Anter Interosseous Nerve Syndrome with Pronator Teres and Flexor Carpi Radialis Muscle Atrophy - A case report -

J Korean Assoc EMG Electrodiagn Med 1999;1(1):130-133.
Published online January 1, 1999.

Abstract

The anterior interossous nerve(AIN) syndrome is characterized by functional impairment of those muscles supplied by this nerve, namely the radial aspect of the flexor digitorium profundus, flexor pollicis longus and the pronator quadratus. That is caused by various factors that induce entrapment of anterior interosseous nerve - fibrous arch of the pronator teres muscle, tendinous origin of the flexor digitorium superficialis muscle etc. A 34-year-old carpenter had experienced pain of left proximal forearm and limitation of flexor in left thumb and index finger for 3 months. Physical examination showed atrophy of forearm and limitaion of flexion of the distal phalangeal joint of the left thumb (pinch sign). Electrodiagnostic examination showed anterior interosseous syndrome. Operation finding revealed entrapment of AIN by fibrous band of the flexor digitorum superficialis muscle. We report a unusual case of anterior interosseous nerve syndrome with ptronator teres and flexor carpi radialis muscle atrophy.

Key Words: Anterior interosseous nerve syndrome, Electrodiagnosis