I. What is artificial knee replacement?
The diseased femoral and tibial articular surfaces are partially resected and replaced with alloy artificial knee articular surfaces.
II. Why is this surgery needed?
- Restore the original smooth and normal angle of the knee joint and relieve joint pain.
- Improve the quality of life.
III. Preparation before surgery:
- The preoperative tests includes electrocardiography, chest x-rays, and blood tests.
- The doctor will explain the process and the purpose of the operation to the patient and family. The patient will sign an operation consent form, anesthesia consent form, blood transfusion consent form, and self-pay consent form.
- In order to observe the patient’s skin color during anesthesia, prior to operation, nail polish and lipstick must be removed.
- To avoid anesthesia risk of vomiting, the patient cannot eat or drink anything for at least eight hours before surgery. After patient returns to the ward, the eating instructions must be followed.
- On the morning of surgery, the patient will change into a surgical gown and will be required to remove dentures, watches, and jewelry, etc.
IV. Post-operative care:
- The patient must keep his/her knees straight. If the leg swelling is severe, pillows can be used to elevate the calf. Do not place pillows under the knees.
- To prevent pressure injury, the patient should change position at least every two hours.
- Ambulation is suggested on the next day after surgery. When you are the first time of ambulating, your nurse will assist you and teach you how to use the crutches or walkers (More information: Use of Crutches or Walker).
- Ankle pumping: Move your ankle all the way up and all the way down. Rotate your ankle left and right. Repeat 10 times per hour (Figure 1).
- Quadriceps sets: Lie on back with legs straight. Tighten the thigh muscles by pushing the back of the knee down into the bed. Hold the contraction for five seconds and then release. Repeat 10 times(Figure 2).
- Knee flexion and stretch exercise.
- Lie down and flex the operated leg, then slowly stretch it out as much as possible (Figure 3).
- Follow the doctor’s order to use a continuous passive motion (CPM) machine once or twice a day for about 15 minutes to help the knee flexion and stretch. Applying an ice pack and pressure on the affected leg may relieve the pain and swelling (Figure 4).
- Sitting on the edge of a bed or chair, place the good limb in front of the operated leg at the ankle, and apply downward pressure for five seconds. Next, raise the operated leg and stretch for five seconds, then slowly put it down. Repeat 10 times. 3-5 secessions per time(Figure 5).