Occult fracture of the lesser tuberosity in a 9-year-old female swimmer.

The adolescent avulsion of the lesser tuberosity of the humerus has historically been considered as very rare. The youngest patient reported in the literature is 11 years old. We report a case of a 9-year-old girl who suffered a subscapularis tendon tear with an occult avulsion of the lesser tuberosity. Late repair restored function. Despite that late repair in this present case resulted in excellent outcome, we strongly recommend the additional axillary lateral view of the plain radiographs, as well as proper physical examination to facilitate early diagnosis.