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An electromechanical testing device for assessment of hand motor function

G J Byers1, B S Goldstein, J E Sanders

  • 1Department of Mechanical Engineering, University of Washington, Seattle 98195, USA.

IEEE Transactions on Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
|April 16, 1998
PubMed
Summary

Weak spinal cord injury (SCI) patients show reduced finger pinching force and slower finger movement speed. This new instrument can help track hand motor dysfunction progression in SCI.

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Area of Science:

  • Rehabilitation engineering
  • Neuroscience
  • Biomechanics

Background:

  • Intrinsic hand muscles are crucial for fine motor skills.
  • Spinal cord injury (SCI) often impairs hand function.
  • Quantitative assessment tools are needed to evaluate hand motor deficits in SCI.

Purpose of the Study:

  • To develop and validate an instrument for measuring intrinsic hand muscle strength and function.
  • To compare hand function between individuals with weak SCI, non-weak SCI, and healthy controls.

Main Methods:

  • Designed and constructed a novel instrument using strain gauges and a microprocessor.
  • Assessed maximum pinching force and rapid alternating movement speed of the index finger.
  • Recruited participants: 4 weak SCI, 3 non-weak SCI, and 21 control subjects.

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Main Results:

  • A trend of reduced maximum pinching force was observed in weak SCI subjects.
  • Weak SCI subjects exhibited significantly slower rapid alternating movement speed of the index finger.
  • The instrument demonstrated sensitivity to functional differences between groups.

Conclusions:

  • The developed instrumentation effectively assesses intrinsic hand muscle function.
  • Findings suggest significant hand motor deficits in weak SCI patients.
  • The instrument shows potential as a clinical tool for monitoring SCI-related hand dysfunction progression.