With the aging of the population, the elderly gradually increase, we often see the elderly in the park district in walking, playing Tai Chi and other activities. But some elderly people obviously have inflexible feet, squatting to pick up things are very difficult, some even lower limbs are already obvious rotund legs, the pace of hobbling, perhaps young people look, think there is nothing, old well, it is so. Is this really the case? What is the cause of this? Is there no way to change it? We normal people use our knee joints for every step we take, so the pain caused by a knee lesion or injury can make people feel discouraged about life. People who do not have knee pain do not know the pain of people with severe knee pain, who have difficulty moving around, walking up and down stairs, and cannot walk normally, which seriously affects their quality of life. Even small things like squatting down to get a newspaper can be difficult because of the pain. This kind of knee pain is mostly triggered by diseases such as osteoarthritis and rheumatoid arthritis, which cause the cartilage in the joint to peel off and wear out and degenerate, gradually leading to joint deformation and smaller joint gaps, and the pain is severe when the patient walks. Early conservative treatment still has a certain effect, but in the late conservative treatment effect is often poor; many elderly people seek secret prescriptions everywhere for treatment, the result is a lot of money spent, but the disease is not cured, more unfortunate is long-term medication damage to their gastrointestinal. The best treatment available is “total knee surface replacement”, a safe and effective procedure that for many patients means the ability to resume pain-free activities. At first glance, people find this surgery scary, thinking that it is the removal of a human knee joint and replacing it with an artificial one, will it be very traumatic and slow to recover? How will the healing effect be? These questions cause many elderly patients to be afraid to undergo this type of surgery because they would rather suffer from knee pain all year round. In fact, the artificial knee surface replacement is one of the greatest inventions of the twentieth century, and after decades of rapid development, the technique has become very mature and the procedure is not complicated. Most patients can walk with the help of a walker 24 hours after the joint replacement, independently after 2 weeks, and normally after one month. Currently, knee prostheses made of new materials generally last more than 20 years in normal use, but obesity or excessive physical activity can reduce the life of the prosthesis accordingly. The most serious risks of knee arthroplasty include deep vein thrombosis in the lower extremities and joint infections, but the incidence of these complications has been reduced by the combined efforts of arthroscopists worldwide. In short, there is no need to remain with knee pain for the rest of your life. Total knee surface replacement will not make you young, but the procedure can effectively relieve knee pain, improve knee function, greatly improve quality of life, and give older patients a new lease on life.