I. Combine work and rest, moderate exercise and sports. Exercise and exercise must be moderate, according to their own feelings and appropriate adjustments, not overworked. Avoid excessive stair climbing, mountain climbing and squatting. And pay attention to weight control, overweight is bound to cause wear and tear to the knee joint. II. Keep warm from cold. You can wear knee pads during the day. A cold knee joint can lead to aggravation of osteoarthritis symptoms, especially synovitis reaction will be aggravated. Wear fall pants early in the fall when it is cool and take them off late in the spring when it is warm. III. Long-term intermittent use of cartilage-nourishing drugs. You can take long-term and intermittent cartilage-nourishing drugs, such as glucosamine, chondroitin sulfate, etc. For non-steroidal anti-inflammatory and analgesic drugs (such as fentanyl, fotarine, etc.), you can take them intermittently during the painful time, but it is not beneficial to take them for a long time. Fourth, functional exercise 1. quadriceps (anterior thigh muscles) strength exercise method: at the beginning, sitting knee flexion, or supine position will be knee joint padding. Straighten the knee joint and keep it straight for 5 seconds and then relax, let the knee joint flex on its own, count the 1st time in your mind; then straighten the knee joint again and keep it straight for 5 seconds, then relax and let the knee joint flex on its own, count the 2nd time in your mind; …… until the exercise 10 times and then rest. The total number of exercises per day varies according to individual circumstances, generally 250-300 times. When you feel this exercise is easier, you can tie a 1 – 2 pounds of sandbags at the ankle. 2. N rope muscle (rear thigh muscles) strength exercise method: at the beginning, prone position will be straight knee joint. The knee joint will be bent hard, and keep the hard bending state for 5 seconds after relaxation, let the knee joint straight, the heart silent count for the first time; then again the knee joint will be bent hard, and keep the hard bending state for 5 seconds after relaxation, let the knee joint straight, the heart silent count for the second time; …… until the exercise 10 times after rest. The total number of exercises per day varies depending on the individual, generally 250-300 times. When you feel that this exercise is easier, you can fix a leather band at the foot of the bed, hook the ankle to the band and exercise the flexion knee joint. 3. lower limb muscle isometric contraction exercise method: “lower limb muscle isometric contraction” is to make all the muscles of the lower limb tense, but the lower limb joints do not contract due to muscle extension and flexion activities. This exercise method is generally used in the early post-operative period and does not lead to increased pain and bleeding. 4. Passive knee extension exercise method: supine position, heel pad high, so that the lower limb relaxed, so that the knee joint as far as possible completely straight. In the prone position, the upper part of the knee is padded, so that the lower limb is relaxed and drops naturally, so that the knee joint is fully straightened as much as possible. 5. Active knee flexion exercise method: supine position, try to flex the knee joint, so that the heel is close to the hip. 6. Passive knee flexion exercise method: supine position, put the thighs up, make the lower limbs relaxed, so that the lower legs under the action of gravity natural droop. Supine position, pull the ankle with a bandage, and pull up with both hands to the head end, so that the knee joint flexion. Sit on the edge of the bed with the thighs at the edge of the bed, so that the lower extremities are relaxed and the lower legs drop naturally under the effect of gravity. Stand, hold the head of the bed with your hands, gradually squat and flex the knee joint. Five, after discharge from the hospital should not be rushed to do running, basketball, badminton and other activities that can easily damage the knee; six, strengthen nutrition, strengthen the body resistance; seven, regular review, discomfort follow-up.