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Related Experiment Videos

Modeling initial contact dynamics during ambulation with dynamic simulation.

Andrew R Meyer1, Mei Wang, Peter A Smith

  • 1Orthopaedic and Rehabilitation Engineering Center, 735 N 17th St., Suite 105, Milwaukee, WI 53233, USA. andrew.meyer@mu.edu

Medical & Biological Engineering & Computing
|February 3, 2007
PubMed
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Altering ankle moments significantly impacts gait kinematics. Decreasing ankle moments caused greater deviations in hip, knee, and ankle motion compared to increasing them, highlighting the importance of precise ankle-foot orthoses adjustments.

Area of Science:

  • Biomechanics
  • Orthotics and Prosthetics
  • Computational Modeling

Background:

  • Ankle-foot orthoses (AFOs) are crucial for correcting pathological gait.
  • Understanding AFO effects on proximal joint kinematics and kinetics is vital for patient-specific prescriptions.
  • Mathematical Dynamic Model (MADYMO) offers a platform for simulating dynamic scenarios.

Purpose of the Study:

  • To investigate the forward dynamic simulation capabilities of MADYMO.
  • To examine the influence of altered internal sagittal ankle moments on knee and hip kinematics post-heel strike.
  • To assess the impact of ankle moment augmentation and attenuation on gait kinematics.

Main Methods:

  • Utilized MADYMO, a multibody dynamic simulation software.
  • Perturbed joint kinetics from an inverse model and used them as input for a forward dynamic model.

Related Experiment Videos

  • Simulated changes in internal sagittal ankle moment (augmentation and attenuation) following heel strike.

    • Main Results:

    • Decreasing internal ankle moments led to more pronounced kinematic deviations at the hip, knee, and ankle compared to increasing them.
    • Altered ankle moments produced distinct kinematic curve morphologies at the hip and knee.
    • Increased internal ankle moments resulted in kinematic patterns that rapidly normalized, while decreased moments showed greater, persistent deviations.

    Conclusions:

    • MADYMO is effective for forward dynamic simulations with kinetic inputs.
    • Internal ankle moment perturbations significantly influence proximal joint kinematics during gait.
    • This modeling approach can inform AFO design and predict muscle forces and external kinetics.