Lateral collateral ligament injury usually refers to an injury to the lateral collateral ligament of the knee joint, and the mode of recovery is related to the severity of the disease, with common recovery methods including immobilization in a cast or brace, surgical treatment, and follow-up with rehabilitation therapy. Lateral collateral ligament injuries are usually caused by injuries sustained during strenuous activities, such as playing soccer, running, badminton, and so on. Injuries need to be treated according to the degree of injury, for 1 degree and 2 degrees of injury can be treated conservatively, such as plaster or brace immobilization. 3 degrees, 4 degrees should be treated surgically, after surgery, brace immobilization. After timely treatment at the early stage of the disease, ankle pump training, straight leg raising training, isometric muscle strength training, etc. can be carried out to reduce edema, maintain muscle strength and avoid venous thrombosis of the lower limbs. After 6 weeks to 8 weeks of fixation, the brace can be removed, and after removal, knee joint mobility training, weight-bearing training, muscle strength training, standing training can be carried out gradually. After the lateral collateral ligament injury, it is necessary to consult a doctor in time and standardize the treatment, and the rehabilitation training should be carried out under the guidance of the doctor to avoid secondary injury.