Chronic repetitive stress of the elbowis a common problem in youngathletes. In fact, up to 58% of adolescentpitchers report elbow pain.
Medial epicondylitis or medial epicondylarapophysitis is one of thebetter known repetitive stress injuriesand is frequently referred to as “Little Leaguer’s elbow.”
In this type of injury, valgus stressfrom the overhead throwing motion istransmitted from the muscles that inserton the medial epicondyle to thephysis.
These stresses result in repetitivemicrotrauma, eventually manifestedby physeal widening, essentiallya Salter-Harris type I stress fracture.