It is recommended to wear a brace for about 3 months after osteotomy for ulnar impingement syndrome, but the postoperative recovery time varies from patient to patient and needs to be determined according to the postoperative review. In ulnar impingement syndrome, the ulnar head and ulnar styloid impinge on the lunate and triquetrum for a long period of time, and the compression leads to ischemic necrosis of the ulnar side of the lunate, and the compression of the ulnar styloid can also cause ischemic necrosis of the triquetrum. Osteotomy is required after ulnar impingement syndrome leading to osteonecrosis to amputate the necrotic bone and improve the function of the wrist joint. After surgery, the joint should be braced with a plaster or a brace. It is generally recommended that the joint be braced for about three months, and the brace should be removed after the osteotomy site has formed a scab and healed. The recovery time after osteotomy varies depending on the patient’s condition. Regular follow-up X-rays are needed to assess the healing of the bone at the surgical site and to choose the right time to remove the brace. If the bone is not healing well, the removal of the brace may be delayed. After ulnar impingement syndrome surgery, patients should go to the hospital for review if they feel unwell, and it is recommended to consult a specialist for how long the brace should be worn.