The history of artificial hip replacement is more than 40 years. With the continuous updating and improvement of the concept of artificial joint replacement and the improvement of the material and technology of artificial joints, the service life of artificial hip replacement has developed to a satisfactory level. However, the conventional artificial hip joint replacement for the elderly still has a large surgical risk and the functional recovery of the limb after the operation is slow. In recent years, on the basis of the conventional operation, the minimally invasive technique of artificial hip joint replacement with small incision has been developed, which is a new method of great practical value. The main methods are single-incision and double-incision techniques, mainly through controlled pressure reduction during surgery, improvement of surgical anatomical access, specially customized installation tools and fine operation during surgery, to achieve the purpose of small trauma and less bleeding. In Changzhou, our hospital was the first to carry out minimally invasive artificial hip replacement technology (OCM), and has carried out many cases of various types of small incision minimally invasive surgery and achieved good clinical results. The advantages are obvious: 1, small incision, small trauma and less bleeding. The incision of general artificial hip replacement is 16-22 cm long, while the minimally invasive incision is 6-8 cm long; the former has more bleeding, mostly above 800 ml, and mostly requires blood transfusion, while the latter has an average bleeding of less than 400 ml and generally does not require blood transfusion, thus also avoiding the problem of infection brought by blood transfusion itself. 2.Faster recovery of joint function. Patients who undergo traditional artificial hip replacement need to be hospitalized for 3 to 4 weeks, followed by 3 to 4 months of recovery; whereas patients who undergo small incision hip replacement are hospitalized for 3 to 5 days on average, with a recovery time of 1 to 2 months. A study in the United States showed that with the double-incision minimally invasive technique, 85% of patients could be discharged home on the first day after surgery, and 15% of patients were discharged the next day, significantly shortening the time required for postoperative joint function recovery. 3. Fewer complications reduce the risk of surgery. Most of the artificial hip replacements are performed on elderly people, who are prone to life-threatening complications, such as myocardial infarction, cerebral infarction or pulmonary infarction, due to different degrees of disease and degeneration of their own organs. Small incision hip arthroplasty reduces the complications caused by surgical injury due to the small trauma. 4. Light pain and beautiful incision. Surgical pain and the size of the incision have always been a concern for patients and their families. According to the American clinical research study, more than 68% of the artificial hip replacement patients care about the size of the surgical incision and whether it is aesthetically pleasing. 5. Reduce the economic burden of patients. Because of the shortened hospitalization time and reduced or no blood transfusion, thus reducing the economic burden of patients. Recently, based on the above-mentioned work, we have further developed single-incision minimally invasive total hip replacement (OCM, without cutting any muscle), which is truly minimally invasive. At the same time, the small incision minimally invasive technique can also be used for unicondylar knee replacement and artificial total knee replacement. The emergence of new technologies has improved surgical outcomes and clinical quality of care, and has placed corresponding demands on patients.