For young and middle-aged patients with advanced ischemic necrosis of the femoral head (stage III or IV), should they undergo artificial total hip arthroplasty? The answer is yes: as long as the advanced stage of osteonecrosis has been reached and the symptoms are obvious, artificial joint replacement surgery can be performed. This is because: 1, from the history of artificial joint development, modern artificial joints from the late 1960s, the development of more than 50 years of history, the early artificial joint life is how long? Including the operator have no number in mind, therefore, to determine the age of artificial joint replacement surgery, should be more than 65 years old, so that according to the average life expectancy of the population at the time (75 years), the artificial joint life of more than ten years, you can make the majority of patients to use to life. The long-term clinical results later confirmed that the majority of patients were able to use the artificial joint for more than twenty years after the artificial joint replacement. Therefore, for some middle-aged and elderly patients (between 55 and 65 years old), artificial joint replacement is also used to relieve their pain, and the clinical results are also very good. The vast majority of patients are able to use it for more than twenty years. Therefore, the age limit for surgery is advancing. 2, from the social level, young people are in the golden period of life, in the most critical period of study, life, employment, marriage, family and career, if they suffer from ischemic necrosis of the femoral head, they are bound to make great changes in their life trajectory and will not have a good life and work. Therefore, you should be relieved of the disease as early as possible so that you can lead a normal life, return to society, create greater value and strive for a better life development. It is of great significance to yourself, your family and society. 3, from the technical level, (1) modern artificial joint development so far, regardless of the prosthesis design, materials, processing technology and long-term clinical results are very good. Many artificial joint prosthesis clinical long-term follow-up results are very long life (85% of patients can use more than 20 years). The artificial joint prostheses we use today are more advanced and durable than the previous generation of prostheses. (2) Our operating rooms are now cleaner, which greatly reduces the infection rate of artificial joint replacement surgery, even lower than the infection rate in foreign countries. (3) The surgical instruments used in our surgeries are now very well matched and smooth, which ensures that the surgery is performed smoothly. (4) Our current surgical techniques are much better than those of our predecessors, and the success rate of surgery is very high. (5) Even if a problem arises after a certain number of years of artificial joint replacement surgery, even with the current revision techniques, most patients can resume a normal life again. In the end, if the osteonecrosis is already advanced, age is not the main factor in considering whether artificial joint replacement surgery should be performed, but rather the decision should be made based on the condition. It is important that the patient be relieved of his or her pain, return to society, and resume a normal life as soon as possible.