験力学 : journal of JSEM   13 ( 3 )   233 - 233   2013.9

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  • 看護師の臨床経験が眼球運動に及ぼす影響

    川合功, 坂本信, 定方美恵子, 西方真弓, 小林公一, 小浦方格, 笠井美香子, 井越寿美子, 佐藤富貴子, 西原亜矢子, 田邊裕治

    日本機械学会年次大会講演論文集(CD-ROM)   2013   ROMBUNNO.J024024   2013.9

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  • 関節の弾性接触に対する理論解

    坂本信, 小林公一

    日本機械学会年次大会講演論文集(CD-ROM)   2013   ROMBUNNO.J024044   2013.9

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  • MRIボリュームデータのレンダリングによる膝関節の3次元位置推定

    小林公一, 坂本信, 田邊裕治

    日本機械学会年次大会講演論文集(CD-ROM)   2013   ROMBUNNO.J024055   2013.9

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  • MRIボリュームデータのレンダリングによる膝関節の空間位置評価

    小林公一, 坂本信, 田邊裕治

    日本実験力学会講演論文集   ( 13 )   331 - 332   2013.8

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  • 近赤外分光法によるヒト関節軟骨の含水率の測定―ゼラチンモデルによる拡散反射法の有効性の検討―

    佐藤光, 田邊裕治, 菊池達哉, 坂本信, 小林公一

    日本実験力学会講演論文集   ( 13 )   337 - 342   2013.8

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  • マイクロCTを用いたヒト象牙質のミネラル密度の評価

    春日勇人, 坂井幸子, 近藤達也, 坂本信, 小林公一, 遠藤英昭

    日本実験力学会講演論文集   ( 13 )   317 - 321   2013.8

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  • 応力・ひずみ解析の活動報告と今後の展望

    坂本信, 坂本信

    非破壊検査   62 ( 8 )   368 - 373   2013.8

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  • 四肢専用MRI装置における手関節およびTFCC検査時のポジショニングについての検討

    風間清子, 近藤達也, 小林公一, 坂本信

    日本放射線技術学会総会学術大会予稿集   69th   301   2013.2

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  • 力学モデルを用いた関節の接触解析

    坂本信, 小林公一

    応力・ひずみ測定と強度評価シンポジウム講演論文集   44th   1 - 6   2013.1

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  • 骨・軟骨形状モデルによる膝関節の接触評価法

    小林公一, 坂本信, 田邊裕治

    応力・ひずみ測定と強度評価シンポジウム講演論文集   44th   7 - 10   2013.1

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  • 膝蓋骨トラッキングの生体内測定と有限要素法による膝蓋大腿関節の接触解析

    小林公一, LI Guoan, 坂本信

    バイオエンジニアリング講演会講演論文集   25th   293 - 294   2013.1

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  • MRIを用いた膝屈曲に伴う膝関節運動と後十字靱帯長さの生体内解析

    近藤達也, 坂本信, 吉田秀義, 小林公一

    バイオエンジニアリング講演会講演論文集   25th   291 - 292   2013.1

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  • 2B11 Finite element patellofemoral contact analysis coupled with in vivo patellar tracking measurement

    KOBAYASHI Koichi, LI Guoan, SAKAMOTO Makoto

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2013 ( 0 )   293 - 294   2013

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  • J024044 A Theoretical Solution for the Elastic Contact of the Joint

    SAKAMOTO Makoto, KOBAYASHI Koichi

    The Proceedings of Mechanical Engineering Congress, Japan   2013 ( 0 )   _J024044 - 1-_J024044-4   2013

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    Articular cartilage provides joints with low friction and wear resistance essential for repetitive gliding motion and shock absorption, while evenly spreading the applied load onto the underlying bone. Mechanical factors are strongly implicated in the development of osteoarthritis, although the exact mechanisms are still not known. To aid in understanding whether mechanical factors are primary or secondary in the evolution of the degeneration of joint, knowledge of the contact stress distribution on the joint surface is needed. In this study, the static stress distribution on the surface of contact of two rigid spheres coated with elastic layers is estimated utilizing a mechanical model to simulate a diarthrodial joint. The problem is equivalent to the mixed boundary-value problem of the three-dimensional theory of elasticity. The dual integral equations are reduced to infinite systems of simultaneous equations by using the technique of expanding the normal contact stress with infinite series. The exact and complete analytical solution of contact stress is obtained. Numerical results are obtained with indication of the effect of the cartilage layer thickness, elastic modulus, Poisson&#039;s ratio and joint conformity on the contact stress distribution.

