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Screening of Axonal Degeneration in Carpal Tunnel Syndrome Using Ultrasonography and Nerve Conduction Studies

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Published on: January 11, 2019

Normative values for short-segment nerve conduction studies and ultrasonography of the ulnar nerve at the elbow

Gregor Omejec¹, Simon Podnar

¹Institute of Clinical Neurophysiology, Division of Neurology, University Medical Center, SI-1525, Ljubljana, Slovenia.

|July 3, 2014

Abstract

Introduction:

In patients with ulnar neuropathy at the elbow (UNE), short-segment nerve conduction studies (NCS) are rarely performed due to unclear reference values. We excluded controls with subclinical UNE, calculated normative values, and tested them in UNE patients.

Methods:

Clinical examination, ultrasonography (US), and 2-cm short-segment ulnar motor NCS across the elbow were performed in 49 controls and 67 UNE patients. In controls, subclinical UNE was diagnosed if at least 2 studies were outside the reference limits in the same 2-cm segment.

Results:

Exclusion of controls with subclinical UNE produced less stringent normative values (2-cm conduction velocity: 25 to 31 m/s; US cross-sectional area: 11.6 to 9.6 mm2), which raised diagnostic sensitivity (short-segment NCS: 76% to 90%; 10-cm NCS: 72% to 85%, US: 43% to 79%).

Conclusions:

We propose the use of our normative values in patients with clinically definite and probable UNE after exclusion of alternative diagnoses.

Keywords:

nerve conduction studies normative values short segment ulnar neuropathy at the elbow ultrasonography

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