What is Anterior Interosseous Syndrome?

Anterior Interosseous Syndrome is a condition where there has been compression of the anterior interosseous nerve, a motor branch of the median nerve. Compression may occur either at the flexor digitorum superficialis muscle or deep head of the pronator teres muscle (muscles of the forearm). As the anterior interosseous nerve is a motor nerve responsible for certain movements the symptoms include weakness and reduced range of motion of the thumb, index and middle fingers, and may be accompanied by pain in the upper forearm and elbow.

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