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. By the year 2000, China’s elderly population had exceeded 130 million and will reach about 400 million by 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 in 2050 it will reach 160 million. In the 21st century, the focus of China’s aging work will be on the elderly over 80 years of age. The study of healthy longevity of the elderly involves many disciplines, and through the joint research of many disciplines, we will explore which factors related to personal, family, social, economic, environmental and genetic factors are conducive to or detrimental to healthy longevity, minimize the period of survival of the elderly with diseases, improve the quality of life in later years, and reduce the pain of the elderly, as well as the burden of the family and the society, so as 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 the 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? At present, it is believed that except for acute infectious diseases, active tuberculosis and blood system diseases, joint pain and serious dysfunction caused by many diseases can be treated by artificial joint replacement surgery (the patient’s age is still an important reference factor), mainly including: (1) joint deformity or joint destruction caused by osteoarthritis; (2) ankylosing spondylitis; rheumatoid arthritis resulting in loss of joint function; (3) severe comminuted fracture or fracture of localized joints; (4) joint pain or severe dysfunction caused by ankylosing spondylitis. (3) Serious 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) Non-healing or delayed healing of fracture of the femoral neck in old age; (7) Congenital dislocation of the hip joint resulting in joint pain; (8) Bone tumors in the area of the joints and the surrounding area. Second, why 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 dislocations, severe knee instability combined with osteoarthritis; (3) correct deformities: at the same time of artificial joint surgery, correct joint deformities, make the original joint unstable, and make the original joint unstable; (4) replace joints with artificial joints; (5) replace joints with artificial joints. (3) Correction of deformity: at the same time of the artificial joint surgery, the 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 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 a certain artificial joint. As for the current situation, the artificial hip joint and artificial knee joint have become very mature artificial joints both in terms of the prosthesis itself and in terms of surgical operation techniques; at the same time, the basic theoretical research and clinical application of the artificial elbow joint, the artificial ankle joint, the artificial interphalangeal joint and the lumbar vertebral intervertebral joint (or artificial intervertebral disc prosthesis) have also been greatly developed. 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 be “replaced” at will, and even if it is “replaced”, 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 surgeon decides when to operate) to restore function such as walking. The biggest 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. The strength and wear resistance of the artificial knee joint material is after hundreds of wear and tear experiments, high-quality imported artificial joints, such as the German LINK artificial joints, can generally meet the patient for more than 20 years. The artificial joints currently used in clinical practice have improved a lot compared to twenty years ago, and it is believed that more than 95% of the artificial joints that have been placed in the clinic for twenty years can continue to be used. 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 move around in a healthy and pain-free way!