The anterior interosseous nerve syndrome.

A case of isolated anterior interosseous nerve palsy with its characteristic clinical picture of lack of function is described. The typical symptoms are the inability to flex the terminal phalanges of the thumb and index finger, possibly of other fingers too, and the inability to pronate the forearm when the elbow is flexed. The cases previously described in the literature are reported in comparison with the present case. Prognosis and treatment are discussed.