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NEUROLOGY 2008;70:e9-e13
© 2008 American Academy of Neurology
Resident and Fellow Section

Pearls & Oy-sters: False positives in short-segment nerve conduction studies due to ulnar nerve dislocation

B. J. Kim, MD, PhD, S. B. Koh, MD, PhD, K. W. Park, MD, PhD, S. J. Kim, MD, PhD and J. S. Yoon, MD, PhD

From the Departments of Neurology (B.J.K., S.B.K., K.W.P.) and Rehabilitation Medicine (S.J.K., J.S.Y.), College of Medicine, Korea University, Seoul.

Address correspondence and reprint requests to Dr. Joon Shik Yoon, Department of Rehabilitation Medicine, Korea University Guro Hospital, Korea University College of Medicine, 80, Guro-dong, Guro-gu, Seoul, 152-703, Korea rehab46{at}korea.ac.kr.

The possibility that a technical error may occur during nerve conduction studies due to ulnar nerve dislocation when the elbow is flexed has recently been suggested. We investigated normal volunteers using ultrasonography to observe the effects of ulnar nerve dislocation during elbow flexion on short-segment nerve conduction studies. We found significant conduction block in all of the subjects with ulnar nerve dislocation, and the finding was defined as a technical error caused by volume conduction. The results of the present study suggest that caution should be exercised when interpreting the results of short-segment nerve conduction studies at the across-elbow segment due to the possibility of technical error induced by ulnar nerve dislocation.

Abbreviations: NCS = nerve conduction study; S-NCS = short-segment NCS; UNE = ulnar neuropathy at the elbow.

Disclosure: The authors report no conflicts of interest.






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