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19 year old football player presents with knee pain after being tackled. Physical exam findings were positive for swelling and a positive anterior drawer test (anterior translation of the tibia with respect to the femur). Sagittal T2 MRI demonstrates extensive edema and a mid-substance ACL tear (arrow). Associated findings not shown include a classic pattern of bone bruising involving the lateral femoral condyle and the posterolateral tibial plateau. Key point: the ACL is the most commonly injured ligament of the knee, especially in athletes.

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