I have now done a considerable number of patients with artificial knee surface replacement surgery, the post-operative results are very good, and the use of the original German production of the artificial knee joint of the activity platform (GMINI-MK2), this part of the patient is mainly elderly patients, osteoarthritis of the knee (OA). Knee osteoarthritis (OA) is a chronic progressive bone and joint disease that seriously endangers the health of the elderly, with the aging of the social population, the incidence of the disease is a significant upward trend, osteoarthritis (osteoarthritis, OA), also known as osteoarthritis degenerative, is a chronic joint disease characterized by degeneration of articular cartilage, destruction and osteophytes. The disease is more prevalent after middle age, with an incidence of 50% over the age of 60. The incidence of osteoarthritis in people over the age of 75 is 80%. The ultimate disability rate for this disease is 53%. Clinically, swelling and pain in the knee joint (with significant medial knee pain), osteophytes and limited movement (especially difficulty going up and down stairs) are most common. This kind of patient conservative treatment can only cure the symptoms but not the root cause, the best way to treat the late stage is to operate – to perform knee surface replacement surgery, the effect of surgery is remarkable, the following are a few patients I did pre-operative and post-operative X-rays presented to you: a 75-year-old female, bilateral knee pain for more than 10 years, walking are very difficult, first the right side is obvious, can not go up and down the stairs, mainly pain, radiography examination bilateral knee joint After finding me, she had a surface replacement of her right knee in 2012, and later the right knee did not hurt and could go up and down stairs, but the left knee pain was obvious. X-rays show obvious osteophytes, joint space narrowing, O-leg: this is her right knee X-rays after surgery, but the left side or inversion leg, pain is obvious, strongly requested me to help her do another foot this year I helped her do surgery, the following is my left knee surface replacement this year after X-rays: this is the right knee X-rays after two years: two, another patient female 69 years old, double knee joint pain for twenty years. This is her pre-operative x-ray: I operated on her after she was admitted to the hospital and used the original German-made artificial knee joints.