A three-dimensional analysis of clavicular movement using Open-MR

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  • YONEYA Naoki
    Graduate School of Science and Technology, Niigata University
  • TANAKA Hiroshi
    Nobuhara Hospital Institute of Biomechanics
  • HAYASHI Toyohiko
    Graduate School of Science and Technology, Niigata University Department of Biocybernetics, Faculty of Engineering, Niigata University
  • MAEDA Yoshinobu
    Graduate School of Science and Technology, Niigata University Department of Biocybernetics, Faculty of Engineering, Niigata University
  • WATANABE Tetsuya
    Graduate School of Science and Technology, Niigata University Department of Biocybernetics, Faculty of Engineering, Niigata University
  • NAKAMURA Yasuo
    Faculty of Health and Sports Science, Doshisha University
  • NINOMIYA Hiroki
    Nobuhara Hospital Institute of Biomechanics
  • KOMAI Masahiko
  • NOBUHARA Katsuya
    Nobuhara Hospital Institute of Biomechanics

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Other Title
  • Open-MR 装置と3D/3D-registration を用いた鎖骨運動の3 次元解析
  • Open MR ソウチ ト 3D 3D registration オ モチイタ サコツ ウンドウ ノ 3ジゲン カイセキ

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Abstract

In order to figure out motion mechanism of human shoulder joint, we have been analyzing in-vivo shoulder movements, particularly humeral elevation within the scapular plane, using open-MR imaging and 3D/3D-registration technique. In this paper, we applied this method to analyze the clavicle motion relative to the chest. To do so, we have to establish the cheat coordinate system having high reproducibility using 3D MR imagines of the chest. Then we manually extracted the apexes of six ribs connected to the sternum and set the sternum coordinate system denoted as ΣST using these apex points. We evaluated reproducibility of ΣST in the following two respects: 1) the variation of six apex points extracted by five different testers from the same MR images; 2) the variation of the extracted apex points as well as ΣST in different humeral elevation angles. Consequently, the apex points as well as ΣST had a high reproducibility in a level of the slice interval of MR imaging in both the same images and the different images, demonstrating the applicability of ΣST to the clavicle motion analysis. Using this coordinate system, we tried to analyze the clavicle motion of four different subjects. The results agreed well with its previous reports in both respects of the direction and range of the clavicle motion.

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