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  • J024055 Estimation of 3D position of knee joint by MRI volume data rendering

    KOBAYSHI Koichi, SAKAMOTO Makoto, TANABE Yuji

    The Proceedings of Mechanical Engineering Congress, Japan   2013 ( 0 )   _J024055 - 1-_J024055-4   2013

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    A method for estimating three dimensional (3D) position of knee joint in vivo was presented. Volume data of a knee joint were generated using magnetic resonance imaging (MRI) scanning of the knee. The volume data was rendered as the mean voxel values along the ray drawn from the focal point to each pixel of the image plane. The 3D positions of the femur and tibia were recovered by matching the rendered image with calibrated bi-plane x-ray images of the knee. To validate this method, in vitro experiments were carried out using a cadaveric knee. To define the local coordinate systems, 4 polymeric markers containing contrast media were attached to the femur and the tibia, respectively. The knee underwent MRI scan to generate volume data. Then, bi-plane x-ray images of the knee were taken at 2 different flexion angles. The relative position (6 degree-of-freedom parameters) between the femur and tibia was compared with that measured using a 3D coordinate measuring machine. The maxi-mum errors of the rotation and translation parameters were about 3.2° and 10.9 mm.

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  • 8-339 Development of Nursing-Engineering Research and Its Education

    SAKAMOTO Makoto, TANABE Yuji, SADAKATA Mieko, KASAI Mikako, IKOSHI Sumiko, SATO Fukiko

    Proceedings of Annual Conference of JSEE   2013 ( 0 )   662 - 663   2013

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  • 2B10 In vivo analysis of the knee joint motion and the posterior cruciate ligament length during knee flexion using MRI

    KONDO Tatsuya, SAKAMOTO Makoto, YOSHIDA Hidenori, KOBAYASHI Koichi

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2013 ( 0 )   291 - 292   2013

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  • 3-101 Current Status and Issues on Engineering Education in Collaborative Research Work between Clinicians and Engineers

    TANABE Yuji, Jonas A, PRAMUDITA, SAKAMOTO Makoto, KOBAYASHI Koichi, OMORI Go, KOGA Yoshio

    Proceedings of Annual Conference of JSEE   2013 ( 0 )   46 - 47   2013

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  • J024024 Effects of Clinical Experiences on Eye Movements of Nurses

    KAWAI Ko, NISHIHARA Ayako, TANABE Yuji, SAKAMOTO Makoto, SADAKATA Mieko, NISHIKATA Mayumi, KOBAYASHI Koichi, KOURAKATA Itaru, KASAI Mikako, IKOSHI Sumiko, SATO Fukiko

    The Proceedings of Mechanical Engineering Congress, Japan   2013 ( 0 )   _J024024 - 1-_J024024-4   2013

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    Practical clinical skills lie at the heart of nurses&#039; professional practice. Therefore, the mastery of fundamental clinical skills is an important component of courses leading to registration. Thus, the assessment of novice nurses&#039; clinical skills is of great importance. Unfortunately, the assessment of practical skills is very complex. Eye tracking measuring systems are typically used to record visual scanning data, which can provide insights into the visual, cognitive, and attention aspects of human performance. The purpose of this study was to clarify the effects of clinical experiences on eye movements of novice and veteran nurses at pictures of sickroom. The gaze duration of nurse was measured by the eye tracking system. It was clear that the gaze duration of the veteran nurse was longer than that of the novice nurse.

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  • 臨床力と研究力を融合できる大学院教育 : 臨床力と研究力のダブルストランドで織りなす高度専門医療職教育

    坂本 信, 定方 美恵子, 渡邉 タミ子, 住吉 智子, 藤原 直士, 平野 茂樹, 佐井 篤儀, 鈴木 力, Sakamoto Makoto, Sadakata Mieko, Watanabe Tamiko, Sumiyoshi Tomoko, Fujiwara Naoshi, Hirano Shigeki, Tsai Du-Yih, Suzuki Tsutomu

    新潟大学高等教育研究   1 ( 1 )   41 - 46   2013

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    本教育プログラムは平成22年度~24年度(予定)において, 大学院保健学研究科で実施している取組である. 本取組の主な目的は, 看護系大学院生のキャリア形成に対応する教育プログラムを実施し, さらに, 放射線・検査技術科学分野ヘの展開を図り, 臨床の現場に学び, 臨床の課題を研究する医療技術者の育成プログラムを構築することである. また, 臨床経験や実務経験をもつ社会人入学者が, 博士前期課程で体系的・網羅的研究技能を身につけ, 自ら臨床の課題を見出し,研究を進める後期課程のリサーチワークにつなげるプログラムを構築することである. 本報では, 本組織的教育プログラムの概要と平成22年度で行ったその活動成果について報告する.

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  • 学生と教員が学び鍛えあう保健学教育 : 専門性を理解しあいインタラクティブに学ぴ鍛えあう保健学教育

    平野 茂樹, 村松 芳幸, 坂本 信, 藤原 直士, 定方 美恵子, 齋藤 君枝, 住吉 智子, 山崎 芳裕, 富山 智香子, 伊藤 斎, 佐々木 孝一, 蒲生 実

    新潟大学高等教育研究   1 ( 1 )   29 - 34   2013

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    平成22年度新潟大学組織的教育プログラム(新潟大学GP)に医学部保健学科の取組「学生と教員が学ぴ鍛えあう保健学教育」が採択された。医療を支える使命感と能力をもち, チーム医療に対応できる人材の育成をめざす2つの授業プロジェクト「My confident lecture (腕によりをかけた授業)」および「Our project study (私たちのプロジェクト学習)」をカリキュラムに位置付けようとするものである。平成22年度はこれらの授業プロジェクトを具体化する作業を行い, My confident lecture を科目名「保健学総合」として平成23年度から, また, Our project study を科目名「保健学総合演習」として平成24年度から開講する道筋を示した。その活動内容について, 取組を推進する体制を含めて紹介する。

