(1) Early postoperative rehabilitation training program The purpose is to increase blood circulation in the lower limbs, prevent deep vein thrombosis in the lower limbs, increase muscle strength, increase joint mobility, and prevent hip dislocation and prosthesis loosening. 1. 2d postoperative recumbent exercise (both lower limbs are in 15° external booth) (1) Double ankle exercise: do extreme dorsiflexion and plantarflexion of both ankles, which can be started 3 times a day for 5-10min each time after surgery, and you can move around whenever you have energy. In addition, you can also do ankle inversion activities. All these activities can strengthen the calf muscles to promote the reflux of the deep veins of the calf and avoid thrombosis. (2) Exercise of both knees and thighs: firstly, exercise the quadriceps, isometric contraction training of quadriceps, 3 groups per day, 10 – 20 times/group, each contraction maintained for 5-10s. relax for 5-10s. secondly, isometric contraction training of gluteus and active knee flexion, gradually increase the number of flexion to achieve the purpose of passive hip flexion. On the basis of the first two exercises, train the lower limb on the affected side to do active straight leg raising, contracting the thigh muscles 3 times a day for 10 min. at first, it may not be possible to raise it, but insist on it every day until the affected limb can be raised off the bed, maintaining it for 10 s. Repeat the exercise, the hip elevation should not exceed 45°. Make necessary preparations for walking on the ground. 2~3d after surgery, the patient should slowly sit up in bed and rock the bed 30°~45° to play the role of passive hip flexion. 2.3~4d postoperatively (1) lying down with the help of the lower limb on the affected side draped on the side of the bed, the lower limb may be swollen and have a feeling of holding pain. At this time, lift the lower limb to the bed and resume the original position, repeat several times to achieve the preparation before the affected limb adapts to resume standing on the ground. (2) On the 3rd day of unilateral total hip replacement, you can sit on the bedside, with the leg on the healthy side first off the bed and the foot on the ground, the calf of the affected limb drooping, and the hip joint abducted and flexed <45°. If there is no dizziness and other reactions, you can stand with a walker under escort to adapt to the change of position. Avoid falling due to postural hypotension, if there is no discomfort, start walking training with a walker under escort. (3) After bilateral total hip arthroplasty, depending on the recovery of physical strength, the walker can be used for standing training in 3-4 days after surgery, and partial weight-bearing walking training can be carried out if conditions permit. Exercise the lower limbs in bed, flexion and extension of the hip. (4) When standing, you should also do hip abduction activities to exercise abduction muscle strength. 3.4 days~6 weeks after surgery (1) Continue the above training. (2) Stand up training in the balance bar or with a walker. If the head is not dizzy and can stand steadily, you can do hip flexion of the affected limb, passively make the knee flexion, gradually increase the degree of activity, but small to flex the hip more than 90°. Then extend the hip for closed chain movement to bear part of the weight. (3) Walk on the ground with a walker or double crutches of the affected limb. First walk indoors for a short distance, then walk outdoors. In patients with cemented total hip replacement, the initial stability is strong and the affected hip can be partially weight-bearing after surgery. Patients with non-cemented total hip replacement can get up and stand up after surgery, and walk without weight on the affected limb under the protection of a walker. 4.7~12 weeks after surgery (1) After 6 weeks, the affected limb can gradually bear weight, generally 20% of the body weight, and after 12 weeks, the bone growth is basically completed and the joint stability is enhanced. Hip extensor and abductor muscle strength enhancement training or resistance training. (2) Gradually double crutches were changed to single crutches, and single crutches were used on the opposite side of the operated side. (3) Start to use handrails when going up and down stairs, using the healthy side first when going up stairs and the affected side first when going down stairs. (2) Intermediate and late rehabilitation Adequate healing of soft tissues and bone will continue for 1 year after surgery, with rehabilitation focusing on rebuilding the strength, muscular and cardiovascular endurance, and joint mobility needed to reach functional activity levels. After 12 weeks post-wood, functional exercises continue with hip flexion beyond 90°, gradually reaching 120° or 130°, extension up to O°, hyperextension up to 10° and internal and external rotational movements, with the goal of regaining the preoperative functional mobility of the hip. In order to enable the patient to live and work like a normal person, special attention should be paid to exercising the strength of the gluteus medius muscle of the affected limb in the lateral recumbent position, doing straight leg raising in the lateral recumbent position, and sandbags can be added to the affected limb to assist in exercising the gluteus medius muscle. Rebuild the muscle strength and muscle endurance of the operated leg or any involved part, emphasizing increasing the number of repetitions of exercise rather than resistance to improve muscle endurance. Improve cardiorespiratory endurance such as power biking, swimming, or water aerobics. Continue to pull in a postural manner to reduce flexion hip contracture. Gradually improve weight bearing, balance and correction of gait deviations while walking by starting or continuing to use a cane on the healthy side. When walking with a cane, walk on uneven and soft surfaces to improve balance function. Emphasize correct posture when walking: upright trunk, vertical alignment, and equal step length. The legs are maintained in a neutral symmetrical position; the cane is used continuously until weight-bearing limitations are eliminated, and also during prolonged walking to reduce muscle fatigue.