Typically, ulna fracture splints take 4 to 8 weeks to remove. The time of splint removal should be determined by the time of scab formation. A fracture of the ulna refers to a disruption of the continuity and integrity of the ulna bone, and occurs most often as a result of a violent blow from an external force acting directly on the ulna, or as a result of an indirect violent twisting that causes the bone to break. The first stage of fracture healing is the hematoma-inflammatory mechanization phase, in which a fibrous connection is formed in about 2 weeks, but at this time the connection is not secure. The second stage of fracture healing is the period of primitive scab formation, which takes about 12 weeks, at which point clinical healing of the fracture is gradually achieved. Splint removal for ulna fractures should be performed during this period so as not to interfere with early functional training of the ulna. Generally, it takes 4-8 weeks to remove the splint of ulna fracture. Splint removal time should be determined according to the time of scab formation. It is important to note that X-rays must be taken before removing the ulna splint, and if the bone scab has completely grown out, the splint can be removed as appropriate according to the doctor’s instructions.