Non-Medial Ulnar Collateral Ligament Elbow Pathology in the Thrower: Valgus Extension Overload, Osteochondritis Dissecans, Olecranon Stress Fracture, and Ulnar Nerve.

Injury rates in baseball players reach as high as 5.8 per 1000 at the professional level. Recent data have singled out the elbow as the leading cause of injured list necessitating injuries and the costliest injury location in professional baseball. While the medial ulnar collateral ligament (MUCL) has gained the largest notoriety in this population, elbow injury in the thrower occurs as a spectrum of pathologies. These pathologies may encompass other injuries often resulting from or occurring in conjunction with MUCL insufficiency. These conditions include valgus extension overload syndrome, osteochondritis dissecans, olecranon stress fractures, and ulnar nerve pathology.