Faculty Profiles - KOBAYASHI Koichi

Papers - KOBAYASHI Koichi

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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. 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

Language：English Publishing type：Research paper (scientific journal)

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.

DOI： 10.1186/s40634-020-00297-9

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Articular surface of the medial proximal tibia is aligned parallel to the ground in three-dimensional space under weight-bearing conditions in healthy and varus osteoarthritic knees. International journal

Tomoharu Mochizuki, Yoshio Koga, Takahiro Mori, Katsutoshi Nishino, Koichi Kobayashi, Osamu Tanifuji, Takashi Sato, Ryota Katsumi, Hiroshi Koga, Go Omori, Yuji Tanabe

Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA 28 ( 10 ) 3232 - 3239 2020.10

Language：English Publishing type：Research paper (scientific journal)

PURPOSE: To test the hypothesis that an inclined articular surface on the medial proximal tibia is aligned more parallel to the ground in three-dimensional (3D) space under weight-bearing (WB) conditions (parallel phenomenon) than under non-WB (NWB) conditions in healthy and varus osteoarthritic knees. METHODS: We examined 55 healthy knees (26 women, 29 men; mean age, 70 ± 6 years) and 108 varus osteoarthritic knees (66 women, 16 men; mean age, 74 ± 7 years). For the evaluation under WB conditions, a 3D assessment system was used on biplanar long-leg radiographs and 3D bone models using a 3D-to-2D image registration technique. In addition, the least square method was used to determine the approximation plane. The angles between the normal vector for the approximation plane of an articular surface on the medial proximal tibia and each axis of the tibial or world coordinate system were calculated. RESULTS: Morphologically, the inclination of the approximation plane was steeper in osteoarthritic knees than in healthy knees (p < 0.0001). The approximation plane was aligned more parallel to the ground under WB conditions than under NWB conditions in healthy (p < 0.0001) and osteoarthritic knees (p < 0.0001). CONCLUSIONS: The parallel phenomenon in the medial proximal tibia was confirmed for healthy and varus osteoarthritic knees. The medial proximal tibia plays an important role in the parallel phenomenon, assumingly associated with varus alignment and varus thrust. The inclination of the medial proximal tibia may become a new parameter for imaging investigations. LEVEL OF EVIDENCE: III.

DOI： 10.1007/s00167-019-05829-0

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変形性膝関節症初期変化のX線前後画像についての定量的縦断検討

森隆裕, 古賀良生, 望月友晴, 古賀寛, 小林公一, 大森豪, 田邊裕治

臨床バイオメカニクス 41 121 - 126 2020.10

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

変形性膝関節症の初期における下肢アライメントや骨形態変化を明らかにするために、大規模集団検診(松代膝検診)の第5回から8回目(2007年から2016年)においてK-L分類grade 0および1からgrade 2へと移行した142名237膝(男性65名111膝、女性77名126膝、平均年齢71.2±7.4歳)の立位膝前後X線画像を調査した。1)内外側関節裂隙幅比、2)脛骨軸傾斜角度、3)FTA、4)大腿骨と脛骨間の相対的な回旋角度を縦断的に評価した。その結果、内側関節裂隙の狭小、外側の拡大、FTAの増加、脛骨軸傾斜角度の減少はgradeの進行に伴いすべて有意な変化を示し、加えて大腿骨が脛骨に対して外旋する傾向がみられた。また、脛骨軸傾斜がFTAと外側関節裂隙幅比との相関を示し、脛骨の内側傾斜の増大が膝関節の内反変形の初期変化として、大腿-脛骨間のアライメント変化に影響を及ぼし、内反変形の進行の一因となっていることが示唆された。(著者抄録)

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変形性膝関節症初期変化のX線前後画像についての定量的縦断検討

森隆裕, 古賀良生, 望月友晴, 古賀寛, 小林公一, 大森豪, 田邊裕治

臨床バイオメカニクス 41 121 - 126 2020.10

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

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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

Language：English Publishing type：Research paper (scientific journal)

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.

