The semimembranosus has five insertional expansions at the posteromedial knee, making it the most important dynamic posteromedial stabiliser. Its direct arm reinforces the posteromedial tibia, the oblique popliteal ligament reinforces the posterior capsule, and the capsular arm tethers the medial meniscus. In posteromedial corner injuries, the semimembranosus expansions must be repaired or advanced alongside the POL.
Posteromedial dynamic knee stabilisation through its five-armed insertion complex; posterior capsule reinforcement; the primary dynamic posteromedial stabiliser
Posteromedial corner reconstruction uses semimembranosus advancement — the direct arm and oblique popliteal ligament expansions are advanced to the femoral attachment of the superficial MCL to restore posteromedial tension. This technique is more anatomically sound than simple MCL-POL suturing.
Semimembranosus expansion disruption contributing to valgus instability managed with direct repair or semimembranosus advancement reconstruction.
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