(I) Staged rehabilitation 1. Pre-operative rehabilitation Explain the surgery to the patient before surgery, introduce the post-operative rehabilitation program, teach the patient to perform long contraction movements of ankle pump contraction, quadriceps, N cord muscle and gluteus, and enhance the muscle strength training of lower and upper limbs. Train postural transitions and teach patients to walk with a 3-point or 4-point gait while holding crutches. Introduce postoperative movements and positions to be avoided. Psychological guidance, eliminate the patient’s fear of surgery and fear of rehabilitation. 2.Post-operative rehabilitation (1) Post-operative movements and positions to be avoided within 2-3 months after surgery Internal retraction. Postoperative bed position should be kept in external booth, put a pillow between the legs and a pillow on the outside of the affected limb to prevent external rotation of the hip joint; “crossing the legs”, squatting and putting on shoes and similar movements; straightening the affected hip, internal and external rotation position, such as turning over to the healthy side in the lying position; flexion of the hip greater than 90 degrees within 6-8 weeks. (2) Muscle training The isometric contraction training of the ankle pump, quadriceps, N cord and gluteus of the affected limb was started on the first postoperative day. Muscle strength training of both upper extremities and the healthy lower extremities, and breathing training should be started as early as possible and continued. Knee extension, abduction of the affected limb, and hip elevation, i.e., bridge exercise training, were started on postoperative day 5-6. On postoperative day 7, straight leg raising training and standing N cord muscle open chain training were started. Resistance training of the quadriceps, N cord, and gluteus muscles was gradually started as appropriate. The muscle strength training should be carried out without pain, and the frequency and intensity of training should be increased according to the patient’s condition. (3) Joint mobility training Active joint mobility training is performed 3-4 times a day for both upper limbs and the joints of the healthy lower limbs. Passive joint mobility training of the affected hip should be started 2-3 days after surgery, and active knee flexion and hip and hip abduction training should be started on the 5th-6th day after surgery. However, hip flexion should not be greater than 90 degrees, and avoid internal retraction, internal rotation and semi-flexion movements. (4) Weight-bearing and position transfer On the 2nd-3rd postoperative day, train the transfer from lying to sitting position. On postoperative day 5-6, transfer from bed to chair. On postoperative day 7, stand with two crutches and train to walk with two crutches or walker. Non-cemented 20% weight-bearing, gradually increasing to 100% weight-bearing after 6 weeks. The cemented type could be 100% weight-bearing; the mixed type could be weight-bearing according to the patient’s pain condition as appropriate for the non-cemented type. After 2 weeks of postoperative discharge, the muscle strength of the affected limb should be Ⅳ-V, the hip joint extension and flexion should be 00-900, the cemented group should be able to walk with weight with the help of crutches, and the non-cemented group should walk with partial weight with the help of crutches, and the patient should be able to take care of himself basically. 3.Post-discharge rehabilitation General hospital discharge 2 weeks after artificial hip surgery, before discharge, muscle strength, ROM, walking ability and other assessments should be conducted. Teach the patient the home training program, including continued strengthening of muscle strength, joint mobility, joint proprioception, balance function and daily living ability. It is important to emphasize the postoperative movements and positions to be avoided and to return to the hospital for rehabilitation 1-2 times a week for 3 months after surgery to ensure quality rehabilitation. Three months after the operation, the patient can take care of himself or herself in daily life and gradually resume sports activities. (2) Postoperative rehabilitation considerations The most important part of postoperative rehabilitation is muscle strength training after artificial hip replacement. We emphasize that postoperative muscle training should be started as early as possible after arthroplasty. On the first day after surgery, we should start to perform full-range flexion and extension exercises of the affected ankle joint and isometric contraction training of the quadriceps, N-flexor and gluteus muscles without pain. On postoperative day 7, 100% weight-bearing was started for the cemented type; 20% weight-bearing for the non-cemented type, and gradually increased to 100% weight-bearing after 6 weeks. According to the patient’s condition, the frequency and intensity of plyometric training and resistance plyometric training should be increased continuously. The early muscle strength training can also promote blood circulation in the lower limbs and prevent deep vein thrombosis. Joint mobility training should be carried out as soon as the pain subsides after surgery, and movements and positions that tend to dislocate the artificial joint should be avoided in the early stage of training. Due to the different accesses, types of artificial prostheses and prosthetic fixation methods of artificial hip replacement, and the individual differences of patients, the rehabilitation treatment must be different from person to person.