Turkish Neurosurgery
Posterior Interosseous Nerve Injury after a Both Bone Fracture of Forearm: A case report
Shilu Shrestha2, Vojtech Kunc1, AC Woo4
12. lekarska fakulta Univerzity Karlovy, Ustav anatomie, Prague,
2National Trauma Center, Department of Orthopedics and Trauma, Kathmandu,
3Masaryk Hospital, Clinic of Traumatology, Usti nad Labem,
4Tan Tock Seng Hospital, Department of General Surgery, Singapore,
DOI: 10.5137/1019-5149.JTN.32693-20.1

Aim: Posterior interosseous nerve is in close proximity to the bone at radial side of the proximal forearm. It is therefore vulnerable during the trauma or surgical exposure of proximal forearm. However, there are only limited studies reporting such injuries. There are sparse reports on isolated injury to the posterior interosseous nerve in proximal forearm fractures but isolated injury to the branch of posterior interosseous nerve has not been described before. Case report: We report a case of 27 years old man presenting with an inability to extend the ulnar three fingers of his left hand after sustaining closed fractures of the left ulna and radius in a motorbike accident. The patient recovered partially over the course of 3 months but continues to be functionally compromised by the persistent radial deviation of his left wrist and incomplete mobility of the ulnar 3 fingers upon extension. On second exploration, we found the denervated muscles supplied by the recurrent branch of posterior interosseous nerve. Tendon transfer was performed with good clinical outcome at 12 months Conclusion: This is a rare case of isolated injury to branch of posterior interosseous nerve. This generates the suspicion of possibility of PIN or its branch injury even in closed fracture of forearm. And importance of interval generation during the fracture fixation to prevent the possibility of iatrogenic injury to branches of PIN.

Corresponding author : Shilu Shrestha