Radial nerve injury The radial nerve is located immediately adjacent to the humerus at the junction of the middle and lower 1/3 of the humerus, and radial nerve injury due to fracture at this location is most common. The main manifestations are wrist extension, thumb extension, finger extension, forearm rotation back disorder and skin on the back of the radial and radial 3 1/2 fingers on the dorsal side of the hand. The main area of numbness is the skin at the tiger’s mouth on the back of the hand. The typical deformity is a drooping wrist. Most of the radial nerve injuries due to humeral fractures are strains, and most of them can recover by themselves. After the fracture is repositioned and fixed, it should be observed for 2~3 months, and for those who do not recover the function in late stage, tendon transposition to reconstruct wrist extension, thumb extension and finger extension is feasible with good results.