Causes

Ligaments are tough, non-stretchable fibers that hold bones that span the knee joint together. The anterior and posterior cruciate ligaments in your knee give you stability on your feet. The most common cause of a PCL injury is a direct blow to the lower leg (tibia) while the knee is bent. This type of impact is often seen in automobile accidents when the driver or front passenger hits the dashboard just below their kneecap. It is also possible to tear the PCL in a severe fall on a bent knee.