For total knee arthroplasty, functional exercise plays an equally important role as surgery, as it relates to the future function and mobility of the knee joint, both to effectively prevent muscle atrophy and to alleviate postoperative pain by inhibiting the upload of nociceptive signals. Effective rehabilitation exercises can enhance quadriceps muscle strength, increase joint stability, avoid, reduce or delay joint degeneration, and improve the long-term outcome of knee surgery. Under the guidance of a physician, functional exercise should begin as early as possible and should be based on active activities, supplemented by passive activities. Rehabilitation after total knee arthroplasty should vary from person to person because of the patient’s physical condition, medical condition, psychological quality, subjective requirements, and surgical procedure. In addition, because patients who have received total knee replacements have a history of long-term knee pain, deformity, and dysfunction, functional exercise should be gradual and should not be rushed to avoid undue injury. All knee replacement patients should come to the hospital for follow-up after discharge at the following times: Caution: Total knee replacement is a major knee surgery and may be associated with postoperative discomfort such as fever and pain. Successful surgery is important, but only 50% of the time, the other 50% is dependent on the patient’s rehabilitation exercises. However, good function comes to a large extent from timely and correct rehabilitation functional exercises. Therefore, postoperative functional exercises should be performed as early as possible under the guidance of the surgeon, overcoming fears and inertia and other adverse emotions. 1.The methods and data provided in this plan are formulated in accordance with the general routine, and the specific implementation should be completed under the guidance of doctors depending on their own conditions and different surgical situations. 2.A certain degree of pain is unavoidable during the functional exercises. If the pain can subside to the original level within half an hour after the exercise stops, it will not cause damage to the tissue and should be tolerated. 3, muscle strength exercises should be concentrated until the muscle has a sense of soreness and fatigue, and then proceed to the next group after sufficient rest. The number of exercises, time, load depending on their own situation, and should be practiced at the same time the healthy side. Good muscle strength is a key factor in joint stability and a guarantee of good knee function and must be practiced carefully. 4.In addition to the proper braking protection of the operated limb, the rest of the body parts (such as the upper limb, waist and abdomen, and the healthy side of the leg) should be practiced as much as possible to ensure physical quality, improve the overall level of circulation and metabolism, and promote the recovery of the operated local. 5.Joint mobility (flexion and extension) exercises strive to improve the angle each time. If the flexion angle does not progress for a long time (>2 weeks), there is a possibility of joint adhesions, so great importance should be attached to it and insist on completing the exercises. 6, joint swelling will accompany the entire exercise process, swelling does not increase with the angle of practice and activity that is normal, until the angle and muscle strength is basically back to normal swelling will gradually subside. Sudden increase of swelling should adjust the exercises and reduce the amount of activity, and in case of seriousness, timely follow-up should be made. Note: The swelling of the lower limbs may be aggravated by the rehabilitation training, so please rest with the lower limbs elevated in a flat position.