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Related Experiment Videos

A technique for needle localization in paraspinal muscles with cadaveric confirmation.

A J Haig1, M Moffroid, S Henry

  • 1Vermont Rehabilitation Engineering Center, Department of Orthopaedics and Rehabilitation, University of Vermont, Burlington.

Muscle & Nerve
|June 1, 1991
PubMed
Summary

A new technique accurately guides needles into specific multifidus muscle fascicles for electromyography (EMG). This improves EMG accuracy for diagnosing radiculopathy and aids research.

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Area of Science:

  • Anatomy
  • Neuroscience
  • Biomedical Engineering

Background:

  • Invasive electromyography (EMG) of paraspinal muscles is valuable in clinical and research settings.
  • Accurate localization of needles within specific muscle fascicles is crucial for precise EMG analysis but lacks validated techniques.
  • Segmented innervation of the multifidus muscle suggests a need for fascicle-specific localization methods to enhance radiculopathy diagnosis.

Purpose of the Study:

  • To develop and validate a novel technique for precise needle localization within specific fascicles of the multifidus, longissimus, and iliocostalis muscles.
  • To assess the accuracy of this palpation-based technique in cadavers for potential in vivo applications.
  • To determine the utility of the technique for improving electromyography (EMG) diagnosis of radiculopathy and for other applications like biopsies.

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Main Methods:

  • A palpation-based technique was developed, utilizing bony landmarks, specific needle insertion angles, and depths for muscle fascicle localization.
  • The technique's accuracy was evaluated in 13 human cadavers through 199 latex dye injections into targeted paraspinal muscle fascicles.
  • Post-injection dissection was performed to verify the accuracy of needle placement within specific fascicles of the multifidus, longissimus, and iliocostalis muscles.

Main Results:

  • The technique demonstrated high accuracy in cadaveric injections: 91/112 (81%) for multifidus fascicles, 39/43 (91%) for longissimus, and 35/44 (80%) for iliocostalis.
  • Considering potential in vivo error correction with EMG, the overall accuracy improved significantly: 97% for multifidus, 93% for longissimus, and 82% for iliocostalis.
  • Dissection revealed specific error patterns that could be mitigated by real-time EMG guidance.

Conclusions:

  • The developed palpation and angle-based technique provides accurate localization of needles within specific paraspinal muscle fascicles.
  • This technique holds significant potential for enhancing the diagnostic accuracy of EMG in identifying the root level of radiculopathy.
  • The method is also deemed useful for kinesiological studies, targeted muscle biopsies, and therapeutic injections.