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  • 8-215 A Newly Developed Research Project at Smart Dormitory : Knowledge and Technical Skills Learnt from Interdisciplinary Nursing/Engineering Research

    SUGIYAGI Takaaki, KAWAI Ko, TANABE Yuji, SAKAMOTO Makoto, SADAKATA Mieko

    Proceedings of Annual Conference of JSEE   2013 ( 0 )   444 - 445   2013

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  • 看護師の臨床経験が視線運動に及ぼす影響

    坂本信, 定方美恵子, 西方真弓, 中澤紀代子, 小浦方格, 小林公一, 田邊裕治, 笠井美香子, 井越寿美子, 佐藤富貴子

    日本非破壊検査協会講演大会講演概要集   2012   97 - 98   2012.10

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  • 後十字靭帯の生体内長さ変化の解析

    近藤達也, 坂本信, 吉田秀義, 小林公一

    日本非破壊検査協会講演大会講演概要集   2012   99 - 100   2012.10

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  • 皮膚マーカと大腿骨および脛骨との相対誤差評価

    小林公一, 坂本信, 川上健作

    日本非破壊検査協会講演大会講演概要集   2012   101 - 104   2012.10

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  • 1方向正面動画による歩行解析

    川上健作, 小林公一, 坂本信

    日本機械学会バイオフロンティア講演会講演論文集   23rd   67 - 68   2012.10

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  • MRIによるヒト膝蓋腱のひずみの生体内測定

    坂本信, 小林公一

    日本機械学会年次大会講演論文集(CD-ROM)   2012   ROMBUNNO.J022025   2012.9

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  • イメージレジストレーションによる膝関節接触機構評価法の実験的検証

    小林公一, 豊田貴嗣, 坂本信, 田邊裕治

    日本機械学会年次大会講演論文集(CD-ROM)   2012   ROMBUNNO.S022026   2012.9

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  • 1.5T‐MRIによる距骨および踵骨海綿骨の生体内構造解析

    坂本信, 小林公一, 吉田秀義

    Osteoporosis Jpn   20   290   2012.8

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  • Review on Stress/Strain Measurement

    SAKAMOTO Makoto

    非破壊検査 : journal of N.D.I   61 ( 8 )   370 - 375   2012.8

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  • Review on Stress/Strain Measurement

    坂本 信

    非破壊検査   61 ( 8 )   370 - 375   2012.8

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  • MRIを用いた膝屈曲に伴う膝蓋骨運動と膝蓋腱長さの生体内解析

    坂本信, 小林公一, 吉田秀義

    日本実験力学会講演論文集   ( 12 )   165 - 169   2012.7

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  • 2方向X線画像と3次元骨形状モデルを用いた皮膚マーカの誤差評価

    小林公一, 川上健作, 坂本信

    日本実験力学会講演論文集   ( 12 )   170 - 171   2012.7

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  • イメージマッチングよる膝関節軟骨接触評価法の実験的検証:CT骨モデルとMRI骨モデルの比較

    小林公一, 坂本信, 豊田貴嗣, 田邊裕治, 川上健作

    日本非破壊検査協会講演大会講演概要集   2012   145 - 146   2012.5

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  • ヒト後十字靭帯のMRIを用いた生体内変形測定

    近藤達也, 坂本信, 小林公一, 吉田秀義, 川上健作

    日本非破壊検査協会講演大会講演概要集   2012   147 - 148   2012.5

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  • イメージマッチングによる膝関節接触評価法の実験的検証

    豊田貴嗣, 小林公一, 坂本信, 川上健作, 田邊裕治

    日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM)   49th   ROMBUNNO.1208   2012.3

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  • MRIを用いた腕橈関節の接触領域評価

    牧岡諒太, 吉田秀義, 田邊裕治, 川上健作, 小林公一, 坂本信

    日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM)   49th   ROMBUNNO.1207   2012.3

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  • 前額面動画による歩行解析

    川上健作, 小林公一, 坂本信

    応力・ひずみ測定と強度評価シンポジウム講演論文集   43rd   25 - 28   2012.1

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  • イメージマッチングによる膝関節接触評価法の実験的検証

    小林公一, 坂本信, 川上健作, 豊田貴嗣, 田邊裕治

    応力・ひずみ測定と強度評価シンポジウム講演論文集   43rd   33 - 36   2012.1

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  • Magnetic Resonance Imagingを用いたヒト膝蓋腱長さ変化の生体内解析

    坂本信, 長田郁美, 吉田秀義, 川上健作, 小林公一

    バイオエンジニアリング講演会講演論文集   24th (CD-ROM)   ROMBUNNO.7A16   2012.1

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  • 1208 Validation of the image matching technique for measuring in vivo articular contact of knee

