Many patients believe that they need to rest after a knee injury or knee pain and do not do any physical exercise. This may aggravate knee pain. Sports medicine experts found that people who do not exercise muscle atrophy and joint degeneration faster, exercise can effectively slow the rate of atrophy and degeneration. But the calcination needs to master the correct method, the wrong method, the more calcination knee pain. The general principle is to strengthen the muscles and bones while minimizing the load on the joint. Here are 2 convenient and effective methods of knee exercises. (Patients with injuries to the quadriceps and its tendons, patellar ligament injuries, and patients after anterior and posterior cruciate ligament reconstruction cannot do these two exercises in the early stage, but can do them later after the tendons and ligaments are repaired and healed.) 1, straight leg raise calcine, is a simple and easy exercise method: lying flat on the bed, the leg up, so that the muscles of the thigh tighten, taut, the lower limb will be lifted off the bed, and the bed at an angle of 15 degrees, or heel lift off the bed 15cm, maintain until you can not insist, and then slowly put down, so repeat, gradually, the number gradually increased to 60 times a day, can be divided into three periods of practice, each 20 times for each period. Continuous practice, to strengthen the knee joint resistance to load is very helpful, knee pain and swelling will also slowly reduce. 2, squatting against the wall, that is, static squat: is also another way to strengthen the muscles, effective protection of the knee joint. Back against the wall and stand, the heel is 1 foot away from the wall, two knees apart with shoulder width, or can be placed between the two knees a ball (can be a basketball or soccer), clamping the ball, the body slowly squatting along the wall until the thighs and calves into 120-100 degrees, adhere to the thigh muscles sore, and then slowly straighten the body, rest 1-2 minutes and again. Because the back against the wall, supporting part of the weight, the knee force is relatively small, and therefore safer. Repeat this, step by step, the number of calcinations per day increasing, to 30-60 calcinations per day, adhere to the practice, muscle atrophy around the knee joint will gradually improve.