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Implantable strain sensor to monitor fracture healing with standard radiography

Abstract Current orthopaedic clinical methods do not provide an objective measure of fracture healing or weight bearing for lower extremity fractures. The following report describes a novel approach involving in-situ strain sensors to objectively measure fracture healing. The sensor uses a cantileve...

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Autores principales:	Hunter Pelham, Donald Benza, Paul W. Millhouse, Nathan Carrington, Md. Arifuzzaman, Caleb J. Behrend, Jeffrey N. Anker, John D. DesJardins
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/56eb88bdeeb445b089c6ed64d43821a0
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spelling	oai:doaj.org-article:56eb88bdeeb445b089c6ed64d43821a02021-12-02T15:05:27ZImplantable strain sensor to monitor fracture healing with standard radiography10.1038/s41598-017-01009-72045-2322https://doaj.org/article/56eb88bdeeb445b089c6ed64d43821a02017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01009-7https://doaj.org/toc/2045-2322Abstract Current orthopaedic clinical methods do not provide an objective measure of fracture healing or weight bearing for lower extremity fractures. The following report describes a novel approach involving in-situ strain sensors to objectively measure fracture healing. The sensor uses a cantilevered indicator pin that responds to plate bending and an internal scale to demonstrate changes in the pin position on plain film radiographs. The long lever arm amplifies pin movement compared to interfragmentary motion, and the scale enables more accurate measurement of position changes. Testing with a human cadaver comminuted metaphyseal tibia fracture specimen demonstrated over 2.25 mm of reproducible sensor displacement on radiographs with as little as 100 N of axial compressive loading. Finite element simulations determined that pin displacement decreases as the fracture callus stiffens and that pin motion is linearly related to the strain in the callus. These results indicate that an implanted strain sensor is an effective tool to help assess bone healing after internal fixation and could provide an objective clinical measure for return to weight bearing.Hunter PelhamDonald BenzaPaul W. MillhouseNathan CarringtonMd. ArifuzzamanCaleb J. BehrendJeffrey N. AnkerJohn D. DesJardinsNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hunter Pelham Donald Benza Paul W. Millhouse Nathan Carrington Md. Arifuzzaman Caleb J. Behrend Jeffrey N. Anker John D. DesJardins Implantable strain sensor to monitor fracture healing with standard radiography
description	Abstract Current orthopaedic clinical methods do not provide an objective measure of fracture healing or weight bearing for lower extremity fractures. The following report describes a novel approach involving in-situ strain sensors to objectively measure fracture healing. The sensor uses a cantilevered indicator pin that responds to plate bending and an internal scale to demonstrate changes in the pin position on plain film radiographs. The long lever arm amplifies pin movement compared to interfragmentary motion, and the scale enables more accurate measurement of position changes. Testing with a human cadaver comminuted metaphyseal tibia fracture specimen demonstrated over 2.25 mm of reproducible sensor displacement on radiographs with as little as 100 N of axial compressive loading. Finite element simulations determined that pin displacement decreases as the fracture callus stiffens and that pin motion is linearly related to the strain in the callus. These results indicate that an implanted strain sensor is an effective tool to help assess bone healing after internal fixation and could provide an objective clinical measure for return to weight bearing.
format	article
author	Hunter Pelham Donald Benza Paul W. Millhouse Nathan Carrington Md. Arifuzzaman Caleb J. Behrend Jeffrey N. Anker John D. DesJardins
author_facet	Hunter Pelham Donald Benza Paul W. Millhouse Nathan Carrington Md. Arifuzzaman Caleb J. Behrend Jeffrey N. Anker John D. DesJardins
author_sort	Hunter Pelham
title	Implantable strain sensor to monitor fracture healing with standard radiography
title_short	Implantable strain sensor to monitor fracture healing with standard radiography
title_full	Implantable strain sensor to monitor fracture healing with standard radiography
title_fullStr	Implantable strain sensor to monitor fracture healing with standard radiography
title_full_unstemmed	Implantable strain sensor to monitor fracture healing with standard radiography
title_sort	implantable strain sensor to monitor fracture healing with standard radiography
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/56eb88bdeeb445b089c6ed64d43821a0
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Implantable strain sensor to monitor fracture healing with standard radiography

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