Which diseases are suitable for artificial hip and knee joint replacement After the 1980s, the rapid development of artificial joints was promoted by the research progress in biomechanics and material science. The design of prosthesis, surgical operation technique, perioperative treatment and postoperative rehabilitation of artificial joints have become more and more perfect and mature, and the success rate of surgery has been greatly improved, with the excellent rate of 10 years after surgery reaching more than 95%, and the excellent rate of 20 years reaching 85%-90%, which has greatly encouraged orthopaedic surgeons to apply artificial joints for the treatment of joint diseases and injuries. More patients have confidence in the excellent results of artificial joint replacement and are willing to accept artificial joint replacement. Which diseases are suitable for artificial joint replacement or which diseases will achieve better results with artificial joint replacement? This article is divided into two parts: First, suitable for artificial hip replacement disease: 1, hip fracture ① femoral neck fracture with displacement, the older. ② old fracture of femoral neck, due to various reasons of delayed treatment or conservative treatment after the fracture does not heal or ischemic necrosis of the femoral head. Traumatic ischemic necrosis and collapse of femoral head. Patients with femoral neck fracture who are in poor general condition and should not stay in bed for a long time. ⑤ Artificial hip replacement in the early stage of acetabular fracture is only suitable for the elderly patients who have poor results after the expected incision reset and internal fixation surgery. 2.Patients with osteoarthritis (or osteophyte) of hip joint who have night pain and the effect of painkillers is not good, which affects their work and life. 3.Femoral head ischemic necrosis, the femoral head has collapsed, pain, dysfunction. 4, Hip dysplasia or hip dislocation of middle-aged and old people, the emergence of pain in the affected hip or lumbar pain. Total hip arthroplasty can be considered. 5.Rheumatoid arthritis hip pain, drug effect is not good or appear hip deformity, dysfunction. 6, ankylosing spondylitis hip joint lesion, drug effect is not good, or hip deformity, dysfunction. 7, Hip joint infection, surgery, residual joint ankylosis after surgery hip joint ankylosis appear lower back pain. Pseudo-fusion with pain or non-functional fusion after hip fusion surgery. 8, other diseases of the hip joint, invalid by conventional treatment. Diseases suitable for artificial knee joint replacement: 1, knee osteoarthritis (or osteomalacia) pain aggravation, the effect of drugs is not good. 2.Traumatic osteoarthritis of knee joint after trauma or meniscectomy with pain and poor drug effect. 3.Rheumatoid arthritis of knee joint pain, drug effect is not good or appear joint deformity, dysfunction. 4, Knee joint infection, trauma, residual joint ankylosis after surgery, lower back pain or pain in the healthy hip or knee joint; pseudo-fusion with pain or non-functional fusion after knee joint fusion surgery. 5.Other diseases of knee joint. Modern artificial joint replacement technology is a revolutionary progress of orthopaedic surgery in the twentieth century, especially the application of artificial hip and knee arthroplasty, which can quickly relieve pain, quickly get out of bed, reduce the serious complications and mortality of long-term bed rest, and improve the quality of life of patients. When we apply this high-tech technology, we should also be soberly aware of the fact that any surgery is subject to complications. In order to maximize the benefits and minimize the damages, doctors should strictly control the application of surgery, standardize the operation and actively prevent and control complications to achieve better long-term results and benefit the patients.