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Quantification of hand grasp force using a pressure mapping system.

Jon W Nicholas1, Russel J Corvese, Charles Woolley

  • 1Biomedical Engineering, University of Michigan, 2200 Bonisteel Blvd., Ann Arbor, MI 48109-2099, United States. jwnich@umich.edu

Work (Reading, Mass.)
|February 10, 2012
PubMed
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This study measured hand grip forces using pressure sensors. Rheumatoid arthritis (RA) patients showed altered force distribution, potentially compensating for reduced phalange function.

Area of Science:

  • Biomechanics
  • Human Factors Engineering
  • Medical Instrumentation

Background:

  • Understanding hand function is crucial for ergonomics and rehabilitation.
  • Rheumatoid arthritis (RA) significantly impacts hand dexterity and force generation.
  • Quantifying hand forces during various tasks can reveal functional adaptations.

Purpose of the Study:

  • To investigate hand force distribution and contact area during gripping, pushing, and pulling tasks.
  • To compare hand function between healthy individuals and a subject with rheumatoid arthritis (RA).
  • To identify specific hand regions responsible for force exertion in different actions.

Main Methods:

  • Utilized a Tekscan pressure sensor wrapped around an aluminum cylinder to measure hand forces.

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  • Collected data from 10 healthy subjects and 1 subject with RA performing tasks at varying exertion levels (25%, 50%, 100% MVC).
  • Analyzed force distribution maps to identify key areas of force application.

    • Main Results:

    • A positive correlation was observed between exertion level and hand contact area.
    • The thenar region dominated force during pushing, the metacarpal joint line during pulling, and the third/fourth phalanges during gripping.
    • The RA subject exhibited increased relative thumb and distal phalange forces, suggesting compensatory strategies.

    Conclusions:

    • Hand force distribution varies significantly with task type (gripping, pushing, pulling) and exertion level.
    • Individuals with RA may compensate for impaired phalange function by increasing force contribution from other hand regions.
    • Further research with larger RA cohorts and diverse hand sizes is warranted.