Osteoarthritis of the knee (osteoarthrosis) is one of the most common joint diseases in the elderly, and is also the main cause of lower limb disability in the elderly, seriously affecting their daily activities and quality of life, up to 50% of those over 60 years of age. Among people over 75 years old, 80% of them suffer from osteoarthritis. Artificial joint replacement surgery has the following benefits: 1) significantly reduce or eliminate pain, 2) prevent or correct deformity, 3) prevent further aggravation of joint damage, and 4) improve joint function.