Injured nerve	Characteristics
Anterior interosseous	Inability to form the “OK” sign normally, with the thumb and index finger pinched together; weakened pronation
Median	Thenar eminence wasting; sensory loss to the thumb, index finger, and middle finger; benediction hand
Posterior interosseous	Inability to extend the wrist (wristdrop) without sensory loss to the dorsum of the hand
Radial	Wristdrop with sensory loss to the dorsum of the hand
Ulnar	Clawhand; motor deficits of the intrinsic muscles of the hand; first dorsal interosseous wasting; hypothenar eminence wasting