Abstract
Anterior interosseous nerve (AION) palsy is a rare, purely motor mononeuropathy that leads to weakness of the flexor pollicis longus (FPL) and the flexor digitorum profundus (FDP) of the second digit. The typical symptoms are the inability to flex the terminal phalanges of the thumb and index finger. We described a case of anterior interosseous nerve palsy with a characteristic abnormal pinch. The duration of symptoms prior to diagnosis was five months. The conservative treatments were of four months' duration with little improvement. The lesion was identified at surgery, and the recovery was complete within one year of surgery.
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