Wraparound injury of posterior interosseous nerve on the unreduced radial head: a case report.

Injury in radial nerve, especially its deep branch, posterior interosseous nerve (PION), is the most common nerve complication associated with Monteggia fracture. According to the reports by Boyd and Spinner, 100% of these injuries recovered spontaneously. Permanent or chronic radial nerve palsy caused by an unreduced radial head is very rare; the optimal treatment is still uncertain. Here a case of chronic PION injury in Monteggia fracture with unreduced radial head is reported.