Analysis of Rollover Shape and Energy Storage and Return in Cantilever Beam-Type Prosthetic Feet

This paper presents an analysis of the rollover shape and energy storage and return in a prosthetic foot made from a compliant cantilevered beam. The rollover shape of a prosthetic foot is defined as the path of the center of pressure along the bottom of the foot during stance phase of gait, from he...

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Main Authors: Olesnavage, Kathryn, Winter, Amos
Other Authors: Massachusetts Institute of Technology. Department of Mechanical Engineering
Format: Article
Language:en_US
Published: ASME International 2015
Online Access:http://hdl.handle.net/1721.1/98256
https://orcid.org/0000-0002-4151-0889
https://orcid.org/0000-0002-2940-2383
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author Olesnavage, Kathryn
Winter, Amos
author2 Massachusetts Institute of Technology. Department of Mechanical Engineering
author_facet Massachusetts Institute of Technology. Department of Mechanical Engineering
Olesnavage, Kathryn
Winter, Amos
author_sort Olesnavage, Kathryn
collection MIT
description This paper presents an analysis of the rollover shape and energy storage and return in a prosthetic foot made from a compliant cantilevered beam. The rollover shape of a prosthetic foot is defined as the path of the center of pressure along the bottom of the foot during stance phase of gait, from heel strike to toe off. This path is rotated into the reference frame of the ankle-knee segment of the leg, which is held fixed. In order to achieve correct limb loading and gait kinematics, it is important that a prosthetic foot both mimic the physiological rollover shape and maximize energy storage and return. The majority of prosthetic feet available on the market are cantilever beam-type feet that emulate ankle dorsiflexion through beam bending. In this study, we show analytically that a prosthetic foot consisting of a beam with constant or monotonically decreasing cross-section cannot replicate physiological rollover shape; the foot is either too stiff when the ground reaction force (GRF) acts near the ankle, or too compliant when the GRF acts near the toe. A rigid constraint is required to prevent the foot from over-deflecting. Using finite element analysis (FEA), we investigated how closely a cantilever beam with constrained maximum deflection could mimic physiological rollover shape and energy storage/return during stance phase. A constrained beam with constant cross-section is able to replicate physiological rollover shape with R[superscript 2] = 0.86. The ratio of the strain energy stored and returned by the beam compared to the ideal energy storage and return is 0.504. This paper determines that there is a trade off between rollover shape and energy storage and return in cantilever beam-type prosthetic feet. The method and results presented in this paper demonstrate a useful tool in early stage prosthetic foot design that can be used to predict the rollover shape and energy storage of any type of prosthetic foot.
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spelling mit-1721.1/982562022-09-28T17:41:36Z Analysis of Rollover Shape and Energy Storage and Return in Cantilever Beam-Type Prosthetic Feet Olesnavage, Kathryn Winter, Amos Massachusetts Institute of Technology. Department of Mechanical Engineering Olesnavage, Kathryn Winter, Amos This paper presents an analysis of the rollover shape and energy storage and return in a prosthetic foot made from a compliant cantilevered beam. The rollover shape of a prosthetic foot is defined as the path of the center of pressure along the bottom of the foot during stance phase of gait, from heel strike to toe off. This path is rotated into the reference frame of the ankle-knee segment of the leg, which is held fixed. In order to achieve correct limb loading and gait kinematics, it is important that a prosthetic foot both mimic the physiological rollover shape and maximize energy storage and return. The majority of prosthetic feet available on the market are cantilever beam-type feet that emulate ankle dorsiflexion through beam bending. In this study, we show analytically that a prosthetic foot consisting of a beam with constant or monotonically decreasing cross-section cannot replicate physiological rollover shape; the foot is either too stiff when the ground reaction force (GRF) acts near the ankle, or too compliant when the GRF acts near the toe. A rigid constraint is required to prevent the foot from over-deflecting. Using finite element analysis (FEA), we investigated how closely a cantilever beam with constrained maximum deflection could mimic physiological rollover shape and energy storage/return during stance phase. A constrained beam with constant cross-section is able to replicate physiological rollover shape with R[superscript 2] = 0.86. The ratio of the strain energy stored and returned by the beam compared to the ideal energy storage and return is 0.504. This paper determines that there is a trade off between rollover shape and energy storage and return in cantilever beam-type prosthetic feet. The method and results presented in this paper demonstrate a useful tool in early stage prosthetic foot design that can be used to predict the rollover shape and energy storage of any type of prosthetic foot. MIT Tata Center for Technology and Design Massachusetts Institute of Technology. Department of Mechanical Engineering MIT International Science and Technology Initiatives (India Innovation Fund) 2015-08-26T17:25:21Z 2015-08-26T17:25:21Z 2014-08 Article http://purl.org/eprint/type/ConferencePaper 978-0-7918-4636-0 http://hdl.handle.net/1721.1/98256 Olesnavage, Kathryn M., and Amos G. Winter. “Analysis of Rollover Shape and Energy Storage and Return in Cantilever Beam-Type Prosthetic Feet.” Volume 5A: 38th Mechanisms and Robotics Conference (August 17, 2014). https://orcid.org/0000-0002-4151-0889 https://orcid.org/0000-0002-2940-2383 en_US http://dx.doi.org/10.1115/DETC2014-35174 Volume 5A: 38th Mechanisms and Robotics Conference Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf ASME International Prof. Winter via Angie Locknar
spellingShingle Olesnavage, Kathryn
Winter, Amos
Analysis of Rollover Shape and Energy Storage and Return in Cantilever Beam-Type Prosthetic Feet
title Analysis of Rollover Shape and Energy Storage and Return in Cantilever Beam-Type Prosthetic Feet
title_full Analysis of Rollover Shape and Energy Storage and Return in Cantilever Beam-Type Prosthetic Feet
title_fullStr Analysis of Rollover Shape and Energy Storage and Return in Cantilever Beam-Type Prosthetic Feet
title_full_unstemmed Analysis of Rollover Shape and Energy Storage and Return in Cantilever Beam-Type Prosthetic Feet
title_short Analysis of Rollover Shape and Energy Storage and Return in Cantilever Beam-Type Prosthetic Feet
title_sort analysis of rollover shape and energy storage and return in cantilever beam type prosthetic feet
url http://hdl.handle.net/1721.1/98256
https://orcid.org/0000-0002-4151-0889
https://orcid.org/0000-0002-2940-2383
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