Hello, meniscal injury is a very common disease, and arthroscopic meniscectomy repair of the knee is a common treatment modality, but proper postoperative rehabilitation exercises are an important part of good or bad postoperative results. The general postoperative rehabilitation is described as follows: There are four objectives of postoperative management: (1) To avoid swelling. (2) To restore joint function as early as possible. (3) To normalize muscle tone. (4) To allow the patient to perform normal activities and functional exercises. 1. Phase 1 The first week after surgery, light exercise is performed to prevent swelling. This phase of rehabilitation should be started in the recovery room after meniscectomy. The patient is encouraged to start exercises in the recovery room including straight leg raising and joint mobilization. 2. Phase 2 In the second postoperative week, rehabilitation focuses on joint range of motion. Sutures have been removed, and if swelling is still present, nonsteroidal anti-inflammatory analgesics may be used; isotonic exercises (straight leg raising) and gradual increase in range of motion should be routinely performed. The patient should regain the vast majority of mobility by week 2. If range of motion and muscle tone are restored, limited activities including walking can be performed. 3. Phase 3 In the 3rd to 4th postoperative week, more intense exercise is encouraged to fully normalize muscle strength and range of motion. Gradually increase the resistance of the ankle so that the patient can gradually return to normal activities. Physical exercise should only be performed when the activity and muscle tone have returned to the appropriate range. 4. Stage 4 In the second month after surgery, further rehabilitation and resumption of stopping normal physical exercise. Encourage the patient to gradually increase the resistance to exercise. If the patellofemoral joint is not infected, isometric exercise can be started. Thereafter, to maintain muscle strength, the patient can ride a bicycle, swim or walk. In conclusion, the patient still needs a follow-up of 1-6 months. Athletes with very mild preoperative atrophy can perform sports as long as there is no knee discomfort and the quadriceps muscle strength and range of motion return to normal. If the integrity of the meniscal ring is questionable, the patient should be advised not to participate in sports that require running, jumping, or joint torsion, either temporarily or permanently. Low-risk activities such as bicycling and swimming may be recommended.