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Related Experiment Videos

Contact force ratio: a new parameter to assess foot arch function.

A K L Leung1, J C Y Cheng, M Zhang

  • 1Jockey Club Rehabilitation Engineering Centre, The Hong Kong Polytechnic University, Hong Kong, China. rcaaron@polyu.edu.hk

Prosthetics and Orthotics International
|September 24, 2004
PubMed
Summary

A new dynamic footprint parameter, the Contact Force Ratio (CFR), reliably measures midfoot loading during gait. This method offers a more accurate assessment of foot function compared to static measurements.

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Sports Medicine

Background:

  • Static footprint parameters for arch height assessment yield inconsistent results.
  • The dynamic nature of the foot during gait necessitates dynamic analysis for accurate functional reflection.
  • Existing methods may lack the precision required for reliable foot function evaluation.

Purpose of the Study:

  • To introduce and test the reliability and validity of a novel dynamic footprint parameter, the Contact Force Ratio (CFR).
  • To assess midfoot loading during gait using dynamic footprints.
  • To establish CFR as a dependable measure for evaluating weight-bearing foot function.

Main Methods:

  • Forty volunteer subjects participated in the reliability testing.
  • Dynamic footprints were captured mid-gait using a pressure sensing mat.

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  • Intratester and intertester reliability were assessed using Intraclass Correlation Coefficient (ICC) tests.
  • Validity was examined by correlating CFR with Navicular Drop (arch height change).

    • Main Results:

    • The Contact Force Ratio (CFR) demonstrated good intratester reliability (ICC = 0.918).
    • The CFR also showed good intertester reliability (ICC = 0.909).
    • Preliminary validity was supported by correlation with Navicular Drop measurements.

    Conclusions:

    • The Contact Force Ratio (CFR) is a reliable parameter for assessing midfoot loading during gait.
    • This dynamic approach offers a more accurate reflection of weight-bearing foot function than static methods.
    • CFR shows potential as a valuable tool in biomechanical and clinical assessments of the foot.