Radial Mononeuropathy
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Radial neuropathies result from injury due to penetrating wounds or fractures of the arm, compression, or ischemia. Most commonly, they present with a wrist drop. The pattern of clinical involvement is dependent on the level of injury. [1]
Radial neuropathies can occur from surgical procedures such as humeral nailing performed to stabilize an acute humeral fracture. [2]
The terms Saturday night palsy and honeymooner’s palsy refer to the concept of placing one’s arm over another chair, with the resultant pressure causing injury to the radial nerve.
An introduction to radial nerve anatomy is essential for understanding the common mechanisms and location of its injury. The radial nerve branches from the posterior cord of the brachial plexus. It receives root innervation from C5-T1 spinal roots. In the upper arm, the radial nerve gives off a branch to the triceps muscle before it wraps around the humerus at the spiral groove. Three sensory branches, which supply the skin over the triceps and posterior forearm, also are given off at this level. Here, its proximity to the humerus makes it susceptible to compression and/or trauma.
After exiting the spiral groove, the radial nerve supplies the brachioradialis muscle before dividing into the posterior interosseous branch and a sensory branch. The posterior interosseous branch is a pure motor nerve that supplies the supinator. It then dives into the supinator through the fascia to supply the muscles of the wrist and finger extension. This fascia is another common site for nerve damage to occur. The sensory branch that arises approximately at the elbow travels down the forearm, becoming superficial at the wrist before it supplies the lateral aspect of the dorsum of the hand. See the image below.
United States
Radial neuropathy is the fourth most common mononeuropathy.
No racial preponderance is known.
No gender predilection has been observed.
Radial neuropathy is reported in all age groups.
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Wayne E Anderson, DO, FAHS, FAAN Assistant Professor of Internal Medicine/Neurology, College of Osteopathic Medicine of the Pacific Western University of Health Sciences; Clinical Faculty in Family Medicine, Touro University College of Osteopathic Medicine; Clinical Instructor, Departments of Neurology and Pain Management, California Pacific Medical Center
Wayne E Anderson, DO, FAHS, FAAN is a member of the following medical societies: American Academy of Neurology, American Headache Society, California Medical Association, California Neurology Society, International Headache Society, San Francisco Medical Society, San Francisco Neurological Society
Disclosure: Nothing to disclose.
Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference
Disclosure: Received salary from Medscape for employment. for: Medscape.
Neil A Busis, MD Chief of Neurology and Director of Neurodiagnostic Laboratory, UPMC Shadyside; Clinical Professor of Neurology and Director of Community Neurology, Department of Neurology, University of Pittsburgh Physicians
Neil A Busis, MD is a member of the following medical societies: American Academy of Neurology, American Association of Neuromuscular and Electrodiagnostic Medicine
Disclosure: Serve(d) as a director, officer, partner, employee, advisor, consultant or trustee for: American Academy of Neurology<br/>Serve(d) as a speaker or a member of a speakers bureau for: American Academy of Neurology<br/>Received income in an amount equal to or greater than $250 from: American Academy of Neurology.
Nicholas Lorenzo, MD, MHA, CPE Co-Founder and Former Chief Publishing Officer, eMedicine and eMedicine Health, Founding Editor-in-Chief, eMedicine Neurology; Founder and Former Chairman and CEO, Pearlsreview; Founder and CEO/CMO, PHLT Consultants; Chief Medical Officer, MeMD Inc
Nicholas Lorenzo, MD, MHA, CPE is a member of the following medical societies: Alpha Omega Alpha, American Academy of Neurology, American Association for Physician Leadership
Disclosure: Nothing to disclose.
Aashit K Shah, MD, FAAN, FANA Professor and Associate Chair of Neurology, Director, Comprehensive Epilepsy Program, Program Director, Clinical Neurophysiology Fellowship, Detroit Medical Center, Wayne State University School of Medicine
Aashit K Shah, MD, FAAN, FANA is a member of the following medical societies: American Academy of Neurology, American Clinical Neurophysiology Society, American Epilepsy Society, American Neurological Association
Disclosure: Received research grant from: Lundebck pharma.
Radial Mononeuropathy
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