Presentation
Knee pain post sports injury.
Patient Data
No knee joint effusion. No meniscal tear. ACL and PCL are intact.
Near or full-thickness proximal medial collateral ligament tear. Proximal posterior oblique ligament high signal in keeping with a partial tear; remaining posteromedial corner structures are uninjured.
Lateral collateral ligament complex is intact. Popliteus tendon insertion high signal without tendon redundancy, adjacent lateral femoral condyle bone marrow edema and popliteus tendon sheath effusion. Remaining posterolateral corner structures are intact.
Quadriceps and patellar tendons are intact. Multifocal patellar full and partial thickness chondral fissures. Superolateral Hoffa's fat pad high signal compatible with chronic patellar maltracking.
Case Discussion
The combination of medial/posteromedial corner injury with an isolated popliteus tendon partial tear is an uncommon combination, probably a valgus/external rotation mechanism in an extended knee.
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