Restoring knee function requires choosing the appropriate method according to the situation, there is no such thing as the most effective method. Recovery methods after knee injury generally include arthrotomy training, coordination training, quadriceps muscle exercise, etc. It is recommended to be carried out under the guidance of a doctor. 1. Joint mobilization training: The long axis of the femoral-tibial joint can be pulled and slid to the side, front and back, and back and front, and the knee can be extended and rotated, thus increasing the range of motion of the joint and decreasing the stiffness of the knee as well as the limitation of the activities in the later stage. 2. Coordination training: you can increase the coordination of the organs through isometric plyometric training and deep squatting appropriately. Isokinetic plyometric training refers to the use of isokinetic apparatus, according to the changes in the size of the muscle force during exercise, the machine provides matching resistance, so that the whole joint according to the pre-set speed of movement of a training method. 3. Quadriceps muscle exercise: straighten the knee joint after lying on the back and carry out the cycle of contraction and relaxation of the quadriceps muscle, which can be repeated 20-30 times to help restore the knee. All of the above methods should be carried out under the guidance of a professional doctor.