DOI： 10.1007/s00774-019-01079-9

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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

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society for Experimental Mechanics

<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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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

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

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 - 288 2019.10

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 - 125 2019.10

早期変形性膝関節症の立位膝X線画像における大腿骨・脛骨間の相対的回旋変化の縦断的評価

森隆裕, 古賀良生, 大森豪, 望月友晴, 古賀寛, 小林公一, プラムディタ・ジョナス・アディティヤ, 田邊裕治

臨床バイオメカニクス 40 107 - 111 2019.10

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

二次元X線画像から大腿・脛骨間の相対的な回旋を評価するため、変形性膝関節症疫学調査(松代膝検診)の第5回から8回(2007年から2016年)においてK-L分類grade 0からgrade 2へ移行した26名41膝の立位膝X線像を対象とし、大腿骨内側顆長軸の長さ(M)、大腿骨内側顆長軸から膝蓋骨外側縁までの距離(P)、脛骨内側顆間隆起近位端から腓骨頭外側縁までの距離(F)を用いた「大腿骨回旋指標(P/M)」および「脛骨回旋指標(F/M)」を用いて大腿・脛骨間の相対回旋角度を算出した。その結果、grade 0からgrade 2へと進行する過程で、41膝中31膝(76%)が大腿骨に対して脛骨が内旋傾向であった。健常から早期OAへの過程で大腿骨・脛骨間の相対的な回旋変化がOAの進行の要因の一つとして推察され、内反変形との関連の調査が必要である。(著者抄録)

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大腿骨後顆関節形状の検討

穂苅翔, 谷藤理, 望月友晴, 小林公一, 遠藤直人

日本整形外科学会雑誌 93 ( 8 ) S1717 - S1717 2019.9

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

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

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

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

Effect on inclined medial proximal tibial articulation for varus alignment in advanced knee osteoarthritis. Reviewed International journal

Mochizuki T, Koga Y, Tanifuji O, Sato T, Watanabe S, Koga H, Kobayashi K, Omori G, Endo N

Journal of experimental orthopaedics 6 ( 1 ) 14 - 14 2019.3

Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: The inclination of the medial compartment of the proximal tibia (MCT) is assumed to be a critical factor for varus alignment in advanced knee osteoarthritis (OA). This study was aimed at investigating; (1) whether the inclination of MCT is aligned parallel to the ground under weight-bearing (WB) conditions; (2) whether this is associated with the change in alignment and the relative position between the bones; and (3) whether the tibia or femur mainly contributes to the changes. METHODS: We examined 102 knees (84 women, 18 men; mean 75 years). A three-dimensional (3D) assessment system was applied on biplanar whole lower extremity radiographies using 3D-to-2D image registration technique. The evaluation parameters were 1) MCT angle, 2) femorotibial angle (FTA), 3) medial-lateral femoral location to the tibia (M-L femoral location), 4) WB line passing point, and 5) tibial position to WB line (tibial position) and 6) femoral postion to WB line (femoral position). Each parameter was evaluated in non-WB and WB conditions, and the differences (Δ-parameters). RESULTS: MCT angle in the world coordinate system was larger than that in the tibial coordinate system (p < 0.0001). ΔMCT angle was correlated with ΔFTA (p = 0.002) and ΔM-L femoral location (p = 0.004). The tibial position was the more dominant factor for ΔMCT angle (p = 0.001), ΔFTA (p < 0.0001), and ΔWB line passing point (p < 0.0001) . CONCLUSIONS: The inclination in MCT was aligned parallel to the ground under WB conditions (tibial parallel phenomenon). The parallel phenomenon was associated with the change of alignment and the relative position between the bones in the coronal plane. These phenomena were produced mainly by the tibia, not the femur. LEVEL OF EVIDENCE: Level IV.

DOI： 10.1186/s40634-019-0180-x

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進行期変形性膝関節症患者における脛骨近位内側関節面の水平化機序三次元評価による臥位と立位の比較

望月友晴, 谷藤理, 古賀良生, 森隆弘, 小林公一, 古賀寛, 大森豪, 遠藤直人

日本整形外科学会雑誌 93 ( 3 ) S587 - S587 2019.3

健常例における三次元大腿骨皮質骨幅計測と比較検討若年男女vs.高齢男女

染矢圭一郎, 望月友晴, 穂苅翔, 谷藤理, 遠藤直人, 小林公一

日本整形外科学会雑誌 93 ( 3 ) S743 - S743 2019.3

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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Papers - KOBAYASHI Koichi