Postero-lateral corner reconstruction:

Posterior Cruciate Ligament (PCL):
The PCL is one of four main ligaments which hold the femur and tibia together. The PCL’s main job is to keep the tibia from falling too far back (posteriorly) from the femur.

Injuries to the posterior cruciate ligament (PCL) are rare, accounting for only about 5% of all knee ligament injuries. There is disagreement among physicians over which patients with isolated PCL ruptures (that do not have any other ligament damage) should have surgery and which patients should not have surgery – and for those who need surgery, just how to perform it to achieve the best results. The problem is that these injuries can either not cause many problems, or they can be disabling and cause considerable problems with sports and, in some cases, regular activities of daily living.

Medial patello femoral ligament reconstruction [MPFL]: