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Related Experiment Video

Updated: Jun 26, 2026

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
08:24

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Published on: August 30, 2016

Posturographic analysis through markerless motion capture without ground reaction forces measurement.

Stefano Corazza1, Thomas P Andriacchi

  • 1Stanford University, Stanford, CA, USA. stefanoc@stanford.edu

Journal of Biomechanics
|January 17, 2009
PubMed
Summary

This study introduces a new markerless motion capture method to accurately track the center of mass (COM) and center of pressure (COP) for analyzing posture and balance. This advancement aids in diagnosing neuromuscular diseases without needing a force plate.

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Area of Science:

  • Biomechanics
  • Neurology
  • Medical Imaging

Background:

  • Posturographic analysis, crucial for diagnosing neuromuscular diseases, typically approximates the center of mass (COM) using center of pressure (COP) data.
  • Current methods often rely on force plates, limiting accessibility and comprehensive analysis of postural control.

Purpose of the Study:

  • To introduce and validate a novel markerless motion capture (MMC) method for accurately tracking both COM and COP.
  • To assess the feasibility of this new technique in clinical settings for evaluating posture and balance in neuromuscular conditions.

Main Methods:

  • Utilized a markerless motion capture system to generate a visual hull of subjects during quiet standing.
  • Developed and applied a new algorithm to calculate COM and COP from the visual hull data.

Related Experiment Videos

Last Updated: Jun 26, 2026

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb
08:24

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Published on: August 30, 2016

  • Validated the new method by comparing its COP calculations against direct force plate measurements.

    • Main Results:

    • The novel MMC method demonstrated high accuracy, with deviations between calculated and directly measured COP below 2mm.
    • This accuracy was maintained relative to the average range of movement, ensuring a satisfactory signal-to-noise ratio.
    • The method successfully identified the influence of individual body segments on COM motion without requiring a force plate.

    Conclusions:

    • The validated MMC method offers a reliable, force plate-free approach for tracking COM and COP.
    • This technique enhances the diagnostic and treatment evaluation capabilities for neuromuscular diseases by providing detailed kinematic data.
    • The ability to analyze individual body segment contributions advances the understanding of postural control mechanisms.