Posterior Interosseous Neuropathy Caused by Torsion due to Leash of Henry: A Case Report

doi:2019.21.1.32

J Electrodiagn Neuromuscul Dis > Volume 21(1); 2019 > Article

Case Report

J Korean Assoc EMG Electrodiagn Med 2019;21(1):32-36.
DOI: https://doi.org/10.18214/jkaem.2019.21.1.32 Published online June 30, 2019.

Posterior Interosseous Neuropathy Caused by Torsion due to Leash of Henry: A Case Report

Received: 6 March 2019 • Revised: 17 April 2019 • Accepted: 10 May 2019

Abstract

A 34-year-old man was referred for electrodiagnosis of left forearm and elbow pain with concurrent left wrist and finger extension weakness. Symptom developed abruptly, after waking up from sleep. After 11 days of onset, electromyography was performed. In nerve conduction study, the left radial motor response was unobtainable and in needle electromyography, abnormal spontaneous activities and no motor unit potential were noted in the left supinator, extensor digitorum communis, extensor carpi ulnaris and extensor indicis proprius muscles, suggesting left posterior interosseous neuropathy involving the supinator muscle and all the distal muscles to it. Subsequent ultrasonography of the left upper arm revealed multiple nerve torsions, and surgical exploration finally confirmed that the main torsion site was caused by the recurrent branch of radial artery, the Leash of Henry. We report an unusual case of spontaneous posterior interosseous nerve neuropathy due to nerve torsion caused by Leash of Henry.

Key Words: posterior interosseous nerve syndrome, electrodiagnosis, nerve compression syndromes