The posteromedial corner is the region towards the back of the knee on the inner side.
The semimembranosus expansion (SME) is the expansion of the semimembranosus tendon, and inserts the femur, tibia and the medial meniscus. Other structures of the posteromedial corner include the posterior oblique ligament, the medial collateral ligament and the tendon of the medial head of the gastrocnemius muscle.
The neglected corner
Much recent attention has been paid by radiologists and surgeons to the posterolateral corner, but the posteromedial corner is often neglected.
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FORUM DISCUSSIONS
Any footballers torn their ACL AND MCL?
CLINICAL PUBLICATIONS
Reefing of the Posteromedial Capsule in Anteromedial Rotatory Instability. Offerhaus C, Balke M, Arner JW, Musahl V and Höher J. Arthrosc Tech. 2018 May; 7(5): e547–e551.