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A static dynamometer measuring multidirectional torques exerted simultaneously at the hip and knee

D Bourbonnais1, P Duval, D Gravel

  • 1Ecole de Réadaptation, Université de Montréal, Québec, Canada.

Journal of Biomechanics
|March 1, 1993
PubMed
Summary
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This study introduces a new multidirectional dynamometer for measuring hip and knee torques. The instrument is validated as reliable and precise for assessing lower limb muscle function.

Area of Science:

  • Biomechanics
  • Kinesiology
  • Orthopedics

Background:

  • Accurate measurement of lower limb muscle torques is crucial for understanding biomechanical function and diagnosing musculoskeletal disorders.
  • Existing dynamometers may have limitations in assessing multidirectional torques at the hip and knee simultaneously.

Purpose of the Study:

  • To describe the function of a novel static dynamometer designed to measure simultaneous torques in multiple anatomical planes of the hip and knee.
  • To validate the reliability and accuracy of this multidirectional dynamometer for lower limb biomechanical analysis.

Main Methods:

  • The dynamometer measures orthogonal forces and lever arm values to calculate muscular torques in real-time.
  • Reliability was assessed using calibrated weights, and validity was confirmed using a mechanical lower limb simulator.

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  • The instrument's utility was demonstrated by evaluating specific muscle group activity and biarticular muscle function.

    • Main Results:

    • Force transducers demonstrated high reliability, yielding identical outputs over multiple testing days.
    • Dynamometer measurements showed high concordance with known torques applied by the mechanical simulator, confirming measurement validity.
    • The dynamometer successfully evaluated the activity of rectus femoris and biceps femoris muscles and assessed hip torques during knee efforts.

    Conclusions:

    • The developed biarticular and multidirectional dynamometer is a valid, reliable, and precise instrument.
    • This tool offers significant potential for evaluating lower limb muscular function in clinical and research settings.