Faculty Profiles - KOBAYASHI Koichi

MISC - KOBAYASHI Koichi

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関節のバイオメカニクス荷重下における関節の三次元アライメント評価

小林公一

非破壊検査 67 ( 4 ) 151‐156 2018.4

荷重下における関節の三次元アライメント評価—Three-Dimensional Assessment of Joint Alignment during Weight-Bearing—関節のバイオメカニクス

小林公一

非破壊検査 : journal of the Japanese Society for Non-destructive Inspection / 日本非破壊検査協会編 67 ( 4 ) 151 - 156 2018.4

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 2018.3

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

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

Language：Japanese Publisher：Japanese Society for Medical and Biological Engineering

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.

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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

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

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

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

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

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

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

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&M材料力学カンファレンス(CD-ROM) 2017 ( 0 ) ROMBUNNO.OS1102 2017.10

Language：Japanese Publisher：一般社団法人日本機械学会

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.

DOI： 10.1299/jsmemm.2017.OS1102

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

Language：Japanese Publisher：一般社団法人日本機械学会

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.

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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

Language：Japanese Publisher：一般社団法人日本機械学会

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.

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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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