Whether the meniscus anterior horn injury and posterior horn injury is serious or not is decided according to the degree of injury, the third degree of injury is the most serious. Meniscus anterior horn injury is divided into three degrees, of which the third degree of injury is the most serious, mainly in flexion and extension of the anterior knee pain, there will be joint popping and joint strangulation, meniscus damage to the edge of the joint, this situation needs to be taken to meniscus repair surgery. The posterior horn of the meniscus injury is also divided into three degrees, the most serious is the third degree, mainly when the knee joint pain in flexion, can not squat, need to take meniscus repair or suture surgery. Meniscus injury also depends on the site of injury, if in the red zone, blood flow is rich, easy to heal, if in the white zone blood flow is poor, slow healing. Therefore, meniscus injuries are graded specifically according to the MRI films, and generally the third degree is the most severe and requires surgery.