The posterior cruciate ligament (PCL) is a stronger and larger ligament that connects the thigh bone to the shin bone. Injuries that tear PCL also affect other ligaments or cartilage in the knee. Sometimes underlying bones also may be broken. PCL injuries are caused by falling on the knee when it is bent or striking the knee against a hard surface and is common among people involved in sports. PCL injury is identified with swelling and pain in the knee, wobbly sensation in the knee and trouble in walking. Physical examination and imaging tests help in diagnosis. Physical therapy has to be started immediately. Usage of crutches and knee brace are recommended. Surgery is performed only if other forms of treatment are ineffective.