An 11-year-old patient complains of pain after pitching during a baseball game. On examination, the NP notes increased pain in the right elbow with wrist flexion against resistance. This finding is most consistent with:

Rationale: A. Lateral epicondylitis, or “tennis elbow,” causes pain on the lateral (outside) aspect of the elbow, typically worsened with wrist extension against resistance. B. Medial epicondylitis, or “little league elbow,” causes pain on the medial (inside) aspect of the elbow, which is aggravated by wrist flexion against resistance. This is common in young athletes who perform repetitive throwing motions, such as baseball pitchers. C. Ulnar collateral ligament injury involves instability of the elbow and pain with valgus stress, rather than isolated pain with wrist flexion. D. Arthritis in the elbow is uncommon in an 11-year-old and typically presents with chronic pain, swelling, and decreased range of motion, not acute pain following pitching.