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Ulnar Diaphyseal Stress Fracture in a Bowler

A 16-year-old right-handed male bowler reported a history of 3 weeks of increasing pain in the proximal right ulna. He noted this pain while bowling. He bowled 3 to 8 games per day using a 16-pound, fingertip ball. Significant physical findings included relative hypertrophy of the right upper extremity and tenderness to palpation along the ulna at the junction of the proximal and middle third of the ulna. The pain was reproduced with resisted flexion and extension of the elbow as well as