The Posterior cruciate ligament is an intrarticular ligament in the knee which originates on the anterolateral border of the medial femoral condyle, at the point where the roof and intercondylar notch meet. It inserts 1-1.5cm inferior to the posterior rim of the tibia, in the PCL fovea. This insertion is extraartiular. The blood supply to the PCL is the middle genicular artery and it is innervated by the tibial nerve. The PCL's average length is 38mm and average width is 18mm. It is made up of a anterolateral and posteromedial bundle, which are tight in flexion and extension, respectively. The tension in each bundle develops in a reciprocal fashion.

The PCL acts as the primary restraint to posterior translation of the tibia and as the secondary restraint to external rotation. It has been found to resist 90% of the posterior force at 30 and 90 degrees of flexion. Other secondary restraints of the knee are the LCL, MCL and Posterolateral corner, all of which play a vital role in the PCL deficient knee. The posterolateral corner, PLC, is made up of the iliotibial band, LCL, biceps tendon, popliteus tendon and the popliteofibular ligament.

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