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Problems in Defining the Angle of Shoulder Axial Rotation Tetsuya Jinno 1 , Sadao Morita 2 , Junya Aizawa 3 , Tadashi Masuda 4 1Department of Joint Surgery and Sports Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University 2Department of Rehabilitation Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University 3Sports Medicine Clinical Center of Medical Hospital, Tokyo Medical and Dental University 4Department of Symbiotic Systems Science, Fukushima University Keyword: 肩関節(shoulder joint) , 関節角度定義(definitions of joint angle) , バイオメカニクス(biomechanics) , 動作解析(motion analysis) pp.574-581
Published Date 2014/8/18
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Abstract : Angles of the shoulder joint are usually defined in each of the sagittal, coronal, and horizontal planes passing through the center of the shoulder joint. One of the problems with this method is the difficulty of describing some positions of the shoulder joint such as the anterolaterally elevated position. In 2005, the International Society of Biomechanics proposed a recommendation on definitions of joint coordinate systems including the shoulder based on Euler/Cardan angles, which have often been used for the purpose of research on shoulder joint movement in daily activities. With this definition, however, it still remains impossible to define the angle of axial rotation in the hanging down position. Also, Codman's paradox, the phenomenon where the rotation angle of the shoulder changes after motions without axial rotation of the arm, remains unsolved. To solve these problems, a new method to define the angle of shoulder axial rotation, the non-singular method, has been proposed. This review describes the history and the problems of the methods used to define shoulder angles, and presents this new method of definition.


Copyright © 2014, The Japanese Association of Rehabilitation Medicine. All rights reserved.

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電子版ISSN 印刷版ISSN 1881-3526 日本リハビリテーション医学会

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