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Key considerations for finite element modelling of the residuum-prosthetic socket interface
Joshua W Steer1, Peter R Worsley2, Martin Browne1
1Bioengineering Science Research Group, School of Engineering, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK.
Prosthetics and Orthotics International
|November 12, 2020
Summary
Finite element modeling for prosthetic socket design requires careful consideration of loading, interface friction, and material properties. Best practices ensure accurate biomechanical predictions for improved prosthetic fitting and patient outcomes.
Area of Science:
- Biomechanics
- Computational modeling
- Prosthetics
Background:
- Finite element modeling (FEM) is proposed for prosthetic socket design.
- Limited literature exists on developing and interpreting complex, nonlinear FEM for prosthetics.
Purpose of the Study:
- Identify best practice recommendations for FEM of lower limb prosthetics.
- Consider key modeling approaches and inputs for prosthetic socket design.
Main Methods:
- Developed a parametric FEM using MRI data from a transtibial amputee.
- Performed comparative analyses of socket loading, interface parameters, and soft tissue models.
- Quantified the biomechanical response of the residuum to various socket designs.
Main Results:
- Socket loading methods, interface parameters, and soft tissue models significantly impacted FEM predictions.
- Limb-socket interface pressure and soft tissue shear distribution were notably affected.
- Demonstrated the influence of modeling choices on biomechanical outcomes.
Conclusions:
- Justify all modeling decisions biomechanically and clinically.
- Incorporate donning and friction for accurate soft tissue shear stress prediction.
- Utilize stiffness hyperelastic material models for soft tissues to predict injury.
- Interrogate models comparatively against a clinical control for validation.
