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Ulnar nerve instability in the cubital tunnel of asymptomatic volunteers

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Abstract

Purpose

Ulnar nerve instability (UNI) in the cubital tunnel is defined as ulnar nerve subluxation or dislocation. It is a common disorder that may be noted in patients with neuropathy or in the asymptomatic. Our prospective, single-site study utilized high-resolution ultrasonography (US) to evaluate the ulnar nerve for cross-sectional area (CSA) and measures of shear-wave elastography (SWE). Mechanical algometry was obtained from the ulnar nerve in the cubital tunnel to assess pressure pain threshold (PPT).

Methods

Forty-two asymptomatic subjects (n = 84 elbows) (25 males, 17 females) aged 22–40 were evaluated. Two chiropractic radiologists, both with 4 years of ultrasound experience performed the evaluation. Ulnar nerves in the cubital tunnel were sampled bilaterally in three different elbow positions utilizing US, SWE, and algometry. Descriptive statistics, two-way ANOVA, and rater reliability were utilized for data analysis with p ≤ 0.05.

Results

Fifty-six percent of our subjects demonstrated UNI. There was a significant increase in CSA in subjects with UNI (subluxation: 0.066 mm2 ± 0.024, p = 0.027; dislocation: 0.067 mm2 ± 0.024, p = 0.003) compared to controls (0.057 mm2 ± 0.017) in all three elbow positions. There were no significant group differences in SWE or algometry. Inter- and intra-observer agreements for CSA of the ulnar nerves within the cubital tunnel were assessed using intraclass correlation coefficient (ICC) and demonstrated moderate (ICC 0.54) and excellent (ICC 0.94) reliability.

Conclusions

Most of the asymptomatic volunteers demonstrated UNI. There was a significant increase in CSA associated with UNI implicating it as a risk factor for ulnar neuropathy in the cubital tunnel. There were no significant changes in ulnar nerve SWE and PPT. Intra-rater agreement was excellent for the CSA assessment of the ulnar nerve in the cubital tunnel. High-resolution US could be utilized to assess UNI and monitor for progression to ulnar neuropathy.

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Authors and Affiliations

  1. Department of Radiology, Logan University, 1851 Schoettler Rd, Chesterfield, MO, 63017, USA

    Stacey M. Cornelson, Roberta Sclocco & Norman W. Kettner

  2. Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA

    Roberta Sclocco

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  1. Stacey M. Cornelson
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Cornelson, S.M., Sclocco, R. & Kettner, N.W. Ulnar nerve instability in the cubital tunnel of asymptomatic volunteers. J Ultrasound 22, 337–344 (2019). https://doi.org/10.1007/s40477-019-00370-9

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