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Measurement of Spatial Stability in Precision Grip
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Published on: June 4, 2020

Altered digit force direction during pinch grip following stroke.

Na Jin Seo1, William Z Rymer, Derek G Kamper

  • 1Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Chicago, IL, USA. seon@uwm.edu

Experimental Brain Research
|February 27, 2010
PubMed
Summary

Stroke survivors with hemiparesis show significant grip force deviation in affected hands, leading to object slippage. Targeted therapies focusing on force direction may improve grasping ability.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Rehabilitation Science

Background:

  • Unilateral stroke often results in hemiparesis, affecting hand function and grip.
  • Impaired grip force control is a common challenge for stroke survivors, impacting daily activities.
  • Understanding the biomechanics of grip in hemiparetic hands is crucial for developing effective therapies.

Purpose of the Study:

  • To investigate grip force development and direction in individuals with hemiparesis after stroke.
  • To compare force production and deviation in paretic versus non-paretic digits.
  • To identify factors associated with altered grip force direction in stroke survivors.

Main Methods:

  • Eleven chronic stroke patients with severe hand impairment and five controls grasped an instrumented object.
  • Fingertip forces, digit posture, and muscle electromyography were recorded under various grip conditions.
  • Regression analysis examined associations between force direction, muscle activation, and digit posture.

Main Results:

  • Paretic digits exhibited more than double the deviation in fingertip force direction compared to asymptomatic digits.
  • The paretic thumb showed an 18% greater deviation in grip force direction than the paretic index finger.
  • Altered force direction was linked to abnormal muscle activation patterns, not initial digit posture, causing significant object slippage in 55% of trials.

Conclusions:

  • Altered grip force direction is a key impairment in hemiparetic hands following stroke.
  • This deviation, driven by muscle activation, leads to functional deficits like object slippage.
  • Therapeutic interventions aimed at correcting force direction could enhance grip stability in stroke survivors.