Proper exercise of the knee joint can make the quadriceps strong and powerful, and prevent quadriceps atrophy. However, it is also important to avoid excessive knee movement and excessive weight bearing when exercising. 1, quadriceps isometric contraction exercises, as strong as possible, tense thigh muscles for five seconds, and then relax once, do fifty to one hundred times per hour, and strive to reach a thousand times a day is better. 2, knee flexion and extension exercises, the knee first practice straightening exercises, and then lying down, the heel placed on a soft surface, their own or others hands on the distal end of the thigh, even and continuous pressure on the back of the knee joint, a sense of pulling and pain when maintained for three minutes. Alternate between the two legs, five times a day. 3, knee flexion exercises, do on the side of a relatively high bed or stool, the healthy leg under the affected knee leg, with the foot hooked underneath the ankle of the affected leg, that is, with the healthy leg holding the affected leg, the muscles of the affected leg completely relaxed, put the weight of the entire leg on the healthy leg, and then use the strength of the healthy leg to slowly downward in a controlled manner, the lower you put, the greater the angle of knee flexion of the affected leg, after feeling After feeling significant pain, stop and hold still for one to two minutes. These are some of the exercise methods for the knee joint, how to exercise, adapt to the population also need to consult a professional doctor.