I. Introduction of knee surface replacement surgery Knee surface replacement surgery is a medium-sized surgery in knee surgery, which is still considered a minor surgery compared with the surgery of severe joint injury of knee, the surgery of simultaneous reconstruction of anterior and posterior cruciate ligaments of knee, and the surgery of combined osteochondral and meniscus transplantation of knee. Therefore, there is no need to be too afraid of surgery for patients who are going to undergo surface knee replacement. Another reason why many patients are afraid of surface knee replacement surgery is because they mistakenly believe that they will have to remove all of their joints and replace them with artificial joints. In reality, the surgery only removes a layer of the damaged surface of the patient’s joint and places an artificial joint of the same thickness on the surface of the lesion. This is strictly a surface replacement of the damaged joint, not a removal of the entire joint. A third concern of patients is that they will be immobile for a long time after the knee surface replacement surgery and will need to be cared for. This concern is also superfluous. In the routine after knee surface replacement in Shenzhen Pingle Orthopaedic Hospital, patients can walk on the third day after surgery for a short period of time with the help of crutches, and thereafter the range of activities increases day by day. One week after surgery, patients can wash their faces, go to the toilet and do some necessary things by themselves. Generally speaking, one week after surgery, patients can complete the most basic self-care of life. There are also some patients who are understandably afraid that the surgery will fail. However, if patients know that the knee surface replacement surgery is based on instrument positioning and that the surgical steps are repeatable for each patient, they will be comfortable with the procedure. This is because every intraoperative operation is instrument-positioned and is regulated, not something that the surgeon can do on a whim. Of course, a few special patients will be encountered, and the special characteristics of the patients can be solved by careful preoperative design and intraoperative operation adjustment. The years of use of the artificial joint after surgery is also one of the most important concerns of patients. The design and materials of the current knee surface replacement prosthesis have been passed. In other words, in 100 patients, the replacement joint is still intact in 90 patients 20 years after surgery. The purpose of knee surface replacement surgery is to relieve the patient’s pain. Although anti-inflammatory pain medications can also relieve pain, in patients with severe arthritis, the effect of the medication is short-lived and the pain will return once the medication is stopped. This problem is completely resolved with a surface knee replacement. Improved knee function. Patients with severe osteoarthritis often have severely compromised knee function, such as the inability to squat or straighten. With a surface knee replacement, the knee joint can move freely. Improves the patient’s quality of life. Because of the pain and limited function, patients often have a difficult life before surgery. For example, because much activity can cause swelling and pain in the knee joint, many patients tend to stay out of the house as much as possible and are afraid to exercise or go outside. Even going to the bathroom can be limited because they can’t squat down. After knee surface replacement patients can then engage in walking, stationary bicycling, swimming, ballroom dancing, golf, weight lifting, walking at a certain speed, billiards, bowling, rowing, cross-country skiing, some fitness exercises, road cycling, jazz dancing, ice skating, and two-person tennis. Prevent secondary deterioration of general health and prolong life. Patients with severe osteoarthritis tend to have minimal activity, and some are even wheelchair bound on a regular basis. A prolonged reduction in activity will lead to weight gain (which will be heavier on the joints), osteoporosis, decreased respiratory function, decreased cardiovascular function, and rapid muscle loss in the limbs. This will inevitably lead to a significant decrease in the patient’s physical fitness. If the limitations imposed on the patient by the disease are not addressed in the long term, the patient’s health condition will deteriorate. Prevent the damage caused to the patient by long-term medication. Some patients who have been refusing surgical treatment for their disease and the ineffectiveness of medications and physical therapy have to rely on medications for a long time to relieve their pain. Many patients have developed chronic gastritis as a result of long-term stomach irritation, and some have had their stomachs perforated by medications, requiring emergency surgery. The liver side effects of the drugs have also led to drug-induced hepatitis in some patients, and some patients have developed drug-induced renal impairment. Protection of the contralateral knee joint. Many patients have only one leg at the beginning of the disease, and because of the long-term pain in the affected joint, they are afraid to put weight on it, so the main burden of walking and various activities naturally falls on the opposite healthy leg, and over time, the healthy side begins to show osteoarthritis manifestations such as pain and swelling because of the long-term burden, and when they decide to undergo surface knee replacement surgery, the original healthy opposite leg becomes the diseased leg. If you decide to have surgery in time after non-surgical treatment is ineffective, you can protect the health of the healthy side of the knee by carrying weight equally on both knees after surgery. Because of the use of minimally invasive techniques in knee surface replacement, knee surface replacement surgery is no longer considered major surgery, but even so, we are always very strict about the indications for knee surface replacement surgery. Our indications for surface knee replacement. That is, if a patient with osteoarthritis or rheumatoid arthritis has a condition that meets all six of the following criteria, a surface knee replacement is recommended in order to prevent the patient from having to undergo a second surgery after surgery. These six conditions are: 1, osteoarthritis of the knee joint pain, swelling and up and down the stairs knee joint hit soft can not force, etc. has affected daily life and necessary activities, by Chinese and Western medicine treatment is not effective. 2, the knee joint has “O” leg or “X” leg, that is, the knee inversion or knee valgus and other deformation changes. 3. Narrowing of the medial or lateral joint space of the knee joint. 4. Restriction of knee flexion and extension. The angle of flexion or extension of the knee has begun to affect daily life and work. 5. Severe bone formation and osteochondral destruction are visible on x-ray. 6. Age is 55 years or older.