Pain and the pronator teres syndrome.

Extremely painful paresthesias and mild motor weakness of the hand were relieved by sectioning the deep head of the pronator teres muscle and the fibrous arch of the flexor digitorum superficialis, thereby freeing the median nerve and its anterior interosseous branch. The characteristic pinch deformity of the thumb and index fingers usually described in anterior interosseous-nerve syndrome was not present. A Tinel sign at the level of the pronator teres was present.