The anterior cruciate ligament (ACL) is major stabilizing ligament in the knee, which may tear with over use while playing sports. The ACL has poor ability to heal and may cause instability. Other common sports injuries in the knee include cartilage damage and meniscal tear. Knee injuries during sports may require surgical intervention, which can be performed using open surgical or a minimally invasive technique. Your surgeon will recommend physical therapy to strengthen your muscles, and improve elasticity and movement of the bones and joints.