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Anterior interosseous nerve syndrome treated with observation
82%
4003/4903
Posterior interosseous nerve syndrome with release of the Arcade of Frohse
2%
103/4903
Pronator syndrome with surgical release of the lacertus fibrosis
4%
174/4903
Anterior interosseous nerve syndrome with surgical release of Gantzer's muscle
9%
451/4903
Posterior interosseous nerve syndrome treated with observation
3%
134/4903
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This patient presents with anterior interosseous nerve (AIN) syndrome and is often seen in conjunction with brachial neuritis (Parsonage-Turner Syndrome). AIN syndrome leads to motor palsies of the flexor pollicis longus and the two radial profundus tendons leading to the clincal image shown in Figure A. The pronator quadratus is also involved and can be tested with the elbow held in a flexed position to neutralize the humeral head of the pronator teres muscle. No sensory changes occur and electromyographic (EMG) and nerveconduction (NCV)studies are often helpful in establishing the diagnosis. The Level 5 review article by Rodner et al. discusses that anterior interosseous nerve syndrome usually resolves with time, particularly if the lesion is secondary to neuritis. Observation for 3 to 6 months with splinting at 90 degrees is favored before surgical treatment. Parsonage and Turner reported in their 1948 landmark article, on several cases of isolated AIN palsy caused by neuralgic amyotrophy (ie, Parsonage-Turner syndrome [PTS] or brachial plexus neuritis). PTS symptoms may include pain and motor and/or sensory dysfunction in one or in multiple peripheral nerves of the upper extremity.
4.2
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