Sarah presents with left lateral knee pain and has some locking in full extension. There is tenderness over the medial joint line. When the knee is extended with the foot externally rotated and some valgus stress is applied, a click is noted. What is the most likely diagnosis?

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This maneuver is called the McMurray test. Along with the medial joint line tenderness, you should suspect a medial meniscus injury. Cruciate ligament tears should cause an anterior or posterior "drawer sign." Although we can't rule out a lateral meniscus tear, the tenderness along the medial joint line makes this the more likely site of injury.

Sarah Presents with Left Lateral Knee Pain and Has Some