Posterior Interosseous Neuropathy: Electrodiagnostic Evaluation

Anna-Christina Bevelaqua, MD
Department of Physical Medicine and Rehabilitation, NewYork-Presbyterian Hospital

Catherine L. Hayter, MBBS
Hospital for Special Surgery


Joseph H. Feinberg, MD

Physiatrist-in-Chief, Hospital for Special Surgery
Co-Medical Director, Center for Brachial Plexus and Traumatic Nerve Injury
Associate Professor of Rehabilitation Medicine, Weill Cornell Medical College

Scott A. Rodeo, MD

Attending Orthopaedic Surgeon, Hospital for Special Surgery
Professor of Orthopaedic Surgery, Weill Cornell Medical College

Abstract

Electrodiagnostic studies are used to anatomically localize nerve injuries. These tests help differentiate between cervical radiculopathies, brachial plexopathies, and peripheral nerve injuries. They also help to identify or rule out other underlying neurological diseases and disorders. In this case report, a 22-year-old male swimmer presented with left finger extensor weakness following pull-up exercises. Left wrist extension remained intact. Electrodiagnostic testing revealed a severe but incomplete posterior interosseous neuropathy. Magnetic resonance imaging confirmed inflammation of the nerve in the forearm. Posterior interosseous neuropathy is an uncommon but well-studied condition. Typically, this condition presents with weakness in finger and thumb extension with preserved wrist extension as the extensor carpi radialis longus is innervated proximal to the site of nerve compression in most cases. It is important to understand the anatomic course and distribution of the radial nerve in order to make an accurate diagnosis. Once the anatomy is understood, electrodiagnostic testing may be used to identify the location of nerve injury and exclude other disorders.

This article appears in HSS Journal: Volume 8, Number 2.
View the full article at springerlink.com.

About the HSS Journal

HSS Journal, an academic peer-reviewed journal published three times a year, February, July and October. The Journal accepts and publishes peer reviewed articles from around the world that contribute to the advancement of the knowledge of musculoskeletal diseases and disorders.


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