CT を用いた肩関節前方挙上時の肩関節の 3 次元動態解析

概要

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There was no accurate report on 3D kinematics of the shoulder which includes the sternoclavicular joint. The purpose of this study was to analyze the 3D kinematics of SC, AC and GH joint during arm elevation using CT. We examined 6 shoulders of 3 healthy volunteers (all men; mean age 28.7 years old). Computer tomographies of the shoulder (including sternum, clavicle, scapula and humeral) were obtained in the neutral position and head touch position. 3D model of each bone were created from CTs and the movement of each bone was calculated by volume merge, and custom computer program. The movements of the bone were seen by the Euler angle, which used 3 rotational parameters and 3 quantities of movement. We measured the rotation and quantity of movement of each bone from the neutral to head touching positions. We calculated the SC joint movement as the diference of movement of the clavicle from the sternum, AC joint movement as the diference of the scapula from the clavicle and GH joint movement as the difference of the humeral from the scapula. Our measurement method was different from the past method. However, our results were similar to the past methods. This method is correct and can measure a wide area in one step. Clinical application will be possible in future.