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Combined sagittal and coronal plane postural stability model.

K D Bustamante Valles1, J M Schneider, J T Long

  • 1Orthopaedic and Rehabilitation Engineering Center, Milwaukee, WI, USA.

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|October 20, 2007
PubMed
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This study models body sway using an inverted pendulum, incorporating subtalar movement to analyze both anterior-posterior and medial-lateral body motion. Findings help refine posture control models by simulating sway dynamics.

Area of Science:

  • Biomechanics
  • Human Posture Control
  • Robotics

Background:

  • Postural control is crucial for stability, involving complex feedback mechanisms.
  • Previous models often simplify body dynamics, limiting analysis of multi-directional sway.
  • Understanding medial-lateral (ML) sway requires detailed modeling of foot and ankle contributions.

Purpose of the Study:

  • To extend a sagittal plane posture model to include medial-lateral (ML) body sway.
  • To investigate parameters influencing ML sway within an inverted pendulum framework.
  • To compare experimental center of pressure (COP) data with model simulations for both anterior-posterior (AP) and ML sway.

Main Methods:

  • Utilized a classic inverted pendulum model with subtalar joint movement.

Related Experiment Videos

  • Adapted a feedback control posture model for sagittal plane analysis.
  • Collected center of pressure (COP) data from 8 healthy adults using a dual AMTI force plate system.
  • Calculated 14 distinct sway metrics from the experimental data.

    • Main Results:

    • Successfully modeled ML sway components by adjusting model parameters.
    • Compared experimental COP data with simulations, achieving good agreement for both AP and ML sway.
    • Demonstrated the feasibility of reproducing combined AP and ML sway dynamics through parameter variation.

    Conclusions:

    • The extended inverted pendulum model can effectively simulate combined anterior-posterior (AP) and medial-lateral (ML) body sway.
    • Subtalar movement is a key parameter for accurately modeling ML sway.
    • This approach provides a foundation for more comprehensive postural control research.