Faculty Profiles - KOBAYASHI Koichi

Papers - KOBAYASHI Koichi

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Determination of Joint Contact Area Using MRI

YOSHIDA Hidenori, KOBAYASHI Koichi, SAKAMOTO Makoto, TANABE Yuji

Japanese Journal of Radiological Technology 65 ( 10 ) 1407 - 1414 2009.10

Language：Japanese Publisher：Japanese Society of Radiological Technology

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 in vivo 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 in vivo 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 in vivo.

DOI： 10.6009/jjrt.65.1407

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Three-Dimensional Trabecular Bone Structure Analysis Using Magnetic Resonance Imaging

SAKAMOTO Makoto, HIGO Yusuke, SASAGAWA Keisuke, KOBAYASHI Koichi, YOSHIDA Hidenori, MIYAO Masunao

Japanese journal of clinical biomechanics 30 27 - 34 2009.9

Accuracy of 2D-3D image registration of bone using single-plane fluoroscopic images

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

Japanese journal of clinical biomechanics 30 457 - 462 2009.9

Development of a setting method for the stem during total hip arthroplasty using a three-dimensional leg alignment assessment system

KUBOTA Yosuke, SAKAMOTO Makoto, KOBAYASHA Koichi, KOGA Yoshio, SATO Takashi, TANABE Yuji, KAI Shin, SEITOKU Norio

Japanese journal of clinical biomechanics 30 301 - 306 2009.9

Development of a three-dimensional motion analysis technique of femorotibial joint by means of motion capture system : Application of a three-dimensional leg alignment assessment system to three-dimensional joint motion analysis

KIMURA Taro, NISHINO Katsutoshi, KAI Shin, OMORI Go, TANABE Yuji, SAKAMOTO Makoto, KOBAYASHI Koichi, SEITOKU Norio, KOGA Yoshio

Japanese journal of clinical biomechanics 30 487 - 492 2009.9

Application of MRI Model for Three-Dimensional Lower Extremity Alignment Assessment System

SASAGAWA Keisuke, ISHIYA Shuichi, SAKAMOTO Makoto, KOBAYASHI Koichi, HAYASHI Toyohiko, TANABE Yuji, SATO Takashi, OMORI Go, KOGA Yoshio

Japanese journal of clinical biomechanics 30 479 - 486 2009.9

Analysis of Three-Dimensional Contact Area of Radiocarpal Joint Using Magnetic Resonance Imaging

SASAGAWA Keisuke, SAKAMOTO Makoto, KOBAYASHI Koichi, YOSHIDA Hidenori, TANABE Yuji

Japanese journal of clinical biomechanics 30 89 - 96 2009.9

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

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

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

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

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.

DOI： 10.11395/jjsem.9.s151

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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

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

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

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.

DOI： 10.1299/jbse.4.192

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

SASAGAWA Keisuke, WATANABE Satoshi, KOBAYASHI Koichi, SAKAMOTO Makoto, TANABE Yuji, SATO Takashi, 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 29 397 - 402 2008.11

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

KOBAYASHI Koichi, TANAKA Nobuaki, ODAGAWA Ken-ichi, SATO Takashi, SAKAMOTO Makoto, TANABE Yuji, OMORI Go, 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 29 421 - 426 2008.11

Estimation of Mineral Density and Viscoelastic Properties of Human Dentin

SAKAMOTO Makoto, KITAMURA Takuya, SASAGAWA Keisuke, KOBAYASHI Koichi, ENDO Hideaki, ITOH Hidemi

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 29 153 - 160 2008.11

Measurement of water content in articular cartilage using near infrared spectroscopic meter : Attenuation characteristics of near infrared ray

SATO Shinya, HAMADA Kazunari, TANABE Yuji, SAKAMOTO Makoto, KOBAYASHI Koichi, KIKUCHI Tatsuya, 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 29 81 - 86 2008.11

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

TANAKA Nobuaki, KOBAYASHI Koichi, TANABE Yuji, SATO Takashi, KOGA Yoshio, OMORI Go, 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 29 403 - 408 2008.11

Dynamic Viscoelastic Properties of Human Dentin

SAKAMOTO Makoto, SASAGAWA Keisuke, KOBAYASHI Koichi, ENDO Hideaki, ITOH Hidemi

Journal of JSEM 8 ( 2 ) 121 - 126 2008.6

Basic Research for Quantitative Measurement of Water Content in Articular Cartilage Using Near Infrared Spectroscopic Meter

HAMADA Kazunari, SATO Shinya, KIKUCHI Tatsuya, TANABE Yuji, SAKAMOTO Makoto, KOBAYASHI Koichi, KOGA Yoshio

非破壊検査 = JOURNAL OF THE JAPANESE SOCIETY FOR NON-DESTRUCTIVE INSPECTION 57 ( 2 ) 89 - 95 2008.2

Effect of Low-Gamma Irradiation on the Impact Compressive Properties of Ultra High Molecular Weight Polyethylene and Its Constitutive Model Reviewed

小林公一, 坂本信, 田邊裕治

材料 57 ( 9 ) 882-886 (J-STAGE) - 886 2008

Language：Japanese Publisher：日本材料学会

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&ndash;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 Bergstr&ouml;m [Biomaterials Vol.23 p.2329 (2002)]. We found that the elasto-viscoplastic model had a potential to predict the observed impact stress-strain responses.

DOI： 10.2472/jsms.57.882

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