Roll-over shape of a prosthetic foot: a finite element evaluation and experimental validation

Prosthetic feet have generally been designed experimentally by adopting a trial-and-error technique. The objective of this research is to introduce a novel numerical approach for the a priori evaluation of the roll-over shape (ROS) of a prosthetic foot for application in its systematic design and de...

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Bibliographic Details
Published in:Medical & biological engineering & computing Vol. 58; no. 10; pp. 2259 - 2270
Main Authors: Balaramakrishnan, Thirunindravur Mannan, Natarajan, Sundararajan, Srinivasan, Sujatha
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.10.2020
Springer Nature B.V
Subjects:
Ankle
Biomedical and Life Sciences
Biomedical Engineering and Bioengineering
Biomedicine
Compression
Compression tests
Computer Applications
Design
Design parameters
Error analysis
Feet
Finite element method
Human Physiology
Imaging
Material properties
Numerical models
Optical properties
Original Article
Prostheses
Radiology
Radius of curvature
Artificial limbs
Walking
Finite element analysis
Gait
Foot
ISSN:0140-0118, 1741-0444, 1741-0444
Online Access:Get full text
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Summary:Prosthetic feet have generally been designed experimentally by adopting a trial-and-error technique. The objective of this research is to introduce a novel numerical approach for the a priori evaluation of the roll-over shape (ROS) of a prosthetic foot for application in its systematic design and development. The ROS was achieved numerically by employing a non-linear finite element model incorporating the augmented Lagrangian and multi-point constraint contact formulations, a hyperelastic material model and a higher-order strain definition. The Ottobock Solid Ankle Cushion Heel (SACH) foot was chosen to experimentally validate the numerical model. The geometry of the foot was evaluated from optical scans, and the material properties were obtained from uniaxial tensile, shear and volumetric compression tests. A new setup was designed for an improved experimental determination of the ROS, with the inclusion of an extended moment arm and variable loading. Error analysis of the radius of curvature of the ROS between the numerical and experimental results showed the percentage error to be 7.52%, thereby establishing the validity of the model. A numerical design model of this kind can be utilised to vary the input design parameters to arrive at a prosthetic foot with specified performance characteristics effectively and economically. Graphical abstract
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ISSN:0140-0118
1741-0444
1741-0444
DOI:10.1007/s11517-020-02214-9