The posterior cruciate ligament (PCL) is one of the four major ligaments of the knee. It connects the posterior intercondylar area of the tibia to the medial condyle of the femur. The PCL prevents the femur from sliding off the anterior edge of the tibia and prevents hyperextension of the knee. Injuries to the PCL typically occur from direct blows to the flexed knee, falling on the knee, or hyperextension injuries. Treatment involves rest, bracing, and physical therapy, with surgery required for complete tears.