Little Leaguer’s Shoulder
Little leaguer’s shoulder, also known as proximal humeral epiphysitis, is an injury to the humerus (arm bone) at the shoulder. It occurs in growing athletes, typically aged 10-15, who perform frequent repetitive overarm throwing motions, such as baseball pitchers. As the adolescent is still growing, the growth plates have not fused.
The repetitive rotational stress placed on the shoulder causes a Salter-Harris Type 1 injury, which is a fracture and slippage of the growth plate of the humerus at the shoulder. Little leaguer’s shoulder typically presents as a gradual onset of shoulder and upper arm pain and tenderness, made worse by overarm throwing.