    TOYODA Takatsugu, KOBAYASHI Koichi, SAKAMOTO Makoto, KAWAKAMI Kensaku, TANABE Yuji

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2012 ( 0 )   120801 - 120802   2012

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  • In Vivo Evaluation of Articular Contact Behavior of Knee Joint

    小林 公一, 坂本 信, 近藤 達也

    日本実験力学会講演論文集   ( 11 )   30 - 33   2012

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  • In vivo analysis of the patellar motion and patellar tendon elongation during knee flexion using MRI

    坂本 信, 近藤 達也, 小林 公一

    日本実験力学会講演論文集   ( 11 )   25 - 29   2012

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  • 3次元下肢アライメント評価法を基にした人工股関節設置位置支援法の開発

    中部昇, 古賀良生, 小林公一, 坂本信, 遠藤直人, 湊泉, 田邊祐治, 大森豪, 落合清秀

    日本股関節学会学術集会プログラム・抄録集   39th   488   2012

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  • 臼蓋カップ設置におけるジグ連携型術前計画システムによる術中支援の精度検証

    ツチンダ ハリット, 古賀良生, 湊泉, 遠藤直人, 坂本信, 大森豪, 解晨, 田邊裕治

    日本股関節学会学術集会プログラム・抄録集   39th   488   2012

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  • Patient‐specificモデルによる股関節動作解析

    解晨, 湊泉, 古賀良生, 佐藤卓, 坂本信, 大森豪, 田邊裕治

    日本股関節学会学術集会プログラム・抄録集   39th   208   2012

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  • An in vivo analysis of the patellar motion and patellar tendon length during knee flexion using MRI

    坂本 信, 小林 公一, 吉田 秀義

    日本実験力学会講演論文集   ( 12 )   165 - 169   2012

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  • S022026 Validation of In Vivo Evaluation of Contact Mechanics of Knee Joint Using Image Registration

    KOBAYASHI Koichi, TOYODA Takatsugu, SAKAMOTO Makoto, TANABE Yuji

    The Proceedings of Mechanical Engineering Congress, Japan   2012 ( 0 )   _S022026 - 1-_S022026-3   2012

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    The purpose of this study was to validate the cartilage contact behavior in the tibiofemoral joint evaluated using an image matching technique. Two human cadaveric knees were used for this study. Each knee underwent CT scanning to create 3D femoral and tibial bone models and MR imaging to create 3D femoral and tibial cartilage layer models. Tactile pressure sensors were inserted into the medial and lateral compartments of the knee. Calibrated biplane radiographic images of the cadaver knee were obtained during axially loaded using a lever arm apparatus. The 3D positions of the femoral and tibial bone models were recovered by matching their projected outlines with the bone contours in biplane radiographs. The contact area and contact depth were determined from the intersection of the femoral and tibial cartilage layer models. The proximity was obtained between the femoral and tibial bone models. The location of the contact area corresponded to that measured with the pressure sensors. The distributions of contact depth and the proximity also corresponded to the pressure distribution. These data indicate that the image registration technique could be used to evaluate the in vivo articular cartilage contact behavior of the knee joints.

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  • J022025 In Vivo Measurements of the Human Patellar Tendon Strain Using MRI

    SAKAMOTO Makoto, KOBAYASHI Koichi

    The Proceedings of Mechanical Engineering Congress, Japan   2012 ( 0 )   _J022025 - 1-_J022025-5   2012

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    The mechanical characteristics of the patellar tendon are primarily derived from cadaver studies, which may not necessarily be applicable to the human patellar tendon, in vivo; however, recent developments in high-resolution magnetic resonance imaging (MRI) techniques have opened up new perspectives for structural characteristics of the tendon and ligament by non-invasive methods. The purpose of this study is to use MRI to quantity the elongation and the strain of the human patellar tendon in vivo during full extension to 60° of knee flexion. The apparent elongation in the lateral-central (lc) portion of the patellar tendon was slightly less than in the central (c) and medial-central (mc) portions with knee flexion. The apparent mean-central strains (mnc = (c + mc + lc) / 3) of the patellar tendons, which corresponded to strains in the central one-third portions of patellar tendons, were (average and standard deviation) 0.091 ± 0.034 and 0.135 ± 0.007 at 30° and 60° of the knee flexion, respectively.

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  • 7A16 An In Vivo Analysis of the Human Patellar Tendon Length Change Using Magnetic Resonance Imaging

    SAKAMOTO Makoto, OSADA Ikumi, YOSHIDA Hidenori, KAWAKAMI Kensaku, KOBAYASHI Koichi

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2012 ( 0 )   _7A16 - 1_-_7A16-2_   2012

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  • 1207 Estimation of contract areas in radiohumeral joint using MRI.

