Design of 3D printable prosthetic foot to implement nonlinear stiffness behavior of human toe joint based on finite element analysis

Abstract Toe joint is known as one of the critical factors in designing a prosthetic foot due to its nonlinear stiffness characteristic. This stiffness characteristic provides a general feeling of springiness in the toe-off and it also affects the ankle kinetics. In this study, the toe part of the p...

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Autores principales:	Hui-Jin Um, Heon-Su Kim, Woolim Hong, Hak-Sung Kim, Pilwon Hur
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3db268981e7d4253aa3b2deea0f92201
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spelling	oai:doaj.org-article:3db268981e7d4253aa3b2deea0f922012021-12-02T16:56:36ZDesign of 3D printable prosthetic foot to implement nonlinear stiffness behavior of human toe joint based on finite element analysis10.1038/s41598-021-98839-32045-2322https://doaj.org/article/3db268981e7d4253aa3b2deea0f922012021-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98839-3https://doaj.org/toc/2045-2322Abstract Toe joint is known as one of the critical factors in designing a prosthetic foot due to its nonlinear stiffness characteristic. This stiffness characteristic provides a general feeling of springiness in the toe-off and it also affects the ankle kinetics. In this study, the toe part of the prosthetic foot was designed to improve walking performance. The toe joint was implemented as a single part suitable for 3D printing. The various shape factors such as curved shape, bending space, auxetic structure, and bending zone were applied to mimic human foot characteristics. The finite element analysis (FEA) was conducted to simulate terminal stance (from heel-off to toe-off) using the designed prosthetic foot. To find the structure with characteristics similar to the human foot, the optimization was performed based on the toe joint geometries. As a result, the optimized foot showed good agreement with human foot behavior in the toe torque-angle curve. Finally, the simulation conditions were validated by comparing with human walking data and it was confirmed that the designed prosthetic foot structure can implement the human foot function.Hui-Jin UmHeon-Su KimWoolim HongHak-Sung KimPilwon HurNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hui-Jin Um Heon-Su Kim Woolim Hong Hak-Sung Kim Pilwon Hur Design of 3D printable prosthetic foot to implement nonlinear stiffness behavior of human toe joint based on finite element analysis
description	Abstract Toe joint is known as one of the critical factors in designing a prosthetic foot due to its nonlinear stiffness characteristic. This stiffness characteristic provides a general feeling of springiness in the toe-off and it also affects the ankle kinetics. In this study, the toe part of the prosthetic foot was designed to improve walking performance. The toe joint was implemented as a single part suitable for 3D printing. The various shape factors such as curved shape, bending space, auxetic structure, and bending zone were applied to mimic human foot characteristics. The finite element analysis (FEA) was conducted to simulate terminal stance (from heel-off to toe-off) using the designed prosthetic foot. To find the structure with characteristics similar to the human foot, the optimization was performed based on the toe joint geometries. As a result, the optimized foot showed good agreement with human foot behavior in the toe torque-angle curve. Finally, the simulation conditions were validated by comparing with human walking data and it was confirmed that the designed prosthetic foot structure can implement the human foot function.
format	article
author	Hui-Jin Um Heon-Su Kim Woolim Hong Hak-Sung Kim Pilwon Hur
author_facet	Hui-Jin Um Heon-Su Kim Woolim Hong Hak-Sung Kim Pilwon Hur
author_sort	Hui-Jin Um
title	Design of 3D printable prosthetic foot to implement nonlinear stiffness behavior of human toe joint based on finite element analysis
title_short	Design of 3D printable prosthetic foot to implement nonlinear stiffness behavior of human toe joint based on finite element analysis
title_full	Design of 3D printable prosthetic foot to implement nonlinear stiffness behavior of human toe joint based on finite element analysis
title_fullStr	Design of 3D printable prosthetic foot to implement nonlinear stiffness behavior of human toe joint based on finite element analysis
title_full_unstemmed	Design of 3D printable prosthetic foot to implement nonlinear stiffness behavior of human toe joint based on finite element analysis
title_sort	design of 3d printable prosthetic foot to implement nonlinear stiffness behavior of human toe joint based on finite element analysis
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3db268981e7d4253aa3b2deea0f92201
work_keys_str_mv	AT huijinum designof3dprintableprostheticfoottoimplementnonlinearstiffnessbehaviorofhumantoejointbasedonfiniteelementanalysis AT heonsukim designof3dprintableprostheticfoottoimplementnonlinearstiffnessbehaviorofhumantoejointbasedonfiniteelementanalysis AT woolimhong designof3dprintableprostheticfoottoimplementnonlinearstiffnessbehaviorofhumantoejointbasedonfiniteelementanalysis AT haksungkim designof3dprintableprostheticfoottoimplementnonlinearstiffnessbehaviorofhumantoejointbasedonfiniteelementanalysis AT pilwonhur designof3dprintableprostheticfoottoimplementnonlinearstiffnessbehaviorofhumantoejointbasedonfiniteelementanalysis
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Design of 3D printable prosthetic foot to implement nonlinear stiffness behavior of human toe joint based on finite element analysis

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