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Related Experiment Videos

Nerve conduction topography in geriatric hand assessment.

Mohammed Ferdjallah1, Jacqueline J Wertsch, Mohammad A Ahad

  • 1Department of Electrical and Computer Engineering, University of Tennessee, Knoxville, TN, USA.

Journal of Rehabilitation Research and Development
|May 9, 2006
PubMed
Summary

Multi-site motor nerve conduction studies reveal differences in thumb muscle electrical activity, especially in elderly individuals with thumb carpometacarpal degenerative joint disease. This suggests single-site recordings may be misleading for accurate diagnosis.

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Area of Science:

  • Neurology
  • Biomedical Engineering
  • Anatomy

Background:

  • Motor nerve conduction studies (NCS) diagnose nerve disorders like carpal tunnel syndrome.
  • Current NCS use single-site recordings, potentially overlooking contributions from adjacent muscles.
  • Thumb carpometacarpal (CMC) degenerative joint disease (DJD) may alter thenar muscle anatomy and electrical activity.

Purpose of the Study:

  • To investigate the impact of thumb CMC DJD on median nerve motor conduction topography.
  • To compare multi-site recording with traditional single-site recording in thenar muscles.

Main Methods:

  • 15-site recordings over the thenar eminence during median nerve motor NCS.
  • Subjects included 12 young adults (normal anatomy) and 25 elderly adults (thumb CMC DJD).

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  • Analysis focused on compound muscle action potential (CMAP) amplitudes and latencies.

    • Main Results:

    • Maximum CMAP values occurred at different electrode positions between the young and elderly groups.
    • Single-site recordings underestimated CMAP amplitudes and overestimated latencies in the elderly group.
    • Multi-site recordings provided a more accurate topographic representation of nerve conduction.

    Conclusions:

    • Single-site NCS may be misleading for evaluating median nerve conduction in conditions like thumb CMC DJD.
    • Multi-site recording and nerve conduction topography mapping offer a more comprehensive assessment.
    • Further research into multichannel grid electrodes for CMAP analysis is warranted.