    MAKIOKA Ryota, YOSHIDA Hidenori, TANABE Yuji, KAWAKAMI Kensaku, KOBAYASHI Kouichi, SAKAMOTO Makoto

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2012 ( 0 )   120701 - 120702   2012

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  • B211 Motion analysis after total hip arthroplasty using patient-specific model

    Kai Shin, Hongo Kasumi, Minato Izumi, Koga Yoshio, Sato Takashi, Sakamoto Makoto, Tanabe Yuji

    The Proceedings of the JSME Conference on Frontiers in Bioengineering   2012 ( 0 )   147 - 148   2012

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  • C103 Gait Analysis using One Direction Frontal Video Image

    Kawakami Kensaku, Kobayashi Koichi, Sakamoto Makoto

    The Proceedings of the JSME Conference on Frontiers in Bioengineering   2012 ( 0 )   67 - 68   2012

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  • Biomechanics Division

    SAKAMOTO Makoto, ENDO Hideaki

    実験力学 : journal of JSEM   11 ( 4 )   348 - 349   2011.12

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  • 平成23年度 第2回 応力・ひずみ測定部門講演会開催報告

    坂本 信

    非破壊検査 : journal of N.D.I   60 ( 12 )   2011.12

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  • バイオメカニクスにおける新たな計測技術 海綿骨のMRIによる構造解析

    坂本信

    非破壊検査   60 ( 11 )   653 - 657   2011.11

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  • Structural Analysis of Trabecular Bone Using MRI

    SAKAMOTO Makoto

    非破壊検査 : journal of N.D.I   60 ( 11 )   653 - 657   2011.11

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  • 新人看護師の‘観察・判断力’を育てる教育プログラムの開発(2)―視線運動測定結果からの気づきの分析―

    定方美恵子, 中澤紀代子, 西方真弓, 西原亜矢子, 牧岡諒太, 坂本信, 井越寿美子, 笠井美香子, 佐藤富貴子

    医療の質・安全学会誌   6 ( Supplement )   155   2011.10

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  • 新人看護師の‘観察・判断力’を育てる教育プログラムの開発(1)―視線運動測定による注視時間の変化―

    笠井美香子, 定方美恵子, 牧岡諒太, 坂本信, 中澤紀代子, 井越寿美子, 小浦方格, 田邊裕治, 佐藤富貴子

    医療の質・安全学会誌   6 ( Supplement )   154   2011.10

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  • イメージマッチングによる膝関節接触状態評価法の実験的検証

    豊田貴嗣, 小林公一, 坂本信, 大森豪, 古賀良生, 田邊裕治

    臨床バイオメカニクス   32   483 - 487   2011.10

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  • 大腿骨および脛骨骨形状コンピュータモデルの座標系自動構築法

    解晨, 坂本信, 小林公一, 古賀良生, 佐藤卓, 田邊裕治

    日本非破壊検査協会講演大会講演概要集   2011   65 - 68   2011.10

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  • 膝深屈曲時における膝蓋大腿関節と膝蓋腱のキネマティクス

    小林公一, 坂本信, LI Guoan

    日本非破壊検査協会講演大会講演概要集   2011   81 - 84   2011.10

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  • MRIによるヒト膝蓋腱長さ変化の生体内測定

    坂本信, 長田郁美, 小林公一, 川上健作

    日本非破壊検査協会講演大会講演概要集   2011   57 - 60   2011.10

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  • 透過型近赤外分光法によるヒト関節軟骨含水率の定量的評価

    山岸英大, 田邊裕治, 佐藤光, 坂本信, 菊池達哉, 古賀良生

    日本非破壊検査協会講演大会講演概要集   2011   85 - 88   2011.10

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  • 平成23年度 第1回応力・ひずみ測定部門講演会開催報告

    坂本 信

    非破壊検査 : journal of N.D.I   60 ( 10 )   2011.10

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  • 歯内部への咬合力伝播に歯髄の存在が与える影響

    遠藤英昭, 佐々木具文, 伊藤秀美, 島内英俊, 小松正志, 坂本信

    日本実験力学会講演論文集   ( 11 )   275 - 277   2011.8

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  • ヒト膝蓋腱のMRIによる生体内におけるひずみ解析

    坂本信, 長田郁美, 川上健作, 吉田秀義, 小林公一

    日本実験力学会講演論文集   ( 11 )   282 - 286   2011.8

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  • 大腿骨および脛骨骨形状コンピュータモデルの座標系自動構築法

    解晨, 古賀良生, 佐藤卓, 坂本信, 田邊裕治

    日本実験力学会講演論文集   ( 11 )   271 - 274   2011.8

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  • 人工股関節摺動面における応力分布の数値解析

    KAI Shin, 坂本信, 小林公一, 西野勝敏, 湊泉, 古賀良生, 佐藤卓, 田邊裕治

    日本非破壊検査協会講演大会講演概要集   2011   193 - 196   2011.5

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  • デジタル画像相関法を用いた皮質骨組織の微小変形測定

    近藤達也, 坂本信, 小林公一, 田邊裕治, 笹川圭右

    日本非破壊検査協会講演大会講演概要集   2011   173 - 176   2011.5

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  • ヒト膝蓋腱の生体内における変形測定

    長田郁美, 坂本信, 小林公一

    日本非破壊検査協会講演大会講演概要集   2011   185 - 188   2011.5

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  • 看護観察場面における看護師の視線運動―臨床経験の差異による比較―

