O-shaped leg is also known as knee inversion. After knee inversion surgery, hospitalization is usually required for a period of time, such as anti-infection, wound dressing, pain relief and rehabilitation training. Knee entropion is a common limb deformity, mostly related to walking posture, standing posture, heredity, etc. Surgical treatment mainly involves osteotomy to correct knee entropion deformity. Because of the need for prophylactic antibiotics to prevent infection of the surgical opening, regular wound dressing changes to ensure cleanliness of the surgical opening, postoperative pain relief and rehabilitation training and other treatments, hospitalization for a period of time is required after the surgery. It is recommended that you consult your doctor for advice on the specifics of endonasal knee surgery and the postoperative period.