A two-part, viscoelastic foot model for use in gait simulations

Area of Science:

• Biomechanics
• Human Gait Analysis
• Computational Modeling

Background:

• Previous human gait simulations often excluded the foot segment or rigidly fixed it, limiting biomechanical accuracy.
• Existing foot models lacked the necessary freedom of movement to closely replicate the physical system during gait.

Purpose of the Study:

• To develop a novel three-dimensional, two-part foot model for human gait simulation.
• To enhance the realism of gait simulations by accurately modeling the foot's viscoelastic behavior and movement.
• To improve the transition from the swing to stance phase in gait simulations.

Main Methods:

• Developed a 3D foot model using viscoelastic elements, simulating the foot in isolation from heel contact to toe-off.
• Employed nine linear, vertically oriented spring/damper systems to represent the foot, shoe, and floor's viscoelastic properties.
• Incorporated horizontal dampers for shear forces and torsional elements for ankle and foot axis control, driven by gait analysis data.

Main Results:

• The model accurately predicted kinetic and kinematic values, closely matching data from gait analysis.
• The simulation demonstrated a smooth and continuous transition from the swing to stance phase.
• The foot segment was not constrained to a specific trajectory, allowing for more natural movement.

Conclusions:

• The developed viscoelastic foot model offers a more accurate representation of human gait compared to previous methods.
• This model enhances biomechanical simulations by allowing natural foot motion and improving the swing-to-stance transition.
• The findings contribute to more realistic and precise computational models of human locomotion.