The most important thing is to decide the severity of the injury, including simple soft tissue injury, joint capsule and ligament injury, fracture, etc., as follows: 1, simple soft tissue injury: active with the treatment, about two weeks to fully recover. 2, joint capsule and ligament injury: active with the treatment, about two months to fully recover. 3, fracture: because fracture healing is a long process, active cooperation with treatment, complete fracture healing, about 3-4 months. The anatomical structure of the knee is complex, and once the injury has occurred, active physical examination must be performed. Floating patella test, lateral stress test, drawer test, etc. need to be performed according to the patient’s pain location and the nature of the pain, combined with local plain X-ray, CT and MRI of the knee to clarify the severity of the injury and thus determine the corresponding treatment plan.