Faculty Profiles - KOBAYASHI Koichi

Papers - KOBAYASHI Koichi

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UKA 人工膝単顆置換術における下肢アライメント変化と置換側コンパートメントJoint line変化との関係

望月友晴, 佐藤卓, 山際浩史, 小林公一, 有海明央, 渡辺聡, 谷藤理, 大森豪, 古賀良生, 遠藤直人

日本人工関節学会誌 41 446 - 447 2011.12

Three-dimensional in vivo motion analysis of normal knees using single-plane fluoroscopy Reviewed

Osamu Tanifuji, Takashi Sato, Koichi Kobayashi, Tomoharu Mochizuki, Yoshio Koga, Hiroshi Yamagiwa, Go Omori, Naoto Endo

JOURNAL OF ORTHOPAEDIC SCIENCE 16 ( 6 ) 710 - 718 2011.11

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

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

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

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

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

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.

DOI： 10.11395/jjsem.11.s239

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Other Link： http://hdl.handle.net/10191/26369

透視X線画像を用いた人工膝関節単顆置換術前後のTEAからみた三次元運動解析

望月友晴, 佐藤卓, 山際浩史, 渡辺聡, 谷藤理, 小林公一, 大森豪, 古賀良生, 遠藤直人

JOSKAS 36 ( 4 ) 332 - 332 2011.6

透視X線画像を用いた人工膝関節単顆置換術前後の三次元運動解析

望月友晴, 佐藤卓, 山際浩史, 谷藤理, 小林公一, 古賀良生, 大森豪, 松枝宗則, 遠藤直人

日本整形外科学会雑誌 85 ( 3 ) S352 - S352 2011.3

Experimental validation of femorotibial contact behavior assessed by the image matching method

豊田貴嗣, 小林公一, 坂本信

Japanese journal of clinical biomechanics 32 483 - 487 2011

Estimation of in-vivo quadriceps forces of the KNEE - A combined in-vivo patellofemoral joint kinematics measurement and finite element prediction Reviewed

Koichi Kobayashi, Guoan Li

ASME 2011 Summer Bioengineering Conference, SBC 2011 851 - 852 2011

TKAにおけるTransepicondylar Axisからみた大腿骨顆部形状変化

望月友晴, 佐藤卓, 山際浩史, 小林公一, 渡辺聡, 谷藤理, 大森豪, 古賀良生, 遠藤直人

日本人工関節学会誌 40 592 - 593 2010.12

Accuracy of image-matching in a setting method for the stem during total hip arthroplasty using a three-dimension leg alignment assessment systems

KUBOTA Yosuke, SAKAMOTO Makoto, KOBAYASHI Koichi, KOGA Yoshio, MINATO Izumi, ITO Tomoyuki, SEITOKU Norio

Japanese journal of clinical biomechanics 31 313 - 319 2010.9

Development of Automatic Method for Construction of Joint Coordinate System on Tibial 3D Bone Model

KAI Shin, SASAGAWA Keisuke, KOGA Yoshio, SATO Takashi, TANIFUJI Osamu, SAKAMOTO Shin, KOBAYASHI Koichi, TANABE Yuji

Japanese journal of clinical biomechanics 31 333 - 340 2010.9

Transmission characteristics of near-infrared light in articular cartilage

MATSUMOTO Go, ODASHIMA Koki, KIKUCHI Tatsuya, KOBAYASHI Koichi, SAKAMOTO Makoto, TANABE Yuji, KOGA Yoshio

Japanese journal of clinical biomechanics 31 73 - 77 2010.9

In Vivo Structural Analysis of Trabecular Bone of Talus and Calcaneus Using Magnetic Resonance Imaging

SAKAMOTO Makoto, SASAGAWA Keisuke, KUBOTA Yosuke, KOBAYASHI Koichi, YOSHIDA Hidenori

Japanese journal of clinical biomechanics 31 13 - 20 2010.9

Analysis of contact behavior of knee joint using image registration method

ODAGAWA Kenichi, TOYODA Takatsugu, KOBAYASI Koichi, TANIFUJI Osamu, SASAGAWA Keisuke, SATO Takashi, SAKAMOTO Makoto, KOGA Yoshio, TANABE Yuji, OMORI Go

Japanese journal of clinical biomechanics 31 349 - 355 2010.9

Accuracy Estimation of Three-Dimensional Lower Extremity Alignment Assessment System Using MRI Models for Bone and Cartilage

SASAGAWA Keisuke, SAKAMOTO Makoto, KOBAYASHI Koichi, KOGA Yoshio, TANABE Yuji, OMORI Go, SATO Takashi

Japanese journal of clinical biomechanics 31 341 - 348 2010.9

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

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

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.

DOI： 10.11395/jjsem.10.s251

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Other Link： http://hdl.handle.net/10191/26374

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

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

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

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.

DOI： 10.11395/jjsem.10.s247

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Other Link： http://hdl.handle.net/10191/26371

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