Injuries to ligaments are generally categorized into three degrees on MRI. First degree is when the ligament is only slightly damaged, usually not severe, and can be cured with conservative treatment. A second degree injury is a partial rupture of the ligament, usually no more than 50% of the ligament is damaged. A third-degree injury is a complete rupture of the ligament, which is more serious and usually requires surgery for reconstruction in order to be repaired. In the case of second-degree injuries, the severity of the injury is determined by the clinical examination. If the joint is stable on clinical examination, it can be treated conservatively by immobilizing the joint in a brace or cast, which is usually not very serious. If the joint is very unstable, surgery is needed, which is a more serious second-degree injury, and ligament repair with bone rivets or ligament reconstruction is necessary to achieve a more satisfactory result.