A neglected case of rare palsy of the descending branch of the posterior interosseous nerve due to penetrating injury.

摘要

Traumatic palsy of the descending branch of the posterior interosseous nerve (PIN) is rare. Traumatic palsy usually involves the entire PIN around the elbow, leading to finger drop with loss of extension of all fingers and thumb. In the literature, to the best of our knowledge, only one case of traumatic palsy of the descending branch of the PIN due to penetrating injury is reported [1]. We report a neglected, rare case with complete loss of thumb extension and weakness in index finger extension following penetrating injury to the forearm. Our report shows that to diagnose the lesion site in partial PIN palsy, detailed knowledge of the PIN branching pattern is necessary.