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Comparing Shape Categorization to Circularity Measurement in the Evaluation of Median Nerve Compression Using Sonography
  • Published Date:
    January 08 2020
  • Source:
    J Diagn Med Sonogr. 2020
  • Language:
    English


Public Access Version Available on: January 01, 2021, 12:00 AM information icon
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Details:
  • Alternative Title:
    J Diagn Med Sonogr
  • Description:
    Purpose

    This study aimed to develop a subjective categorization of nerve shape and to examine the relationship of shape categorizations to measurement of nerve circularity.

    Methods

    Wrists were evaluated with sonography in healthy participants. Images of the median nerve were obtained in the transverse plane at the level of pisiform with the fingers resting, gripping, and pinching. Nerves were categorized as ovoid, angular, or irregular, and the cross-sectional area and perimeter were measured to calculate nerve circularity.

    Results

    Across 167 participants, the median nerve shifted from being primarily ovoid at rest to angular shaped when the fingers were in a full fist or pinching. Approximately three-quarters of subjects exhibited a shape change during dynamic movement. Irregular nerves had the lowest circularity values; however, the majority of nerves had similar circularity measures despite having different shapes.

    Conclusions

    Subjective categorization of shape has the potential to be a valid technique for evaluation of the median nerve using sonography, and this evaluation may provide additional information regarding nerve compression that is not fully captured by a circularity measure. Further investigation is needed to determine how these two techniques may be best used individually or together to advance clinical diagnosis, prevention, and rehabilitative interventions.

  • Pubmed ID:
    32064465
  • Pubmed Central ID:
    PMC7020616
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