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J Korean Assoc EMG Electrodiagn Med 1999;1(1):125-129.
Published online January 1, 1999.
A Variant of the Anterior In terosseous Nerve Syngrome -A case report-
Abstract
The anterior interosseous nerve (AIN) syndrome involves of the flexors pollicis longus, flexors digitorum profundus of the index and long fingers, and the pronator quadratus without cutaneous sensory deficit. Also the manifestation in the case of affecting flexors digitorum superficialis is uncommon. This paper presents a case of AIN syndrome with combind involvement of flexors digitorum superficialis muscle. We present the case of a 15-year-old man, high school student, whose chief complaint is weakness of his thumb and index finger. He has experienced difficulty in using a fork or picking up a pencil because of an inability to get a firm grip when using the thumb and index finger. Physical examination showed weakness of the flexor pollicis longus and flexor digitorum profundus to the index finger. There was no other weakness and no clinical sensory deficit. Electrodiagnostic studies revealed median motor and sensory nerve conduction studies but needle examination abnormalities noted in the flexorpollicis longus, flexor digitorum profundus, and the pronator quadratus and flexor digitorum superficialis. Anatomic variation that may cause confusion in the AIN branch to the flexor digitorum superficialis which occur in 30% of limbs. Thisanatomic possiblity to be considered by electromyographers, as this implies that 30% of the time there may be abnormalities noted in the flexor digitorum superficialis muscle in those with AIN syndrome. This presentation show a variant of AIN syndrome with involvement of flexor digitorum superficialis muslces.
Key Words: Anterior interosseous nerve syndrome, flexor digitorum superficialis


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