The patient’s knee joint had been inverted deformity, with severe limitation of flexion and extension, and X-ray examination showed: bone cumbersome formation at the edge of the joint, and narrowing of the joint space. This can only be completely cured by surgery. Why can only surgery be completely cured? Because there is cartilage on the surface of normal bone joints. It is what we call brittle bone in our daily life. Articular cartilage is a smooth, elastic, weight-bearing tissue. There are no nerve fibers on the surface of cartilage, so normal weight-bearing joints such as knee joints can walk and exercise normally. Patients with osteoarthritis, on the other hand, will have cartilage wear and tear. Mild osteoarthritis, accompanied by free bodies in the knee and meniscus injuries, can undergo minimally invasive arthroscopic surgery. Arthroscopy, and once the development of severe osteoarthritis, articular cartilage 4 degrees of damage, the subchondral bone is completely exposed, because the subchondral bone surface distribution of rich nerve fibers, once exposed, by a certain degree of compression, the pain occurs, it causes severe osteoarthritis patients can not walk on the ground. In general, osteoarthritis can be relieved by conservative treatments such as medication and injections. However, due to the irreversibility of cartilage wear and tear, that is to say, once the cartilage wear and tear occurs, and then take medication and injections, the cartilage that has been worn out can not be regenerated. The purpose of injections and medications is only to slow down the course of osteoarthritis. Severe osteoarthritis, even if you then take drugs, injections, the effect is only to stop the pain, so that your pain paralysis, but on the joint cartilage, are not going to have any effect, and will not let the cartilage regeneration. Therefore, this part of the patients and friends, it is recommended to early joint replacement surgery. The joint replacement surgery carried out by Prof. Lei Zhongmin, Director of Orthopedics Department of Beijing Hospital of Traditional Chinese Medicine affiliated to Capital Medical University, has a short operation time, small incision, less bleeding and fast recovery. It has enabled many patients who are unable to walk to resume their daily life and even return to sports.