Overuse upper extremity injuries in the skeletally immature patient: beyond Little League shoulder and elbow.

Overuse injuries of the shoulder and elbow are common in the skeletally immature throwing athlete. This review goes beyond describing the classic imaging findings of Little League shoulder and elbow and probes deeper into new insights suggesting a unifying etiology of metaphyseal or metaphyseal equivalent injury as the cause of many of the bony lesions described. Injury patterns change depending on the athlete's skeletal maturation, and the spectrum of abnormalities is reviewed.