The need for surgery for a slightly displaced ulna break depends on the degree of injury, the location of the fracture, and other factors, and cannot be generalized. Generally, undisplaced or slightly displaced ulna does not require surgery and can be recovered through conservative treatment. However, if there is a comminuted fracture of the broken end of the ulna, surgery is required. If the fracture of the ulna is mild and there is no obvious displacement of the broken end, it can be treated conservatively with manipulation of the fracture and fixation with plaster casts, but it needs to be reviewed regularly to keep observing the displacement of the fracture and the healing process. If the ulna fracture is serious, the fracture end has comminuted fracture, this situation needs to be treated surgically, usually take the method of incision and reduction plate internal fixation for treatment. After treatment, patients with ulna fracture need to go to the hospital regularly for X-ray review to observe the healing of the ulna fracture and follow the doctor’s instructions to carry out rehabilitation training to promote the recovery of the condition. The affected limb should wait until the fracture line has completely disappeared before weight-bearing activities can be carried out gradually, and if other discomforts occur during the recovery period, the doctor should be informed in time.