Hip arthroplasty, commonly used to treat hip osteoarthritis, femoral head necrosis, congenital hip dislocation, refractory hip fractures or hip fractures in elderly patients, and hip tumors. Complications after hip arthroplasty include wound infection, hip dislocation, deep vein thrombosis, periprosthetic infection, and pulmonary embolism. Although the incidence of periprosthetic infection is low, it can be a disastrous complication for the patient if it occurs. At present, according to the patient’s condition, the patient can generally walk on the ground with the aid of a walker 3-5 days after hip arthroplasty, and avoid squatting, cross-legged and cross-legged movements for 6 weeks after the operation, and practice squatting, walking 2km per day, cross-legged and other functional exercises about 6 weeks after the operation according to the patient’s condition; come to the hospital for review in 1, 2, 3, 6 and 12 months after the operation, and annually thereafter. Knee arthroplasty is commonly used for osteoarthritis of the knee, traumatic arthritis and bone tumors around the knee. Complications after arthroplasty include wound infection, deep vein thrombosis, periprosthetic infection, and pulmonary embolism. Although the incidence of periprosthetic infection is low, it can be a catastrophic complication for the patient if it occurs. At present, according to the patient’s condition, the patient can generally walk on the ground with the assistance of a walker 3-5 days after hip replacement, and actively or passively contact the knee joint flexion and extension activities, and generally practice squatting, walking 2km per day, cross-legged and other functional exercises about 4 weeks after surgery; come to the hospital for review in 1, 2, 3, 6, 12 months after surgery, and once a year afterwards.