超音波を用いた肩関節外転 • 外旋時の棘上筋 • 棘下筋断面増加率の検討

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The purpose of this study was to examine the contraction of supra- and infraspinatus muscles during abduction or external rotation of the glenohumeral joint by ultrasonography. 136 baseball-pitchers in high schools belonging to the Gunma Prefectural High School Baseball Federation were examined. Of the 136pitchers, the subjects were 76 pitchers in whom no abnormal change of the rotator cuff was detected by ultrasonography. The subjects were all males, with a mean age of 16.6 (15-17) years. The contraction of supra- and infraspinatus muscle during abduction in the scapular plane and external rotation in neutral position of the glenohumeral joint were evaluated. When we evaluate the infraspinatus muscles, the transverse fibers parallel to the scapular spine (ISPT) and muscular fibers parallel to the lateral border of the scapula (ISPO) were examined. Abduction: There were no significant differences in the contraction of supra- and infraspinatus muscles between the pitching and non-pitching sides. External rotation: There were also no significant differences in the contraction of both muscles between the pitching and non-pitching sides. In the contraction of infraspinatus muscles during abduction, the ISPT decreased in both shoulders, while the ISPO increased. There was a significant difference between the ISPT and ISPO during abduction. We examined the contraction of supra- and infraspinatus muscles during abduction or external rotation of the shoulder joint by ultrasonography. There were no significant differences in the contraction of supra- and infraspinatus muscles between the pitching and non-pitching sides. In the contraction of infraspinatus muscles during abduction, the ISPT decreased in both shoulders, while the ISPO increased.
日本肩関節学会の論文

超音波を用いた肩関節外転 • 外旋時の棘上筋 • 棘下筋断面増加率の検討

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