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Related Experiment Videos

A new bilateral closed chain assessment technique: methods and error analysis.

H P Davis1, D G Dolny

  • 1Interactive Performance Monitoring Research and Development, Pullman, WA 99163, USA. hdavis@turbonet.com

Medicine and Science in Sports and Exercise
|January 27, 2000
PubMed
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The Omnikinetic methodology offers excellent accuracy for evaluating lower extremity function. It is most sensitive to hip position changes during knee extension, providing valuable clinical insights.

Area of Science:

  • Biomechanics
  • Kinesiology
  • Clinical Biomechanics

Background:

  • Lower extremity function assessment is crucial for diagnosing and managing musculoskeletal conditions.
  • Existing methods may lack comprehensive joint-level analysis or sensitivity to subtle changes.

Purpose of the Study:

  • Introduce the Omnikinetic methodology for bilateral lower extremity function evaluation.
  • Characterize the sensitivity of the Omnikinetic system to various error sources.
  • Present typical data from an Omnikinetic assessment protocol.

Main Methods:

  • Utilized a 5-bar, 2-degree of freedom linkage to model lower extremity kinematics.
  • Employed dual-axis force transducers to measure forces and center of pressure at the foot.
  • Applied a Newton-Euler inverse dynamic model to compute net joint torques and powers for the ankle, knee, and hip.

Related Experiment Videos

  • Assessed error sensitivity by introducing instrumental, hip translation, and segmental length errors.

    • Main Results:

    • Instrumental errors resulted in mean errors below 4% for all variables.
    • Violations of the fixed hip assumption introduced mean errors under 15%.
    • Relative and absolute anthropometric errors were below 5% and 12%, respectively.

    Conclusions:

    • The Omnikinetic system provides a novel tool for comprehensive, joint-level bilateral lower extremity evaluation.
    • Demonstrated excellent instrumental accuracy.
    • Identified the fixed hip position assumption as the most significant factor influencing measurement accuracy, particularly in the final 20 degrees of knee extension.