Throwing arm injuries are common and often related to shoulder rotational laxity. Both shoulder external and internal rotational laxity are often checked in a physical assessment. The shoulder external rotation of the throwing arm during physical assessment is reported to be about 10 degree greater than the non-throwing arm [1]. Throwing arm injuries often occur during throwing activities. High forces and torques were generated during throwing activity. Extremely high shoulder external rotation (about 180°) and high internal rotation velocity (over 7000°/s) during baseball pitching are reported [2].

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