Surgery for meniscus injury grade 3 requires a hospital stay of 5 to 7 days. Meniscus injury grade 3 belongs to meniscus tear, for more serious meniscus injury, need to carry out surgical treatment, clinical usually use arthroscopic meniscus injury site suture or resection. Preoperative systematic examination is required to exclude preoperative contraindications, and the surgery can be performed on the second day after hospitalization. After surgery, dressing change, anti-infection treatment, and guidance for rehabilitation are also needed, requiring a total hospitalization of about 5 to 7 days. If the patient is in good condition, the surgical site is not infected, and the knee joint recovers well after review, the patient can be discharged earlier. If the postoperative wound becomes infected, the patient will also need to undergo anti-infection treatment in the hospital, extending the hospitalization time. Specific patient’s hospitalization time is recommended to be determined with the supervising physician to understand his/her condition and the content of the treatment needed.