First, it is necessary to qualitatively assess the injury of the patellar ligament, determining whether it is a partial or complete rupture, whether it is a simple rupture, or a compound rupture, the latter involving other injuries such as fractures or joint dislocations. The treatment of patellar ligament injuries, like other tendon injuries, follows the principle of "three earlies": early diagnosis, early treatment, and early rehabilitation. Early diagnosis has been mentioned before. Early treatment means that if surgery is needed, it should be conducted as soon as possible, as earlier surgeries often result in better postoperative recoveries. If surgery is not required, an immediate fixation with a cast or brace should be applied to keep the knee joint in an extended position, and this fixation should be maintained for three to four weeks. The third step is early rehabilitation. As the knee joint is immobilized during the fixation period, and pain and swelling starts to decrease, early functional exercises should be initiated, focusing on distal joint movement and muscular isotonic exercises, but avoiding flexion and extension movements of the knee joint. Early rehabilitation primarily aims to prevent muscle atrophy, prevent joint adhesion, and promote recovery from the condition.