Tears of the posterior horn of the meniscus generally do not heal well with conservative treatment, and aggressive surgical treatment is recommended, including meniscus repair and meniscectomy. Arthroscopic surgery to remove part of the meniscus especially the torn part of the injury. Generally after meniscus arthroscopic surgery, the knee pain, interlocking joints, and limp legs caused by the meniscus will be significantly improved. 1. Meniscus Repair: Injuries to the peripheral part of the meniscus can usually be properly repaired. Doctors can use special instruments to suture under arthroscopic guidance. 2. Meniscectomy: The indications are symptomatic meniscus injuries with abnormal movement and unrepairable sutures. Functional exercises for quadriceps and knee joint are recommended in the early stage after resection. In addition, in the acute stage, bed rest is the main focus; in the remission stage, hot compresses, physical therapy, pay attention to warmth, avoid excessive exercise and other ways to maintain. Oral medication can also be taken to promote cartilage repair, such as glucosamine. Specific treatment measures need to follow the doctor’s advice to choose.