As people’s standard of living continues to improve, the functional requirements of the knee joint are also gradually increasing, and “knee replacement surgery” has been widely used in clinical practice as an effective treatment for osteoarthrosis of the knee joint. We have found that the degree of functional recovery of the knee joint after surgery varies, excluding the influence of the operator’s surgical level on function. The following is a description of the different stages 1. Before surgery, do your best to replenish nutrients and improve your health, as your appetite will not be too good for a few days after surgery, which will affect your normal nutritional intake. 2.On the postoperative day, due to the stimulation of surgical trauma and a certain amount of intraoperative blood loss, the patient will be weak, and at the same time, the gastrointestinal function caused by anesthesia has not fully recovered, so it is not advisable to eat a large amount of food, and can start feeding plain water 6 hours after surgery, which is beneficial to the protection of the gastrointestinal mucosa. After the implementation of pain-free wards, postoperative analgesic measures are in place, and some analgesic drugs are used locally or systemically during surgery, and patients will not feel obvious pain. In order to promote blood flow and prevent deep vein thrombosis, some auxiliary machines are currently used. Meanwhile, the accompanying person should make the patient’s ankle and toe joints move passively every 30 minutes or so. Patients should maintain a good state of mind and recuperate. 3. On the first day after surgery, as the effect of the anesthetic drugs used in surgery disappears and the patient’s mental state gradually recovers, start and gradually increase the feeding of liquid food, which is required to be warm and easily digestible, avoid high sugar foods, and eat little and often to prevent overburdening the gastrointestinal tract. The doctor will give the patient a passive activity of flexing the knee joint. The pain in the operated area will not be too strong due to the continuous effect of systemic analgesic drugs, which is the most effective way to prevent abnormal adhesions of the soft tissues around the joint. On top of this, the patient should also keep moving the knee joint actively to maintain the joint movement angle. 4. On the second day after surgery, the patient should be semi-sitting up in bed and can eat more normally, still advocating easily digestible food and to drink more water. While the effect of systemic analgesic drugs has not completely disappeared, the doctor will again give the patient passive functional exercises of knee extension and flexion, and make more than yesterday’s flexion angle, the patient’s pain will be more obvious than yesterday, which requires the patient’s cooperation. Afterwards, the patient must insist on independent activities to maintain the range of motion. The method is that the patient can sit on the edge of the bed with both knees flexed down and practice the extension of the knee joint. 5. On the third postoperative day, the patient should get off the floor with the help of a chaperone and walk on the bed. Drink more water before going down to prevent the occurrence of postural hypotension. To go to the toilet on their own and create opportunities to walk more. Increase nutrition. The patient’s gradually increasing activity has a positive effect on improving appetite and promoting eating. 6. On the fourth postoperative day, get out of bed frequently, support bed activities, practice heel lifting (tiptoeing) of both feet, and perform active calf muscle contraction to promote blood return to the lower limbs. At the same time, strengthen active or passive knee flexion exercises, if necessary, the assistance of the doctor is needed. 7.On the fifth day after surgery, support the walker to start large energy and wide range of activities and walking, and actively practice squatting to prevent abnormal adhesion of soft tissues around the knee prosthesis and prevent soft tissue contracture. 8. On the sixth day after surgery, if there are no abnormalities, you can be discharged from the hospital. Return to the hospital 2 weeks after surgery to remove the stitches. In general, you can try to walk on the ground three days after surgery, and you can walk freely with a walker one month after surgery, and you can leave the walker and walk independently three months after surgery, and basically restore the normal function of the knee joint six months after surgery.