Lateral collateral ligament rupture
Sports injury. Lateral knee pain.
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Full-thickness rupture (grade III) of the distal lateral collateral ligament. The biceps femoris tendon appears attenuated and hyperintense some fibers are in intact (grade II). Hyperintensity of the popliteofibular and lateral meniscocapsular fibers - the remainder of the posterolateral corner structures appear uninjured.
No meniscal tear. Medial collateral and cruciate ligaments are intact.
The lateral collateral ligament is one of the main stabilizers of the posterolateral corner of the knee. The posterolateral corner is uncommonly injured in isolation (as in this case) and associated meniscal and anterior cruciate ligament injuries are common.