Anterior Interosseous Nerve Syndrome Following Shoulder Arthroscopy A Report of Three Cases

nterior interosseous nerve syndrome is a clinical en-tity characterized by pain in the proximal part of the forearm and paresis of the pronator quadratus, the flexor pollicis longus, and the radial half of the flexor digi-torum profundus. It was first described in association with brachial neuritis by Parsonage and Turner in 19481 and was later identified as a distinct entity by Kiloh and Nevin in 19522. Although anterior interosseous nerve syndrome often arises spontaneously, it has been associated with trauma and extrin-sic compression. We report the cases of three patients in whom anterior interosseous nerve syndrome developed im-mediately after ipsilateral shoulder arthroscopy. The three ar-throscopic procedures were performed by different surgeons. Two patients underwent subsequent exploration of the ante-rior interosseous nerve. All three recovered motor functio