    笠井美香子, 定方美恵子, 井越寿美子, 佐藤富貴子, 伊藤千恵美, 広川佐代子, 田中京子, 中澤紀代子, 坂本信, 牧岡涼太, 小浦方格, 窪田陽介, 田辺裕治, 青木萩子, 関井愛紀子, 内山美枝子, 後藤雅博

    日本看護学会論文集 看護管理   41st   177 - 180   2011.5

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  • 人工股関節摺動面における応力分布の数値解析

    解晨, 坂本信, 湊泉, 古賀良生, 佐藤卓, 小林公一, 田邊裕治

    バイオエンジニアリング講演会講演論文集   23rd   229 - 230   2011.1

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  • 下肢アライメント評価法におけるMRIの影響

    笹川圭右, 小林公一, 坂本信, 田邊裕治, 古賀良生

    バイオエンジニアリング講演会講演論文集   23rd   563 - 564   2011.1

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  • 脛距関節における接触面積の生体内評価

    坂本信, 牧岡涼太, 笹川圭右, 田邊裕治, 吉田秀義, 小林公一

    バイオエンジニアリング講演会講演論文集   23rd   37 - 38   2011.1

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  • イメージマッチングによる人工股関節ステム挿入管理法の開発

    窪田陽介, 坂本信, 小林公一, 古賀良生, 田邊裕治, 湊泉

    バイオエンジニアリング講演会講演論文集   23rd   41 - 42   2011.1

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  • MRIを用いたヒト膝蓋腱の生体内伸長測定

    坂本信, 長田郁美, 風間清子, 笹川圭右, 田邊裕治, 吉田秀義, 小林公一

    バイオエンジニアリング講演会講演論文集   23rd   225 - 226   2011.1

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  • 9F-16 Influence of Clinical Experience on Eye Movement of Nurse

    MAKIOKA Ryota, NAKAZAWA Kiyoko, SADAKATA Mieko, KASAI Mikako, IGOSHI Sumiko, SATO Tokiko, KOURAKATA Itaru, TANABE Yuji, SAKAMOTO Makoto

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2010 ( 0 )   543 - 544   2011

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    DOI: 10.1299/jsmebio.2010.23.543

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  • 9F-16 Influence of Clinical Experience on Eye Movement of Nurse

    MAKIOKA Ryota, NAKAZAWA Kiyoko, SADAKATA Mieko, KASAI Mikako, IGOSHI Sumiko, SATO Tokiko, KOURAKATA Itaru, TANABE Yuji, SAKAMOTO Makoto

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2010 ( 0 )   543 - 544   2011

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    DOI: 10.1299/jsmebio.2010.23.543

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  • 8C-04 Development of a Controlling Stem Setting of Total Hip Arthroplasty by Image Matching

    KUBOTA Yosuke, SAKAMOTO Makoto, KOBAYASHI Koichi, KOGA Yoshio, TANABE Yuji, MINATO Izumi

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2010 ( 0 )   41 - 42   2011

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  • In vivo strain analysis of human patellar tendon using MRI

    坂本 信, 長田 郁美, 川上 健作

    Proceedings of JSEM   ( 11 )   282 - 286   2011

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  • 9H-15 Influence of MRI for Three-Dimensional Lower Extremity Alignment Assessment

    Sasagawa Keisuke, Kobayashi Koichi, Sakamoto Makoto, Tanabe Yuji, Koga Yoshio

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2010 ( 0 )   563 - 564   2011

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  • 8C-18 Numerical Analysis of Contact Stress on the Bearing Surface after THA

    KAI Shin, SAKAMOTO Makoto, MINATO Izumi, KOGA Yoshio, SATO Takashi, KOBAYASHI Koichi, TANABE Yuji

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2010 ( 0 )   229 - 230   2011

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  • 8C-16 In Vivo Measurement of Elongation of Human Patellar Tendon Using MRI

    SAKAMOTO Makoto, OSADA Ikumi, KAZAMA Kiyoko, SASAGAWA Keisuke, TANABE Yuji, YOSHIDA Hidenori, KOBAYASHI Koichi

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2010 ( 0 )   225 - 226   2011

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  • 8C-02 In Vivo Estimation of Tibiotalar Joint Contact Area

    SAKAMOTO Makoto, MAKIOKA Ryota, SASAGAWA Keisuke, TANABE Yuji, YOSHIDA Hidenori, KOBAYASHI Koichi

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2010 ( 0 )   37 - 38   2011

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  • 人工股関節摺動面における応力分布の数値解析

    解晨, 坂本信, 小林公一, 湊泉, 古賀良生, 田邊裕治

    日本機械学会バイオフロンティア講演会講演論文集   21st   81 - 82   2010.11

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  • 近赤外光透過法による関節軟骨含水率の測定

    田邊裕治, 菊池達哉, 山岸英大, 坂本信, 小林公一, 古賀良生, 笹川圭右

    日本非破壊検査協会講演大会講演概要集   2010   189 - 192   2010.10

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  • ヒト脛距関節におけるMRIによる関節接触面積の生体内評価

