Ruputur of Long Head of Biceps Tendon in Young Adult by Throwing

Ruputur of long head of biceps tendon was known to occur rarely in a young adult. We report one case of the injury in a young soft-ball pitcher. Our case was a 21 years old male. He was a pitcher of a soft-ball team and he began Windmill throw from 13 years old without proper direction. At the acceleration phase of the normal pitching form, long head of biceps tendon is not extensed hard and not pressed hard to bicipital groove. The pitcher that was not directed proper from, the tendon was extensed and pressed hard to bicipital groove. So the tendon in a young adult becomes weak and ruputures with slight force. We thought that orthopedists should understand characters of each sport.