A good meniscus can play an important role in protecting knee cartilage and maintaining knee motion; however, if the meniscus is damaged, it is like a rusted or broken ball in a bearing, and the torn pieces can cause wear and tear of the articular cartilage and aggravate cartilage damage. In some patients, the abnormal position of the meniscus tear can lead to limited extension or flexion of the knee joint, which can only be restored by surgical correction of the tear or removal of the tear. Therefore, for meniscal tears, nothing is better than nothing. The location of the torn flap and whether it can be sutured can be initially determined by MRI. 2, in general, meniscal injury is not recommended for conservative treatment, for the reasons stated above. There are some patients can try: (1) symptoms are not heavy, only mild pain patients. Such patients are generally more stable at the meniscus tear, the tear does not exceed 1cm, will not be stuck in the joint cartilage, the tear flap will not be displaced in daily life. However, this conservative treatment is at the cost of giving up normal knee movement function, i.e., the patient cannot play normal sports and can only maintain daily life, and if there is a sprain or an emergency while walking, etc., the original injury may be aggravated and surgery has to be considered, and the chances of surgical meniscus suturing again at this time are not good. (2) Older patients, whose tears are generally degenerative, the cartilage of such patients is generally worn very badly, and meniscus surgery is not significant for the cartilage, and topical medication or oral painkillers can be used. Arthroscopic surgery can be considered for those with severe symptoms or interlocking, and arthroplasty surgery should be performed for those with severe cartilage degeneration. 3, therefore, non-elderly patients, meniscus injury once diagnosed, that is, as soon as possible surgical treatment. Arthroscopic meniscus surgery can be divided into 3 categories: total excision, partial excision and meniscus suture (i.e. meniscus repair surgery). The first two techniques are closely related to the duration of the meniscus injury. The longer the meniscus injury, the more severe the injury may be and the greater the possibility of total excision; if surgery is performed as soon as possible, generally only the torn flap can be removed and the remaining good meniscus tissue can be preserved to be able to perform some or even all of the meniscus functions. Meniscal suture surgery is indicated for fresher longitudinal tears, which is a poorly understood medical anatomical term and generally requires an arthroscopic determination. In short, the sooner arthroscopic surgery is performed on non-elderly patients with meniscus injuries, the better! 4. Arthroscopic meniscus surgery has advantages! First, it is minimally invasive, the surgery only requires 3 eyes of less than 1cm. Second, the postoperative recovery is fast, as long as the cartilage condition is good, non-sutured patients can return to the amount of movement required for daily life in 2-3 weeks after surgery. In addition, it should be noted that the cost of arthroscopic meniscus surgery in our clinic is usually around 8,000, and you can take medical insurance. The hospital stay is 2-3 days. 5. Theoretically, the removal of most or all of the meniscus can cause premature degeneration of the knee joint. However, a broken meniscus left in the joint can cause far more serious problems than no meniscus at all (imagine a bearing without a steel ball in it running and a running bearing with a broken steel ball in it). In reality, the degeneration of the knee joint after meniscectomy is not as severe as the theory suggests, and many athletes who have had their meniscectomy not only return to competition, but regain their gold medals! After meniscectomy, it is especially important to strengthen the knee musculature to restore function and protect the knee cartilage. This is fully explained and emphasized in our rehabilitation program, and can be followed by the patient concerned after surgery.