    坂本信, 笹川圭右, 田邊裕治, 小林公一

    日本機械学会M&amp;M材料力学カンファレンス(CD-ROM)   2010   ROMBUNNO.1303   2010.10

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  • 歯根破折の原因追究―歯冠部の欠損が根管に与える影響―

    遠藤英昭, 佐々木具文, 伊藤秀美, 島内英俊, 小松正志, 坂本信

    日本実験力学会講演論文集   ( 10 )   52 - 54   2010.8

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  • MRIによる脛距関節における接触面積のIn Vivo評価

    坂本信, 牧岡諒太, 笹川圭右, 田邊裕治, 吉田秀義, 小林公一

    日本実験力学会講演論文集   ( 10 )   34 - 37   2010.8

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  • MRIを用いた手関節運動の3次元解析

    笹川圭右, 坂本信, 吉田秀義, 小林公一, 田邊裕治

    日本実験力学会講演論文集   ( 10 )   55 - 57   2010.8

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  • 鏡映像イメージマッチングによる人工股関節ステム設置法の開発

    窪田陽介, 坂本信, 小林公一, 古賀良生, 田邊裕治

    日本実験力学会講演論文集   ( 10 )   38 - 40   2010.8

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  • 4th ISEM '09-Niigata (The 4th International Symposium on Advanced Fluid/Solid Science and Technology in Experimental Mechanics) 開催報告

    坂本 信

    実験力学 : journal of JSEM   10 ( 1 )   126 - 126   2010.3

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  • ヒト関節接触領域の生体内解析

    坂本信

    トライボロジスト   55 ( 3 )   166 - 171   2010.3

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  • 距骨および踵骨のMRIを用いた3次元骨梁構造解析

    坂本信, 笹川圭右, 小林公一

    日本機械学会北陸信越支部総会・講演会講演論文集   47th   339 - 340   2010.3

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  • 膝骨幹端モデルによる立位下肢状態解析の精度検証

    笹川圭右, 小林公一, 坂本信, 田邊裕治, 古賀良生

    日本機械学会北陸信越支部総会・講演会講演論文集   47th   343 - 344   2010.3

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  • イメージレジストレーションによる膝関節の生体内接触挙動評価

    小林公一, 小田川健一, 豊田貴嗣, 坂本信, 田邊裕治

    日本機械学会北陸信越支部総会・講演会講演論文集   47th   341 - 342   2010.3

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  • 3面鏡を用いた2D‐3Dイメージレジストレーション法の開発

    窪田陽介, 坂本信, 小林公一, 古賀良生, 田邊裕治, 湊泉

    日本機械学会北陸信越支部総会・講演会講演論文集   47th   345 - 346   2010.3

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  • 2方向X画像による脊椎3次元アライメント評価の精度についての基礎的検討

    風間清子, 小林公一, 笹川圭右, 弦巻正樹, 坂本信

    日本放射線技術学会総会学術大会予稿集   66th   318   2010.2

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  • イメージレジストレーションによる大腿脛骨関節の運動力学解析

    小田川健一, 豊田貴嗣, 小林公一, 坂本信, 田邊裕治

    バイオエンジニアリング講演会講演論文集   22nd   162   2010.1

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  • MRIによるヒト海綿骨の生体内骨梁構造解析

    坂本信, 笹川圭右, 小林公一

    バイオエンジニアリング講演会講演論文集   22nd   52   2010.1

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  • イメージマッチングによる人工股関節ステム設置管理法の精度検証

    窪田陽介, 坂本信, 小林公一, 古賀良生, 田邊裕治, 湊泉

    バイオエンジニアリング講演会講演論文集   22nd   337   2010.1

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  • 膝骨幹端モデルによる立位下肢状態の3次元評価

    笹川圭右, 小林公一, 坂本信, 田邊裕治, 古賀良生

    バイオエンジニアリング講演会講演論文集   22nd   153   2010.1

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  • 人工股関節のソケット関節面における応力分布の数値解析

    解晨, 坂本信, 小林公一, 湊泉, 古賀良生, 田邊裕治

    バイオエンジニアリング講演会講演論文集   22nd   338   2010.1

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  • ヒト脛距関節における接触面積の生体内評価

    野田口洋成, 牧岡諒太, 吉田秀義, 田邊裕治, 小林公一, 坂本信

    バイオエンジニアリング講演会講演論文集   22nd   273   2010.1

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  • In Vivo Analysis of Contact Areas in Human Joints Reviewed

    Makoto Sakamoto

    JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS   55 ( 3 )   166 - 171   2010

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  • 916 Three-dimensional Structural Analysis of Talar and Calcaneal Trabecular Bone Using Magnetic Resonance Imaging

    SAKAMOTO Makoto, SASAGAWA Keisuke, KOBAYASHI Koichi

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2010 ( 0 )   339 - 340   2010

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  • A222 Numerical Analysis of Contact Pressure on Cup Surface after THA

