Injury to radial nerve in lower part of spiral groove-

Radial nerve injury -        High radial nerve palsy- Injury above the spiral groove.    Paralysis of all muscles supplied by radial nerve.    Clinical features §  Wrist drop, finger drop, thumb drop §  Extension affected of- elbow, wrist, thumb and fingers §  Sensation affected of- posterior surface of arm and forearm and lower lateral half of forearm. -        Low radial nerve palsy- Injury below the spiral groove.    Type I- Injury between spiral groove and elbow. §  Elbow extensors are spared- Triceps and Anconeus. §  Wrist, thumb and finger extensors paralysed- wrist drop, thumb drop, finger drop. §  Loss of sensation on dorsal side of first web space.    Type II- Injury below the elbow joint. §  Elbow and wrist extensors spared §  Thumb and finger extensors paralysed.(extensor digitorum, extensor digiti minimi, extensor indicis, extensor pollicis longus, extensor pollicis brevis)- Thumb drop and finger drop.                                     § Loss of sensation on dorsal side of first web space.