Anterior Interosseous Nerve Syndrome

Lesion of the interosseous anterior nerve, which is the largest branch of the median nerve in the forearm, is very rare and often occurs due to compression of nerves between the two heads of the pronator teres muscle, following a trauma or idiopathically. We present a 45-year-old patient who developed pain in his right forearm, hand muscle weakness and hyperextension of the thumb and forefinger after physical work (he had carried heavy boxes on his forearms). The diagnosis of compressive neuropathy was based on electromyoneurographic examination. The patient underwent physical therapy and after 3 months his clinical and electrophysiological findings were improved.