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, Generally speaking, conservative treatment is not recommended for meniscal injuries, for the reasons stated above. There are some patients who can try: 1. The 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 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, the original injury may be aggravated and surgery has to be considered, and the chances of surgical meniscus suture are low at this time. 2. Older patients, whose tears are generally degenerative, such patients Patients whose cartilage has generally worn down very badly, meniscus surgery is of little significance to the cartilage, and topical medication or oral painkillers can be used. For patients with severe symptoms or interlocking, arthroscopic surgery can be considered, and those with severe cartilage degeneration should undergo joint replacement surgery. 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 likelihood of total excision; if surgery is performed as soon as possible, generally only the torn flap can be removed, and the remaining good meniscal 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 conclusion, the sooner arthroscopic surgery is performed on non-elderly patients with meniscal injuries, the better!