What is the hand shape of radial nerve injury. First, the radial nerve is in the middle and lower 1/3 of the humerus close to the backbone, the radial nerve is easily damaged during this humeral fracture, excessive skeletal growth and anterior dislocation of the radial head can also compress the radial nerve, and surgical inadvertence can also damage this nerve. There is an area of skin sensory loss on the radial side of the dorsum of the hand, but because of the re-growth relationship of the adjacent nerve, the sensory loss is often not obvious or only hyperalgesia. Second, after the radial nerve is severed, the wrist joint cannot be dorsally extended, resulting in downward drooping, the metacarpophalangeal joint cannot be straightened, and the thumb cannot be dorsally extended and radially abducted. Thirdly, if the radial nerve is severed at the anterior wall, clinically it does not appear downward, its symptoms are mainly the inability of the metacarpophalangeal joint to dorsally extend, the inability of the thumb to dorsally extend and radially abduct. Injury at this site is most commonly associated with radial head resection, direct trauma to the radial head or fracture of the radial neck and posterior rotator muscle compression. Humeral disease and type of fracture complicating radial nerve injury, most of which are nerve contusions, less often ruptures, can generally be treated conservatively first, mainly with methylcobalamin capsules, vitamin B class, injectable rat nerve growth factor, and surgical exploration after 3 months of ineffectiveness.