A rare injury of traumatic separation of the epiphysis of the coracoid process associated with Grade I acromioclavicular sprain occurred in a nine-year-old girl. The accident occurred when she was asleep. The mechanism of injury was unknown. Tenderness and mild swelling around the coracoid process were seen. The anteroposterior radiograph of the shoulder with the arm abducted 150 degrees (abduction view) clearly demonstrated the epiphyseal separation with subtle displacement at the base of the coracoid process. She was treated by simple immobilization and recovered fully with normal shoulder arm function.
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Taga et al. (1986) studied this question.