The posterior lateral corner (PLC) of the knee is an important anatomical structure that is located on the lateral (outside) aspect of the knee joint, towards the back. This area is important for stability and proper functioning of the knee. It is composed of several structures, including:

The lateral collateral ligament (LCL) is one of the main structures that attaches at the PLC. It runs from the lateral epicondyle of the femur (thigh bone) to the head of the fibula (smaller bone in the lower leg) and helps to provide stability to the knee joint. It prevents excessive varus (inward) movement of the knee and is commonly injured in contact sports or accidents.

The popliteus muscle also attaches at the PLC. It is a small muscle located behind the knee that helps to rotate the knee and unlock it when it is bent. The popliteus muscle is also important in stabilizing the knee when walking and running.

Another structure that attaches to the PLC is the arcuate ligament complex. This ligament complex is made up of several smaller ligaments that run from the lateral femoral condyle to the fibula and helps to provide stability to the knee joint as well. It is also responsible for preventing excessive external rotation of the knee.

The importance of the PLC is vital in proper knee function and stability, It is particularly important for athletes, who rely on the knee for a…