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Updated: May 5, 2026

Asymmetric Walkway: A Novel Behavioral Assay for Studying Asymmetric Locomotion
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The functional gait deviation index.

Sajal Kaur Minhas1, Morgan Sangeux2, Julia Polak3

  • 1School of Mathematics and Statistics, University College Dublin, Belfield, Ireland.

Journal of Applied Statistics
|March 5, 2026
PubMed
Summary
This summary is machine-generated.

A new Functional Gait Deviation Index (FGDI) measures walking abnormality by considering joint smoothness and co-variation. This advanced gait analysis tool offers a more consistent and comprehensive assessment of gait function.

Keywords:
62H2562R10Kinematicsbiomechanicsfunctional data analysisgait pathologymultivariate functional principal components

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Rehabilitation Medicine

Background:

  • Gait analysis involves complex data from multiple joint angles.
  • Quantifying gait abnormality is crucial for assessing conditions and interventions.
  • Existing indices like gait deviation index lack consideration for movement smoothness and joint co-variation.

Purpose of the Study:

  • To introduce a novel measure, the Functional Gait Deviation Index (FGDI).
  • To incorporate joint movement smoothness and inter-joint co-variation into gait abnormality quantification.
  • To provide a more accurate and comprehensive gait analysis tool.

Main Methods:

  • Multivariate functional principal component analysis was utilized.
  • The FGDI was developed to account for intrinsic gait smoothness and joint co-variation.
  • Comparison with existing gait abnormality measures was performed.

Main Results:

  • The FGDI demonstrated scalability with overall gait function.
  • FGDI provides a consistent measure of gait abnormality.
  • The FGDI is easily implementable via an interactive web application.

Conclusions:

  • FGDI offers an improved method for quantifying gait abnormality.
  • The index enhances gait analysis by considering movement dynamics.
  • FGDI has practical applications in clinical settings and research.