Before practicing the mobility of the knee joint, the patient’s patella is usually examined, and the mobility of the patella gives a good prelude to the choice of what means to use when the patient’s knee joint is doing flexion rehabilitation. Based on the assessment of the soft tissue around the knee joint. In the joint around the first to do a little manipulation of the release, mainly with the local popping, through the moderate stretching to increase the flexibility of the collateral structures around the joint, can play a role in expanding the range of joint activities; in addition to increasing the joint mobility in the process of reducing the pain, put the risk of reducing. Knee flexion rehabilitation training methods include: 1, bedside leg drop: early training with the help of the bed, the use of the weight of the calf itself in the bedside, the calf down to see what degree of knee flexion, as far as possible to give a relative fixation above the knee, and then in the anterior edge of the tibia or ankle above the imposition of a certain amount of resistance to artificially increase the angle of the knee flexion, the increase in resistance is mainly set to the degree of patient tolerance; 2, mobility training. Mobility training: set the angle of passive flexion with the help of CPM machine, observe the patient’s facial expression changes during repeated training, if a painful expression is produced, the time can be shortened or the angle can be adjusted slightly smaller; if the expression is very relaxing, the patient can be given the passive knee mobility training according to the set angle; 3. Prone training: practice hooking the calf movement in prone position, which can be done by visualization. 3, prone position training: in the prone position to practice the action of hooking the calf, you can judge the approximate angle of joint flexion through visual observation; can also be fixed in the prone position in the popliteal fossa behind the upper part of the patient’s foot with the shoulder against the patient’s dorsum of the foot, to give the artificial passive increase in resistance, and then to expand the range of motion of the joints; the pain is relatively large, the young patients can accept, the older patients to restore the function of the knee joints, do not advocate the use of.