Ruptured anterior cruciate and medial collateral ligaments
Injury at sports training.
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Large joint effusion. Moderate sized Baker’s cyst, partially ruptured superiorly.
Menisci are intact. Full-thickness tear of the medial collateral ligament. Lateral collateral ligament is intact. Full-thickness tear of the anterior cruciate ligament within the proximal to mid fibers. Posterior cruciate ligament is intact. Minor hyperintensity around the arcuate ligament. Popliteus tendon is intact.
Osteochondral impaction fractures of the lateral terminalis sulcus and posterolateral tibial plateau. Articular cartilage within all three compartments is otherwise preserved.
Pivot-shift mechanism of injury results in complete rupture of the anterior cruciate ligament and complete rupture of the medial collateral ligament and low-grade posterolateral corner injury.