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A 14-year-old man presented to our emergency department with 3 days of progressively worsening right knee pain that was exacerbated by movement. The patient played basketball and had a history of asthma, but he denied any recent trauma or prior knee pain. Systemic symptoms, including fever, weight changes and fatigue, were absent. On examination, he had tenderness at the tibial tuberosity and a small effusion, but no overlying erythema or …
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