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Clinical Assessment of the Ulnar Nerve at the Elbow: Reliability of Instability Testing and the Association of Hypermobility with Clinical Symptoms
Ryan P. Calfee, MD1; Paul R. Manske, MD1; Richard H. Gelberman, MD1; Marlo O. Van Steyn, MD1; Jennifer Steffen, BS1; Charles A. Goldfarb, MD1
1 Department of Orthopaedic Surgery, Washington University School of Medicine at Barnes-Jewish Hospital, 660 South Euclid Avenue, St. Louis, MO 63110. E-mail address for R.P. Calfee: calfeer@wudosis.wustl.edu
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Disclosure: In support of their research for or preparation of this work, one or more of the authors received, in any one year, outside funding or grants of less than $10,000 from a grant (UL1 RR024992) from the National Center for Research Resources, a component of the National Institutes of Health (NIH), and the NIH Roadmap for Medical Research, for statistical support. Neither they nor a member of their immediate families received payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity.

Investigation performed at the Department of Orthopaedic Surgery, Washington University School of Medicine at Barnes-Jewish Hospital, St. Louis, Missouri
Disclaimer: The contents of the article are solely the responsibility of the authors and do not necessarily represent the official view of the National Center for Research Resources or the National Institutes of Health.

Copyright © 2010 by The Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2010 Dec 01;92(17):2801-2808. doi: 10.2106/JBJS.J.00097
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Abstract

Background: 

Ulnar nerve hypermobility has been reported to be present in 2% to 47% of asymptomatic individuals. To our knowledge, the physical examination technique for diagnosing ulnar nerve hypermobility has not been standardized. This study was designed to quantify the interobserver reliability of the physical examination for ulnar nerve hypermobility and to determine whether ulnar nerve hypermobility is associated with clinical symptoms.

Methods: 

Four hundred elbows in 200 volunteer participants were examined. Each participant was queried regarding symptoms attributable to the ulnar nerve. Three examiners, unaware of reported symptoms, independently performed a standardized examination of both elbows to assess ulnar nerve hypermobility. Ulnar nerves were categorized as stable or as hypermobile, which was further subclassified as perchable, perching, or dislocating. Provocative maneuvers, consisting of the Tinel test and flexion compression testing, were performed, and structural measurements were recorded. Kappa values quantified the examination's interobserver reliability. Unpaired t tests, chi-square tests, Wilcoxon tests, and Fisher exact tests were utilized to compare data between those with hypermobile nerves and those with stable nerves.

Results: 

Ulnar nerve hypermobility was identified in 37% (148) of the 400 elbows. Hypermobility was bilateral in 30% (fifty-nine) of the 200 subjects. For the three examiners, weighted kappa values on the right and left sides were 0.70 and 0.74, respectively. Elbows with nerve hypermobility did not experience a higher prevalence of subjective symptoms (snapping, pain, and tingling) than did elbows with stable nerves. Provocative physical examination testing for ulnar nerve irritability, however, showed consistent trends toward heightened irritability in hypermobile nerves (p = 0.04 to 0.16). Demographic data and anatomic measurements were similar between the subjects with stable nerves and those with hypermobile nerves.

Conclusions: 

Ulnar nerve hypermobility occurs in over one-third of the adult population. Utilizing a standardized physical examination, a diagnosis of ulnar nerve hypermobility can be established with substantial interobserver reliability. In the general population, ulnar nerve hypermobility does not appear to be associated with an increased symptomatology attributable to the ulnar nerve.

Clinical Relevance: 

The results of this study demonstrate the reliability of clinically diagnosing ulnar nerve hypermobility and the lack of association of ulnar nerve hypermobility with symptoms.

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    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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