The posteromedial corner of the knee includes the superficial MCL, posterior oblique ligament, and semimembranosus expansions. PMC injury occurs in combined valgus and rotation mechanisms. The posterior oblique ligament from the medial femoral epicondyle reinforces the posteromedial capsule and is a secondary restraint to ACL function. PMC tears with PCL injuries produce severe combined instability.
| Origin | Medial femoral condyle and posteromedial tibia |
|---|---|
| Insertion | Medial tibial plateau, posteromedial capsule, and semimembranosus expansion |
| Actions | Resists valgus stress, internal tibial rotation, and posteromedial translation |
|---|
Isolated PMC injuries may be managed conservatively if the knee is stable in extension, but combined PMC-ACL or PMC-PCL injuries require surgical reconstruction. MRI assesses the posterior oblique ligament and semimembranosus expansion as the primary PMC structures.
Posteromedial corner and PCL disruption producing severe rotatory and posterior instability requiring combined staged reconstruction.
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