Knee joint injury, according to its damage, the following treatment methods can be used: 1, meniscus tear: generally use arthroscopy for treatment, the damaged meniscus suture, or meniscus replacement; 2, fracture: such as tibial plateau fracture or femoral condylar fracture, which requires surgery to open and reset, and may require steel nails or plates for fixation; 3, lateral collateral ligament injury: lateral collateral ligament injury can not be repaired, and muscle pulling injury can be recovered, while the lateral collateral ligament injury will lead to knee instability, for high-intensity sports, can not meet the sports standards. At this time, the lateral collateral ligament replacement surgery or artificial ligament repair may be necessary, in the knee joint medial or lateral surgery, the joint capsule is opened, the lateral collateral ligament replacement surgery.