Combined gait asymmetry metric

Area of Science:

• Biomechanics
• Gait Analysis
• Rehabilitation Engineering

Background:

• Individuals with physical impairments frequently exhibit asymmetric gait patterns.
• Assessing improvements in gait symmetry during interventions requires a simple, comprehensive metric.
• Existing methods may focus on limited parameters, potentially overlooking overall gait dynamics.

Purpose of the Study:

• To introduce a novel Combined Gait Asymmetry Metric (CGAM) for evaluating overall gait symmetry.
• To demonstrate the utility of the CGAM in classifying gait patterns based on multiple asymmetry measures.
• To provide a straightforward metric applicable to various gait parameters for intervention assessment.

Main Methods:

• The Combined Gait Asymmetry Metric is developed using Mahalanobis distance applied to multiple gait parameters.
• Able-bodied subjects underwent perturbations simulating impairments (altered leg length, ankle weights).
• Mahalanobis distances were calculated relative to a perfect symmetry baseline to quantify asymmetry.

Main Results:

• The CGAM effectively quantifies asymmetry introduced by different perturbations.
• Analysis using the CGAM provides a more holistic perspective on gait asymmetry than individual parameter analysis.
• The metric demonstrated sensitivity to changes in gait symmetry under simulated impairment conditions.

Conclusions:

• The Combined Gait Asymmetry Metric offers a robust and simple method for evaluating gait symmetry.
• This metric can enhance the assessment of gait improvement in individuals undergoing physical rehabilitation.
• The CGAM is extensible to incorporate a wide range of spatiotemporal, kinematic, and kinetic parameters for comprehensive gait analysis.