Ligaments connect bone to bone and help provide stability within a joint. There are different levels of sprains to a ligament and if the injury is significant a tear may result. Some ligament tears may require surgery. It is possible to damage more than one ligament in the same incident. Ligament Injuries commonly occur in the shoulder, knee, and ankle. The most common ligament injuries in the knee include the anterior cruciate ligament (ACL), medical collateral ligament (MCL), and less commonly the lateral collateral ligament (LCL), and the posterior cruciate ligament (PCL). Physical therapy can help patients with ligamentous injuries to help strengthen structures surrounding the joint. Patients will also benefit from physical therapy post surgery to help ensure a quick and complete recovery.