The day before surgery: You will need to take a hot shower, preferably with antibacterial body lotion; protect the skin in the surgical area from injury; stop eating after 10:00 p.m. and stop drinking 6 hours before surgery; sign a consent form for surgery, either by yourself or by a member of your immediate family; practice deep breathing, quadriceps contraction, and ankle pump exercises; and practice crutches. Surgery period (day of surgery): You will be taken to the operating room on a trolley by the operating room staff, usually early in the morning around 8:00 a.m. on the day of surgery; relatives may accompany you to the door of the operating room. Preparation: In the operating room, the operating room nurse will place the necessary devices to check your blood pressure, pulse, and breathing; establish intravenous access; and a tourniquet will be placed on your thigh to control bleeding during surgery. Anesthesia: The anesthesiologist begins the anesthesia procedure and will remain by your head throughout the procedure. Procedure: After sterilization and sterile sheeting, the surgeon will remove the damaged bone and cartilage through an incision in the front of the knee and then implant a new metal and plastic joint to maintain proper alignment and function of your knee. The procedure takes about 2 hours from the time the skin is cut to the time the incision is closed. After surgery, you will either be moved to the wake-up room for about an hour, where you will be monitored by anesthesia staff, and then returned to your room, or you will return to your room under the supervision of anesthesia staff. In the early post-operative period (up to three days after surgery): 1. There is a thick local dressing (usually a bandage and cotton pad) on the knee joint. 2. There is a surgical incision drainage tube that will be removed about 1-2 days after surgery. 3.There is an intravenous infusion tube, which is usually needed for 3-5 days, or blood transfusion if necessary. 4.Be careful not to stain the dressing of the incision by urinating and defecating in bed. 5.If the pain is severe, ask the surgeon to give appropriate painkillers; if a pain pump is placed, please use it as instructed by the anesthesiologist. Remember not to endure the pain, the surgeon will have a way for you to reduce the pain. 6. Follow the exercises taught by the surgeon before the surgery and start functional exercises as early as possible. Hospitalization: about one week Pain: You will feel pain in your knee after surgery. Your doctor will give you painkillers to make you as comfortable as possible. Deep breathing and coughing: To avoid pulmonary pneumonia after surgery, take deep breaths and cough often to clear your lungs, no less than 10 times per hour. Passive motion: To regain movement in your knee and lower extremities, your doctor will slowly move your knee while you are lying in bed using an apparatus called a Continuous Passive Motion Manipulator (CPM), which can be used to prevent edema, increase venous return to prevent venous thrombosis and maintain range of motion in the knee. This is usually done twice daily for half an hour, usually after the incisional drain is removed. If you have significant swelling in the lower extremity, your doctor will treat you with an inflatable compression band or recommend that you purchase special elastic leggings; if you have significant wound warmth, your doctor will treat you with ice packs. Active foot and ankle activities (ankle pump): This should be done immediately after surgery to promote venous return to the lower extremities, prevent edema and thrombosis, and also increase muscle strength so that you can walk down to the ground early.