PCL INJURY ⠀ Injury to the posterior cruciate ligament (PCL) can range from a stretch to a total tear or rupture of the ligament. These injuries are less common than anterior cruciate ligament (ACL) injuries as the PCL is broader and stronger. ⠀ The PCL is one of the two cruciate ligaments of the knee. It acts as the major stabilizing ligament of the knee and prevents the tibia from excessive posterior displacement in relation to the femur. It also functions to prevent hyper-extension and limits internal rotation, adduction and abduction at the knee joint. The PCL is twice as thick as the ACL which results in less injuries than the ACL due to the stronger nature. As a result, PCL injuries are less common than ACL injuries. ⠀ It originates at the internal surface of the medial femoral condyle and inserts on the center of the posterior aspect of the tibial plateau, 1 cm below the articular surface of the tibia. It crosses the ACL to form an 'X'. The PCL consists of two inseparable bundles: the wide anterolateral (AL) bundle and the smaller posteromedial (PM) bundle. The AL bundle is most tight in mid-flexion and internal rotation of the knee, while the PM bundle is most tight in extension and deep flexion of the knee. The orientation of the fibers varies between bundles. The AL bundle is more horizontally orientated in extension and becomes more vertical as the knee is flexed beyond 30°. The PM bundle is vertically orientated in knee extension and becomes more horizontal through a similar range of motion. ⠀ Posterior cruciate ligament (PCL) injury can cause pain, swelling and a feeling of instability. PCL reconstruction can significantly improve symptoms in selected cases.