The posterolateral corner (PLC) of the knee is a complex area of the knee formed by the interaction of multiple structures. Injuries to the PLC often occur in combination with other ligamentous injuries to the knee; most commonly the anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL). Injuries to the posterolateral corner can be debilitating to patients and require prompt recognition and treatment to avoid long term consequences.
Structures found in the posterolateral knee include the tibia, fibula, lateral femur, iliotibial band (ITB), the biceps femoris tendon, the lateral collateral ligament (LCL), the popliteus tendon, the popliteofibular ligament, the lateral gastrocnemius tendon, and the fabellofibular ligament. It has been reported that among these, the 3 most important static stabilizers of the posterolateral knee are the LCL, popliteus tendon, and popliteofibular ligament. Studies have reported that these structures work together to stabilize the knee by restraining varus, external rotation and combined posterior translation with external rotation to it.