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Correcting lower limb segment axis misalignment in gait analysis: A simple geometrical method.

Alexandre Naaim1, Alice Bonnefoy-Mazure2, Stéphane Armand2

  • 1Univ Lyon, Université Claude Bernard Lyon 1, IFSTTAR, LBMC UMR_T9406, F69622, Lyon, France.

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|May 29, 2019
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Summary
This summary is machine-generated.

A new geometrical method improves thigh medial-lateral axis definition in gait analysis, reducing crosstalk and enhancing hip rotation reproducibility. This approach offers a more accessible alternative for clinical applications.

Keywords:
Clinical gait analysisGaitHip internal-external rotation reproducibilityKnee crosstalk

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Area of Science:

  • Biomechanics
  • Clinical Gait Analysis
  • Orthopedic Surgery

Background:

  • Precise clinical gait analysis is crucial for patient outcomes.
  • Thigh medial-lateral axis definition challenges impact hip rotation profiles and introduce crosstalk, artificially inflating knee adduction-abduction.
  • This error affects the accuracy of gait measurements, particularly in patients with knee prostheses.

Purpose of the Study:

  • To introduce and evaluate a novel a posteriori geometrical method for correcting thigh medial-lateral axis definition.
  • To reduce crosstalk-related errors in clinical gait analysis.
  • To improve the accuracy and reproducibility of hip rotation measurements.

Main Methods:

  • The proposed geometrical method defines the thigh medial-lateral axis using the normal to the mean sagittal plane derived from joint centers.
  • Performance was compared against an optimization method using existing data from 75 knee prosthesis patients at 3 months and 1 year post-surgery.
  • Three-dimensional hip and knee angles were computed, with crosstalk quantified by r² and amplitude, and hip rotation reproducibility assessed using ICC.

Main Results:

  • The geometrical method significantly reduced crosstalk from r²=0.67 to r²=0.51, though it remained higher than the optimization method (r²<0.01).
  • Both methods improved hip internal-external rotation reproducibility from poor (ICC=0.34) to moderate (geometrical: ICC=0.65; optimization: ICC=0.73).
  • The geometrical method requires less patient movement, making it suitable for a broader patient population.

Conclusions:

  • The proposed geometrical method effectively corrects thigh medial-lateral axis definition and reduces crosstalk in gait analysis.
  • This method enhances hip rotation reproducibility, offering a valuable tool for clinical settings.
  • Its minimal movement requirement makes it a practical and accessible option for diverse patient groups undergoing gait analysis.