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Fig. 2A —22-year-old male baseball player with medial elbow pain 2.5 months after ulnar collateral ligament reconstruction (patient 1 in Table 1). Stress radiographs without (A) and with (B) 15 kPa of force depict avulsion fracture of medial epicondyle (arrow, A). Medial instability is shown by marked widening of medial joint space (double arrow, B) with valgus stress. Stress view also shows additional displacement of medial epicondyle fragment (curved arrow, B).