Panner disease is an osteochondrosis of the capitellum of the elbow.[1] Panner disease is primarily seen in boys between the ages of five and ten years old.[2] Panner disease is often caused by excessive throwing due to valgus stress. The disease causes pain and stiffness in the affected elbow and may limit extension; the affected elbow is usually on the dominant arm the child uses.[3] The disease may be associated with pitching and athletic activity. On radiographs, the capitellum may appear irregular with areas of radiolucency.