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Alternative modelling procedures for pelvic marker occlusion during motion analysis.

Jodie A McClelland1, Kate E Webster, Cameron Grant

  • 1School of Physiotherapy, La Trobe University, Melbourne, Victoria 3086, Australia. j.mcclelland@latrobe.edu.au

Gait & Posture
|February 24, 2010
PubMed
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Modified motion analysis models allow accurate lower limb kinematics calculation even with occluded pelvic markers. This research offers practical solutions for gait analysis in challenging populations and activities.

Area of Science:

  • Biomechanics
  • Human movement analysis
  • Clinical motion analysis

Background:

  • Marker occlusion during motion analysis, particularly anterior pelvic markers, hinders accurate lower limb kinematics in older adults and during activities involving trunk/hip flexion.
  • Existing modifications to standard body models lack detailed descriptions and their impact on kinematic calculations is unknown.

Purpose of the Study:

  • To evaluate alternative body modelling procedures in three-dimensional motion analysis when anterior pelvic markers are unavailable.
  • To assess the accuracy of lower limb kinematics calculated using modified models compared to the standard PlugIn Gait model.

Main Methods:

  • Collected 3D motion analysis data from 10 participants during level walking.
  • Processed data using the standard PlugIn Gait model and four alternative models with unlabelled anterior pelvic markers.

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  • Assessed similarity by comparing peak kinematic characteristics and Root Mean Square (RMS) values.

    • Main Results:

    • All four alternative modelling procedures yielded peak lower limb kinematics similar to PlugIn Gait within 4.57 degrees.
    • The most similar alternative procedure showed a difference of less than 1.24 degrees.
    • Root Mean Square (RMS) values ranged from 0.92 to 2.88 degrees.

    Conclusions:

    • Several validated options exist to modify standard motion analysis body models, enabling lower limb kinematics calculation without continuous visualization of anterior pelvic markers.
    • These alternative modelling procedures introduce minimal error, offering practical solutions for researchers and clinicians facing marker occlusion challenges.