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A static dynamometer measuring simultaneous torques exerted at the upper limb

P Boissy1, D Bourbonnais, D Gravel

  • 1Research Center, Montreal Rehabilitation Institute and the School of Rehabilitation, Faculty of Medicine, University of Montreal, P.Q., Canada.

IEEE Transactions on Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society
|September 28, 1998
PubMed
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This study introduces a novel dynamometer for measuring multi-joint limb torques. Hemiparetic subjects showed higher torques on the affected side, indicating potential for motor deficit evaluation.

Area of Science:

  • Biomechanics
  • Neurorehabilitation
  • Medical Engineering

Background:

  • Existing dynamometers offer limited insights into global limb movement for neurological patients.
  • Quantifying motor incoordination requires comprehensive assessment of multi-joint dynamics.

Purpose of the Study:

  • To describe a novel static dynamometer capable of measuring simultaneous torques at the shoulder, elbow, and forearm.
  • To illustrate the dynamometer's utility in characterizing motor deficits in a hemiparetic subject.

Main Methods:

  • A static dynamometer measured simultaneous torques at shoulder, elbow, and forearm joints.
  • Strain gauge transducers recorded orthogonal forces at the arm and wrist.
  • Software calculated real-time joint torques using static equilibrium equations.

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Main Results:

  • The dynamometer successfully characterized joint torques during grip exertions in a hemiparetic subject.
  • Affected side torques at shoulder, elbow, and forearm were significantly higher than the non-affected side.
  • Increased grip force correlated with higher torques on the affected side.

Conclusions:

  • The novel dynamometer provides a comprehensive method for assessing multi-joint limb function.
  • Observed torque differences in hemiparetic subjects suggest loss of movement selectivity post-central nervous system lesion.
  • This technology holds promise for evaluating and rehabilitating neurological patient populations.