1, knee straightening exercises: leg compression exercises: patients with knee flexion contracture deformity, take a standing or lying position, heel placed on a soft pad of about 30 cm, their own or others hands on the distal end of the thigh, uniform and continuous pressure to the back of the knee joint pulling sensation and pain when maintained for 3 min, alternating between the two legs, 5 times a day. 2, knee flexion exercises: seated knee flexion exercises: the patient sits on the edge of the bed, the legs naturally droop, flexor muscle group contraction to gradually flex the knee; lying knee flexion exercises: the patient is lying down, the heel to the hip movement driven knee flexion; climbing wall exercises: the patient’s buttocks to the head of the bed, the affected limb up, using the weight of the limb or foot on the wall crawl to help knee flexion. And you can draw a line on the wall to record the progress. 3, quadriceps isometric contraction exercises: knee active straightening: patients take a sitting position, hands back support or back against the wall, physical therapist placed one hand below the knee, the other hand placed in the distal thigh above, asked the patient to extend the knee tense thigh muscle, both hands feel the pressure under the knee and the contraction of the medial head of the quadriceps to evaluate the strength of the muscle. The contraction is maintained for 20 seconds each time, 10 times as a group, and 10 buttons can be taken out from the locket in separate sets to keep count. Practice 3-5 sets per day; Active straight leg raise: lower limb raise to heel about two fists high from the bed when the knee joint is actively straightened, again maintaining 10 seconds each time. If you can easily complete 5 sets of exercises per day (no muscle pain after completion), you can add sandbags at the ankle to strengthen muscle strength, sandbags from half a pound, according to each person’s ability to gradually increase, each time increasing half a pound, to three pounds to stop increasing the weight. Further strengthening muscle strength can be accomplished by increasing the number of sets of exercises per day or weighted squats and other exercises. 4, quadriceps isotonic contraction exercises: patients sitting on the edge of the bed, active knee flexion and extension exercises, pay attention to the knee extension will be completely straight as possible. 20 times as a group, 3-5 sets of exercises per day, easy to complete the daily exercise groups, can be tied to the ankle sandbags to strengthen muscle strength, the same method as above. Other muscle isometric or isotonic contraction exercises each contraction maintenance time, the number of times per group, the number of groups per day are the same as this. 5, squatting exercises: weighted squatting, 50-100 times / day (in order to knee pain-free principle) Note: (1) rehabilitation training should be carried out under the principle of pain-free; (2) 3 weeks after surgery before practicing up and down stairs, squatting.