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The Conventional Gait Model's sensitivity to lower-limb marker placement.

M Fonseca1,2, M Bergere3, J Candido4

  • 1Kinesiology Laboratory, Geneva University Hospitals and University of Geneva, Geneva, Switzerland. mickael.cardosofonseca@hcuge.ch.

Scientific Reports
|August 20, 2022
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Summary
This summary is machine-generated.

Marker placement significantly impacts clinical gait analysis reproducibility. Precise placement of femoral and tibial markers, especially the lateral femoral epicondyle, is crucial for accurate kinematic data in children with motor disorders.

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Area of Science:

  • Biomechanics
  • Clinical Biomechanics
  • Movement Science

Background:

  • Clinical gait analysis is vital for diagnosing and managing motor disorders.
  • Measurement errors, particularly marker misplacement, are a primary source of variability in gait analysis.
  • The precise impact of marker placement errors on kinematic output remains incompletely understood.

Purpose of the Study:

  • To quantify the sensitivity of the Conventional Gait Model to lower-limb marker placement errors.
  • To identify specific markers and displacement directions that most influence gait kinematics.
  • To establish guidelines for optimal marker placement to enhance gait analysis reliability.

Main Methods:

  • Utilized a dataset of lower-limb kinematics from 20 children.
  • Virtually displaced eight lower-limb markers by 10 mm in anterior-posterior, medial-lateral, superior-inferior, and rotational planes.
  • Recalculated kinematics and computed root-mean-square deviation angles to assess deviations from original data.

Main Results:

  • Femoral and tibial wands, along with the lateral femoral epicondyle marker displaced along the anterior-posterior axis, showed the most significant impact on kinematics.
  • Displacement of the femoral wand alone resulted in a mean hip rotation deviation of 7.3° (±1.8°).
  • Approximately 40% of simulations exceeded the 5° acceptable deviation limit, particularly affecting transversal plane measurements.

Conclusions:

  • Marker placement accuracy is critical for reliable clinical gait analysis.
  • Specific markers (femoral wand, tibial wand, lateral femoral epicondyle) require meticulous placement, especially in the anterior-posterior direction.
  • Findings provide crucial insights for improving marker placement protocols to enhance the reproducibility and validity of gait analysis data.