After surgery for a torn collateral ligament of the knee, you can train through joint mobilization, muscle training, and ankle pump exercises. Knee collateral ligament tear includes medial collateral ligament and lateral collateral ligament, the postoperative training program is similar, and there are corresponding training contents in different time periods, which need to be arranged and guided by the rehabilitation professional doctor. 1. Joint mobility: After reconstruction or repair of the collateral ligament of the knee, there will be a significant decrease in joint mobility. Flexion and extension activities should be performed, 10 to 20 times can be completed, divided into morning and afternoon, can prevent joint adhesion, joint stiffness, and restore joint mobility as soon as possible. 2. Muscle training: patients can do quadriceps static contraction training after knee collateral ligament tear surgery, active contraction of quadriceps and maintain muscle tension for 3 to 5 seconds, 500 to 1,000 times a day to complete the action, to strengthen the bone and joint parts of the flexion, extension and weight-bearing function of the exercise, so as to pull open the contracture, adhesion of the ligaments and joint capsule. 3. Ankle pump exercise: patients after knee collateral ligament tear surgery can lie on the bed or sit on a stool, and carry out ankle straightening and dorsal extension. Require flexion and extension to reach the maximum angle and maintain 3 to 5 seconds, so that the muscles continue to contract, and complete 500 to 1,000 times a day, thereby promoting blood circulation in the muscles of the lower limbs. Training after knee collateral ligament rupture surgery should follow the principle of gradual and orderly progress, within the pain tolerable range of training, it is recommended that patients need to be in the regular hospital rehabilitation department for training.