高校野球選手の肩外旋可動域は肩内旋筋力と負に相関する

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Increased shoulder external rotation is one of the causes of shoulder injury in throwing athletes. Shoulder external rotation angle is affected by humeral retroversion and anterior capsular laxity, and it may depend on shoulder muscle strength. We investigated the relationship between shoulder external rotation angle and shoulder muscle strength. 32 high-school baseball players without any general joint laxity or previous upper extremity operation were examined bilaterally. The shoulder external rotation (ER) angle was measured at 90° shoulder abduction in the supine position. Muscle strength of shoulder internal rotation (IR strength), external rotation (ER strength), and abduction (AB strength) was measured using a hand-held dynamometer. The correlation between the ER angle and muscle strength was evaluated using Pearsons correlation coefficient. The ER angle of the throwing shoulder was 113.2° ± 7.9° (mean ± SD), while the IR strength, ER strength, and AB strength were 217.1 ± 37.5 N, 125.3 ± 15.3 N, and 137.3 ± 32.3 N, respectively. The ER angle negatively correlated with the IR strength and AB strength for the throwing shoulder (p = 0.017, r =-0.42 and p = 0.033, r = -0.38, respectively). The contralateral shoulder showed no such correlation between the ER angle and muscle strength; however, there was a tendency for negative correlation between the ER angle and IR strength (p = 0.05, r = -0.35). Therefore, the IR strength is believed to mostly affect the ER angle. Thus, strengthening of the shoulder internal rotator muscles may prevent excessive shoulder external rotation during the throwing motion, which is a cause of shoulder injury.
2009-07-27

高校野球選手の肩外旋可動域は肩内旋筋力と負に相関する

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