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Updated: Aug 5, 2026
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Measuring Neuromuscular Junction Functionality
Published on: August 6, 2017
Exploring the Value of Quantitative Muscle Ultrasound in Neuromuscular Junction Disorders: A Pilot Study
Artor Pogosean1,2, Maarika Liik2, Nens van Alfen3
1Department of Medical Sciences, Clinical Neurophysiology, Uppsala University, Uppsala, Sweden.
Muscle & Nerve
|July 30, 2026
Summary
Quantitative muscle ultrasound (QMUS) showed limited sensitivity for detecting muscle changes in neuromuscular junction disorders. While some patients had abnormal QMUS, electrodiagnostic testing remains more sensitive for these conditions.
Area of Science:
- Neurology
- Diagnostic Imaging
- Muscle Physiology
Background:
- Quantitative muscle ultrasound (QMUS) is established for muscle pathology assessment.
- Its utility in neuromuscular junction (NMJ) disorders is not well-defined.
Purpose of the Study:
- To investigate the association between QMUS and structural muscle changes in patients with NMJ disorders.
- To explore QMUS as a potential diagnostic tool for NMJ conditions.
Main Methods:
- Retrospective analysis of 18 patients with confirmed NMJ disorders.
- Combined electrodiagnostic testing (EDx) and QMUS.
- Categorization of QMUS scores based on muscle echogenicity z-scores.
Main Results:
- 72% of patients exhibited abnormal EDx findings.
- QMUS showed normal echogenicity in 78% of patients.
- Abnormal or borderline QMUS was observed in 22%, correlating with abnormal EDx.
Conclusions:
- Structural muscle changes may be present in a subset of NMJ disorder patients.
- QMUS demonstrates lower sensitivity than EDx for these conditions.
- Further research with standardized protocols is needed to assess QMUS's complementary role.
