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Within-Session Reliability and Minimum Detectable Differences for Discrete Lower-Extremity Angles and Moments During

Jillian L Hawkins1, Clare E Milner1

  • 1Drexel University.

Journal of Applied Biomechanics
|August 24, 2021
PubMed
Summary

This study determined the within-session reliability and minimum detectable differences (MDDs) for lower-extremity walking biomechanics. Findings show good to excellent reliability, providing crucial data for interpreting walking gait analysis in healthy men.

Keywords:
anklehipkinematicskineticsknee

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Area of Science:

  • Biomechanics
  • Human Movement Analysis
  • Orthopedics

Background:

  • Meaningful differences in walking biomechanics require exceeding measurement error.
  • Reliability and minimum detectable differences (MDDs) for lower-extremity angles and moments during walking are not well-established for within-session comparisons.
  • Understanding within-session variability is crucial for interpreting cross-sectional studies on gait.

Purpose of the Study:

  • To determine the within-session reliability of peak lower-extremity angles and moments during walking.
  • To calculate the minimum detectable differences (MDDs) for these kinematic and kinetic variables.
  • To provide data for interpreting gait analysis findings in healthy men.

Main Methods:

  • Three-dimensional gait analysis was employed to record walking at 1.25 m/s (±5%) in 18 healthy men (18-50 years).
  • Peak ankle, knee, and hip angles and moments were calculated from two sets of three walking trials.
  • Within-session reliability was assessed using intraclass correlation coefficients (ICC(3,3)), and MDDs were calculated.

Main Results:

  • Within-session reliability for all measured lower-extremity angles and moments during walking was good to excellent.
  • Minimum detectable differences (MDDs) ranged from 0.9° to 3.6° for joint angles and 0.06 to 0.15 N·m/kg for joint moments.
  • Within-session reliability was superior to previously reported between-session reliability, with similar or smaller MDDs.

Conclusions:

  • Within-session reliability for lower-extremity biomechanics during walking is high in healthy men.
  • The established MDDs provide a benchmark for interpreting the significance of observed differences in gait parameters.
  • These findings support the use of the determined MDDs for robust cross-sectional comparisons of walking biomechanics.