CT 画像を用いたゼロポジション肢位における肩関節の可動域評価

概要

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Background: It is well known that the changes of rotation angles are decreasing of internal rotation angle (IRA) and increasing of external rotation angle (ERA) in the dominant shoulder of overhead athletes. However, it has not been studied how much the glenohumeral joint (GHJ) and scapulothoracic joint (STJ) affect them. The purpose of this study was to evaluate GHJ with CT images obtained at Zero position. Methods: 20 shoulders of 10 healthy volunteers (5 overhead athletes (the O group) and 5 non-overhead athletes (the N group), all men) were evaluated. CT images were taken with the arm in the maximum internal and external rotation at the Zero position in supine position. The range of motion (ROM) of GHJ and STJ joint were measured using 3D kinematic analysis. Results: The average IRA, ERA and ROM (dominant/non-dominant) of GHJ were 51.6 /64.6, 21.6/28.8 and 73.2/93.4 degrees respectively in O group. The average IRA, ERA and ROM of GHJ were 68/61.4, 26.4/40.6 and 94.4/102 degrees respectively in N group. Conclusion: IRA and ROM of the dominant GHJ in O group could be less than that in the N group.
日本肩関節学会の論文