A fracture of the arm caused during a fight is usually an ulnar radius fracture. If an ulnar radius fracture occurs, the determination of whether it is a minor injury depends on the age of the patient and the extent of the fracture. 1. If the ulnar radius fracture occurs in a child and is a green branch fracture, i.e., the fracture is not displaced, the fracture is a minor injury and can be treated conservatively. If the ulnar radius fracture occurs in an adult and the fracture is displaced, and the superficial branch of the radial nerve is injured, the patient has a wrist drop and thumb dorsiflexion restriction, which is a more serious injury and requires immediate surgery. Nerve exploration surgery. Therefore, after the ulnar radius fracture occurs, the patient needs to go to the hospital immediately to take X-rays, and according to the results of the film and after the diagnosis of the physician, then give the corresponding treatment, so as not to delay the condition.