Which structures compose the posterolateral corner of the knee?

The posterolateral corner (PLC) of the knee is a complex anatomical region important for the stability of the knee joint, particularly in maintaining varus stability and resisting posterior translation of the tibia. The key structures that make up the posterolateral corner include the lateral collateral ligament (LCL), the popliteus tendon, and the arcuate ligament complex.

The LCL, which runs from the lateral femoral epicondyle to the head of the fibula, provides lateral stability to the knee. The popliteus tendon helps in the dynamic stabilization of the knee, especially during the unlocking mechanism of the knee when moving from a locked extended position to flexion. The arcuate ligament complex consists of the arcuate ligament and the fabellofibular ligament, contributing further to the stabilization of the posterolateral corner.

Together, these structures work synergistically to prevent excessive varus and external rotation during activity, protecting the knee from potential injuries. The interaction between these components is vital for maintaining not only stability but also functional mobility during high-demand athletic activities.

The other options do not accurately reflect the composition of the posterolateral corner of the knee, as they refer to structures either primarily associated with the anteromedial or central aspects