Arthroplasty is a procedure that replaces a joint that has lost function with an artificial prosthesis, allowing the patient to regain function. With the advent of artificial joints, many serious joint disorders have become relatively safe, less complicated, more effective, and more cost-effective. The goals of artificial joint replacement are as follows: 1. To relieve pain. 2. Stabilize the joint. 3. To correct deformities. 4.Improve joint function. I. Indications for artificial hip replacement surgery Displaced head-down femoral neck fracture, ischemic necrosis of the femoral head, hip dysplasia, rheumatoid arthritis, ankylosing spondylitis, hemophilic arthritis, psoriatic arthritis, post-traumatic arthritis, septic joint and tuberculosis involving the hip joint, etc. Second, the type of artificial hip replacement includes artificial total hip replacement and artificial bipolar head replacement. Artificial bipolar head replacement is suitable for elderly patients with femoral neck fracture, patients with poor physical condition and low mobility requirements, the operation only replaces the femoral head part, not the acetabulum, the operation will be less traumatic and the operation time will be shorter. Artificial total hip arthroplasty involves replacing both the femoral head and the acetabulum, and is suitable for patients with osteoarthrosis, hip dysplasia, femoral head necrosis, etc. The patient is relatively young and has high mobility requirements. During the operation, the choice of prosthesis is determined by the surgeon according to a series of factors such as the patient’s age, the morphology of the femur, the quality of the bone, and the number of operations. The artificial hip joint is composed of the acetabulum, liner, femoral stem and femoral head. The liner and femoral head form the weight-bearing interface, which can be metal to polyethylene, ceramic to polyethylene, ceramic to ceramic, etc. The metal used in the artificial hip joint is generally cobalt-chromium alloy or titanium alloy, which is very compatible with the human body and does not affect the MRI examination. As with other surgical treatments, there are certain complications of artificial hip replacement surgery, including cardiovascular accidents, anesthesia accidents, intraoperative bleeding, thrombosis, pulmonary embolism, lower limb venous thrombosis and other systemic risks, but their incidence is relatively low. The risk of the surgery is minimized. Complications of hip replacement include infection, wear, loosening, dislocation, intraoperative and postoperative periprosthetic fractures, cement reaction, metal allergy, peripheral tissue damage, local swelling, scar formation, periwound sensory abnormalities, etc. The incidence of these complications is generally low. Before the artificial hip replacement surgery, the doctor will communicate with you and your family to inform you of the method of surgery, the type of prosthesis, the possible results of the surgery, the possible risks, etc. Please evaluate carefully, understand carefully, make an appropriate choice, and work together with the doctor to cure your disease. V. Pre-operative preparation Before admission to the hospital you need to stop taking some medications that may affect the surgery, such as aspirin, Bolivar, reserpine, etc. If you are not sure, you can consult the orthopedic or anesthesiologist. After your hospitalization, your doctor will ask you about your general health and the condition of your diseased joints, and perform the necessary general examination and examination of your diseased joints. In addition, blood and urine tests, heart, lung, abdomen, liver, kidney and other organ function tests, ultrasound to check for lower limb vein clots, and a certain amount of blood to ensure the successful completion of surgery and postoperative recovery. The surgery can only be performed if the whole body examination is normal. If there are any irregularities, further tests and treatment will be required. After admission, you will be given anti-thrombotic, red blood cell raising, and over-the-top analgesic treatments to help improve the safety and outcome of the surgery. Three days before surgery, you will be given soap to scrub your hip and lower extremities and soak your feet to reduce the amount of bacteria in the surgical area and to reduce the possibility of infection.