Posterior oblique ligament

The posterior oblique ligament is a part of the posteromedial corner of the knee. It originates from the adductor tubercle and the posterior aspect of the medial femoral condyle, and inserts onto the posterior tibia just below the joint line, posterior to the deep medial collateral ligament. Functionally, it is a key stabilizer against internal rotation of the tibia, especially in early knee flexion (0°–30°), and provides important restraint to posterior tibial translation in the setting of posterior cruciate ligament deficiency. The posterior oblique ligament is frequently injured in complex knee trauma and is often associated with injuries to the medial collateral ligament, semimembranosus tendon, and oblique popliteal ligament.