Partial Paralysis of Posterior Interosseous Nerve: Case Report

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TURKIYE KLINIKLERI TIP BILIMLERI DERGISI, vol.32, no.3, pp.874-877, 2012 (SCI-Expanded) identifier identifier


The posterior interosseous nerve (PIN) is a branch of the radial nerve and has motor function only. PIN divides into two main branches, recurrent and descending branches. The recurrent branch innervates extensor digitorum communis (EDC), extensor carpi ulnaris (ECU), and extensor digiti minimi (EDM) muscles. Here, we report a 45-year-old male patient presenting with paralysis of recurrent branch of PIN developing secondary to prolonged muscle edema. He had a history of numbness of the right hand fingers after painting and extension loss a day after. He was first seen 9 months after the onset. Physical exam revealed loss of active extension of the 3rd, 4th and 5th fingers at the metacarpophalangeal joint level; the extension of the 1st and 2nd finger was preserved. Tendon transfer of flexor carpi radialis to 3rd, 4th, 5th EDC tendons was performed. Third month postoperatively, complete extension of the V, 4th and 5th fingers was achieved. This case was thought to contribute to a better understanding of the functional anatomy of the radial nerve.