Motor Unit Number Index in Evaluating Patients with Lumbar Spinal Stenosis.

Abstract:

OBJECTIVE:Motor Unit Number Index (MUNIX) is a quantitative electrophysiological measure that provides an index of the number of motor neurons supplying a muscle. The aim of this exploratory study is to assess the utility of MUNIX in the evaluation of patients with lumbar spinal stenosis (LSS). DESIGN:Participants were assigned to three groups: clinical and radiological lumbar stenosis (LSS with neurogenic intermittent claudication [NIC])-group A, radiological LSS without NIC-group B, and a control group - group C. Each patient self-rated their pain and functional disability using the numerical rating scale (NRS) and a series of functional questionnaires. An electromyographer performed nerve conduction tests, electromyography, and MUNIX testing. RESULTS:17 patients completed the study. There were 9, 5, and 3 patients in groups A, B & C respectively. There were no discernable differences in MUNIX values of any individual muscle or combined MUNIX score between the three groups. MUNIX values did not correlate to pain/functional measures. CONCLUSION:In this exploratory study, MUNIX did not demonstrate discriminatory ability between patients with LSS and was not correlated with pain and functional measures. Further study is needed to explore MUNIX's role in longitudinal evaluation of patients with the clinical syndrome of LSS.

journal_name

Am J Phys Med Rehabil

authors

Cai H,Kroll M,Annaswamy T

doi

10.1097/PHM.0000000000001681

subject

Has Abstract

pub_date

2021-01-08 00:00:00

eissn

0894-9115

issn

1537-7385

pii

00002060-900000000-97780

journal_volume

Publish Ahead of Print

pub_type

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