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Posterior interosseous nerve (PIN) palsy has been recognised at least since 1905 when Guillain and Courtellemont described a case in an orchestral conductor. In 1899 Gowers described involvement of the muscles of the forearm in radial nerve palsy but did not specifically note damage to its important branch, the PIN. During the first world war Tinel described the anatomy without mentioning the nerve by name and without discussion of causation. By the end of the second world war the PIN had been so named.1
The PIN consists of one bundle of motor nerve fibres at the arcade of Fröhse (the supinator arch ) but divides into two bundles near its point of exit from the supinator muscle. The recurrent superficial motor branch innervates the extensor digitorum, extensor digiti minimi, and extensor carpi ulnaris; the descending or deep motor branch innervates the abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, and extensor indicis.2
The syndrome is also known as the …