Electrical impedance myography in the diagnosis of radiculopathy

Andrew J. Spieker, Pushpa Narayanaswami, Laura Fleming, John C. Keel, Stefan C. Muzin, Seward B. Rutkove

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Introduction: We sought to determine whether electrical impedance myography (EIM) could serve as a diagnostic procedure for evaluation of radiculopathy. Methods: Twenty-seven patients with clinically and radiologically diagnosed cervical or lumbosacral radiculopathy who met a "gold standard" definition underwent EIM and standard needle electromyography (EMG) of multiple upper or lower extremity muscles. Results: EIM reactance values revealed consistent reductions in the radiculopathy-affected myotomal muscles as compared with those on the unaffected side; the degree of asymmetry was associated strongly with the degree of EMG abnormality (P<0.001). EIM had a sensitivity of 64.5% and a specificity of 77.0%; in comparison, EMG had a sensitivity of 79.7% but a specificity of 69.7%. Conclusions: These findings support the potential for EIM to serve as a new non-invasive tool to assist in diagnosis of radiculopathy; however, further refinement of the technique is needed for this specific application.

Original languageEnglish (US)
Pages (from-to)800-805
Number of pages6
JournalMuscle and Nerve
Issue number5
StatePublished - Nov 2013
Externally publishedYes


  • Cervical radiculopathy
  • Electrical impedance
  • Electromyography
  • Lumbosacral radiculopathy
  • Muscle
  • Reactance

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)


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