At present, as China enters an aging society, the incidence of osteoarthritis is increasing, so the number of patients with internal and external deformities is also increasing, many elderly people, especially old women have different degrees of knee deformity, the disease itself brings pain, dysfunction seriously affects the life of patients, in addition, also affects the aesthetic, with the progress of the disease, the degree of deformity will aggravate, so in advocating Therefore, in today’s world of quality of life, most patients should take a proactive approach to treatment. When the disease first occurs, conservative treatment can be taken, such as osteoarthritis, through reasonable exercise, joint protection, the use of nutritional cartilage and pain medication, joint lubricants, etc., to control the progress of the disease, when there is a significant internal and external deformity, severe pain and pain medication can not be controlled, the basic function is limited in the case of surgery should be considered to completely solve the problem. For internal and external derangements caused by long bone deformities that do not involve the interior of the joint, osteotomy can be used to correct the deformity; while for patients with deformities caused by arthritis, the most appropriate approach is artificial knee replacement, which can completely eliminate pain, correct the deformity and, through rehabilitation, regain the ability to perform daily life. As for the specific issues – such as prosthesis selection, surgical access, etc. – a thorough examination should be performed by the surgeon to assess not only the degree of deformity, but also the integrity and function of the tissues surrounding the knee (e.g., ligaments, muscles, etc.) and to take x-rays to assess the skeletal condition.