The knee joint is one of the most important weight-bearing joints in the human body, and is prone to accidental injury in life and sports. If reasonable functional training is not performed in a timely manner after injury, it often lays a hidden risk of dysfunction for normal life in the future. The following is the knee This is a method of self-practice straightening, the affected limb heel pad 10-15cm, in the distal thigh pressure weight (neither above the patella nor the proximal calf), the weight of the weight to 30 minutes to reach. This is also a way to practice straightening on your own, lying on the edge of the bed, using soft pillows to pad up the knee or empty outside the bed, hanging weights at the ankle, the rest of the requirements are the same as the above method, this method has a longer calf self-weight force arm, so the stimulus is stronger than the previous method, requiring especially relaxed, not “harder”. This is a method for others to assist in practicing the straightening function, the basic posture is similar to the first method, the helper stands on the side of the affected limb, hands pressed down on the distal thigh to strengthen the straightening angle, pay attention to the techniques must be used to prevent injury to their own wrist joints. This method should avoid violent pressure and still be implemented with gentle and lasting force. The basic posture is similar to the third method, with the helper standing on the side of the affected limb, pressing the fixed hip with one arm, holding the ankle of the affected limb with the other hand, and pulling it forward and downward in the direction of the black arrow, which can relieve the squeezing pressure on the subpatellar fatty tissue and synovial membrane when pressing for straightening, and relieve the pain in front of the patellar tendon. It is especially suitable for patients who have a “squeezing sensation” in front of the joint when practicing extension. If you feel that the patient is not fully relaxed or has a high tension in the N cord tendon before the exercise, you can make the patient do the N cord muscle maximum strength isometric resistance 2-3 times, this method can play a role in inhibiting antagonistic muscle tension and appropriate pulling.