    KAI Shin, SAKAMOTO Makoto, KOBAYASHI Koichi, MINATO Izumi, KOGA Yoshio, TANABE Yuji

    The Proceedings of the JSME Conference on Frontiers in Bioengineering   2010 ( 0 )   81 - 82   2010

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  • 1303 In Vivo Estimation of Human Tibiotalar Joint Contact Area Using MRI

    SAKAMOTO Makoto, SASAGAWA Keisuke, TANABE Yuji, KOBAYASHI Koichi

    The Proceedings of the Materials and Mechanics Conference   2010 ( 0 )   354 - 355   2010

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    The ankle joint complex connects the foot and leg, and consists of the tibiotalar, fibulotalar, and distal tibiofibular joints. The compressive force on the ankle joint is approximately two to five times body weight during gait cycle. Contact characteristics have been extensively studied in joints such as the knee and hip; however, there is relatively liffle information available for the ankle joint. In this study, in vivo contact areas of tibiotalar joints in 20 healthy subjects were studied using a loading device within a closed-MRI system Cartilage-enhanced, sagittal images were obtained at 10° of dorsiflexion, and 0° and 10° of plantarflexion under 200 N ankle-loaded conditions. For ankle-unloaded conditions, the anlde was positioned at 10° of dorsiflexion, and 0°, 10°, 30°, and 50° of plantarfiexion. This study highlights the differences in tibiotalar joint contact area between different ankle flexion postures, loading conditions, and geometries of joint surfaces.

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  • 0926 Numerical Analysis of Contact pressure on Cup Surface of THA

    KAI Shin, SAKAMOTO Makoto, KOBAYASHI Koichi, MINATO Izumi, KOGA Yoshio, TANABE Yuji

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2009 ( 0 )   338 - 338   2010

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  • 0925 Accuracy of Controlling Stem Setting of Total Hip Arthroplasty by Image Matching

    窪田 陽介, 坂本 信, 小林 公一, 古賀 良生, 田邊 裕治, 湊 泉

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2009 ( 0 )   337 - 337   2010

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  • 0516 In Vivo Estimation of Contact Area of Human Tibiotalar Joint

    NODAGUCHI Yosei, MAKIOKA Ryota, YOSHIDA Hidenori, TANABE Yuji, KOBAYASHI Koichi, SAKAMOTO Makoto

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2009 ( 0 )   273 - 273   2010

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  • 0920 Kinetic Analysis of Tibiofemoral Joint Using Image Registration Technique

    ODAGAWA Kenichi, TOYODA Takatsugu, KOBAYASHI Koichi, SAKAMOTO Makoto, TANABE Yuji

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2009 ( 0 )   162 - 162   2010

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  • 0911 Three-Dimensional Evaluation of Lower Extremity Alignment Using knee Metaphysis Bone Model

    Sasagawa Keisuke, Kobayashi Koichi, Sakamoto Makoto, Tanabe Yuji, Koga Yoshio

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2009 ( 0 )   153 - 153   2010

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  • 0322 In Vivo Analysis of Human Trabecular Bone Structure Using MRI

    SAKAMOTO Makoto, SASAGAWA Keisuke, KOBAYASHI Koichi

    The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME   2009 ( 0 )   52 - 52   2010

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  • 917 In vivo assessment of articular contact behavior of knee joint using image registration technique

    KOBAYASHI Koichi, ODAGAWA Kenichi, TOYODA Takatsugu, SAKAMOTO Makoto, TANABE Yuji

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2010 ( 0 )   341 - 342   2010

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  • 918 Accuracy Examination of Lower Extremity Conditions Analysis using Knee Metaphysis Bone Model

    SASAGAWA Keisuke, KOBAYASHI Koichi, SAKAMOTO Makoto, TANABE Yuji, Koga Yoshio

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2010 ( 0 )   343 - 344   2010

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  • Numerical analysis of contact pressure on cup surface of THA

    解 晨, 坂本 信, 小林 公一

    Proceedings of JSEM   ( 10 )   37 - 39   2010

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  • Effects of the geometry of joint surfaces on the contact areas of the tibiotalar joints

    坂本 信, 牧岡 諒太, 笹川 圭右

    Proceedings of JSEM   ( 10 )   32 - 36   2010

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  • Three-dimensional analysis for wrist joint during wrist motion

    笹川 圭右, 坂本 信, 吉田 秀義

    Proceedings of JSEM   ( 10 )   55 - 57   2010

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  • Development of controlling stem setting of stem of total hip arthroplasty using mirror image matching

    窪田 陽介, 坂本 信, 小林 公一

    Proceedings of JSEM   ( 10 )   38 - 40   2010

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  • In vivo assessment of tibiotalar joint contact area using MRI

    坂本 信, 牧岡 諒太, 笹川 圭右

    Proceedings of JSEM   ( 10 )   34 - 37   2010

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  • 919 Development of 2D-3D image-registration method using a triple mirror

    KUBOTA Yosuke, SAKAMOTO Makoto, KOBAYASHI Koichi, Koga Yoshio, TANABE Yuji, MINATO Izumi

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2010 ( 0 )   345 - 346   2010

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