A 29-year-old recreational soccer player presents with acute…
A 29-year-old recreational soccer player presents with acute right knee pain after an opponent struck the outside of his knee during a tackle. He reports immediate medial knee pain and swelling, with difficulty bearing weight. On exam, there is localized tenderness along the medial joint line and laxity with valgus stress testing at 30° flexion. Lachman and anterior drawer tests are negative. What is the most likely diagnosis?