Data provided by the China Association for the Elderly indicate that China has now become the country with the largest elderly population in the world. There are currently 120 million people over the age of 60. It is expected that China’s elderly population will reach 130 million in the year 2000 and about 400 million in the next century. The number of elderly people over the age of 80 in China will increase from 8 million in 1990 to 25.4 million in 2010, and will reach 160 million in 2050.The focus of China’s aging work in the 21st century will be on the elderly over the age of 80. The study of healthy longevity of the elderly involves many disciplines, through multidisciplinary joint research, to explore which factors related to personal, family, social, economic, environmental and genetic factors are conducive to or not conducive to healthy longevity, to shorten the survival period of the elderly with disease to the maximum extent possible, to improve the quality of life in later years, to reduce the pain of the elderly individuals, as well as the burden on the family and the society, to provide scientific basis for the decision-making and management of the national work of the aging. Osteoarthritis is an extremely common clinical condition. Osteoarthritis is an extremely common clinical disease, and its incidence increases greatly with age, the incidence rate of the age group older than 55 years is as high as 80%, with symptoms and activity disorders accounting for about 1/8, and artificial joint replacement is most suitable for people with joint dysfunction caused by osteoarthritis. Currently, artificial joint surgery has been increasingly emphasized. For millions of people, artificial joints, especially artificial hip joints, artificial knee replacement is a kind of successful surgery that can immediately relieve and eliminate joint pain, increase limb mobility, and improve patients’ quality of life. Especially for elderly patients, it can greatly improve the quality of life. The certainty and predictability of the efficacy of artificial joint surgery, so that more patients are happy to accept artificial joint surgery. I. Basic concepts: 1. What is an artificial joint? Artificial joint is a kind of artificial organ designed by people to save the joints that have lost their functions, and the artificial joint has the best efficacy among artificial organs. Generally speaking, the service life of artificial joint can be more than 20 years. 2.Which patients are suitable for artificial joint replacement surgery? It is currently believed that in addition to acute infectious diseases, active tuberculosis and blood system diseases, joint pain and serious dysfunction caused by many diseases, can be used for artificial joint replacement surgery (the patient’s age is still an important reference factor), including: (1) osteoarthritis caused by joint deformity or joint destruction; (2) ankylosing spondylitis; rheumatoid arthritis caused by loss of joint function; (3) (3) severe comminuted fracture or traumatic osteoarthritis; (4) loss of joint function due to infection, including special infection; (5) advanced aseptic necrosis of the femoral head; (6) fracture of the neck of the femur that does not heal or delayed healing of fracture of the neck of the femur in the elderly; (7) congenital dislocation of the hip joint resulting in joint pain; (8) bone tumors in the area of the joints and the surrounding bone. Second, why do we need artificial joint replacement? When structural changes occur in the joints due to various reasons, the use of medication alone is not desirable, because medication can only partially relieve the pain symptoms. Artificial joint replacement can achieve the following purposes: (1) relieve pain: relieve pain caused by various reasons; for example, pain caused by rheumatoid arthritis, joint destruction, etc.; (2) stabilize joints: stabilize joint instability caused by various reasons; for example, old joint dislocation, severe knee instability combined with osteoarthritis; (3) correct deformity: at the same time of artificial joint surgery (3)Correction of deformity: while performing the artificial joint surgery, the original deformity can be corrected and improved; (4)Improvement of joint function: the original stiffness and limited movement of the joint can restore the normal function of the joint. How to choose a good artificial joint? When a patient decides to adopt the treatment method of artificial joint replacement, a question often mentioned is: what kind of artificial joint is the best artificial joint? It should be said that different patients should choose different artificial joints. Artificial joint prosthesis has very strict requirements on the design of its form, surface treatment, material selection, manufacturing process and packaging; at the same time, it also needs sufficient clinical practice to confirm the effect of an artificial joint. For the current situation, artificial hip and knee joints from the prosthesis itself or from the surgical operation technology has become a very mature artificial joints; at the same time, artificial elbow joints, artificial ankle joints, artificial interphalangeal joints and lumbar vertebral intervertebral joints (or artificial intervertebral disc prosthesis) of the basic theoretical research and clinical applications have also been a great development. At present, in developed countries, all of the above artificial joints have been widely used in the clinic and achieved good clinical results. Choosing an artificial joint prosthesis is very different from choosing other commodities, because once the artificial joint prosthesis is put into the human body, it is not easy to “change” at will, and even if it is “changed”, the cost is quite large, which can’t be measured by money only. So how to choose a good artificial joint should be under the guidance of experts to make a careful choice. Fourth, the use of artificial joints and the efficacy of the human hip joint is an important joint, it has to walk, run, jump, squat and other functions, and it is also the burden of your body weight. Once the right hip joint is diseased, the cartilage of the joint will be destroyed, and the smooth surface of the hip joint will become rough or even defective, which will further deform the head of the femur. As a result, you will feel pain, have difficulty walking, have limited movement, limp, and sometimes have difficulty doing even easy movements. When the above diseases have progressed to a certain point and the joint has been destroyed, surgery is required. An artificial hip joint is used to replace the damaged joint (the decision of when to operate should be made by the doctor) to restore functions such as walking. The greatest benefit of artificial joint surgery is that it eliminates joint pain after surgery, greatly improves the function of the joint, and improves the patient’s quality of life so that he or she can work and live well during his or her lifetime. Currently, more and more patients are happy to accept the suggestion of artificial joint surgery as a treatment. The problem of the longevity of the artificial joint is determined by two main points: the wear and tear of the joint and the loosening of the prosthesis caused by wear particles. Artificial knee joint material strength and wear resistance is after hundreds of wear and tear experiments, high-quality imported artificial joints, generally can meet the patient more than 20 years. Currently used in clinical artificial joints and compared to twenty years ago has improved a lot, I believe that now the artificial joints placed in twenty years, continue to be able to use more than 95%. Successful artificial joint replacement surgery can enable you to live pain-free and fulfill your daily activities, and for the knee joint that has been destroyed, no other treatment method can achieve the same effect. Of course, the longevity of the artificial joint is also related to many factors, such as the amount of exercise the patient does, the choice of prosthesis, the surgeon’s surgical technique, and his or her own condition. The orthopedic community is currently working with engineers and material scientists, among others, to continually improve artificial joint materials, processes and surgical techniques. The future looks bright for patients who choose joint replacement to improve their quality of life and want to be healthy and pain-free.