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Anterior cruciate ligament rupture and posteromedial corner injury

Case contributed by Henry Knipe
Diagnosis certain

Presentation

Acute knee injury.

Patient Data

Age: 20 years
Gender: Female

Full thickness rupture of the anterior cruciate ligament with anterior tibial translation and osteochondral impaction injuries to the lateral sulcus terminalis and to a lesser extent the posterolateral tibial plateau. 

Grade 2 injury to distal semimembranous tendon with intra- and peri-tendinous high signal and myofascial fluid medially. Mild hyperintensity adjacent to the posterior oblique ligament and oblique popliteal ligament. No meniscal tear. 

Case Discussion

Typical appearances of a full thickness ACL tear with a pivot-shift pattern of bone contusions. Low-grade posteromedial corner injury, mainly of the semimembranosus tendon - these have a high association with ACL injuries. 

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