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Fracture toughness of femoral head cancellous bone material in relation to noninvasive bone assessment measurements

Fracture toughness of femoral head cancellous bone material in relation to noninvasive bone assessment measurements
Fracture toughness of femoral head cancellous bone material in relation to noninvasive bone assessment measurements
There have been a number of studies relating the biomechanical properties of human bone cancellous and cortical (mainly stiffness and strength) to quantitative non-invasive ultrasound (QUS). The best correlations are obtained when mechanical tests are compared vs. contact QUS in-vitro. Few studies attempted to relate noninvasive QUS on cadavers against excised material of the same donors. This study aims to assess the fracture toughness, in addition to stiffness and strength, of cancellous femoral head bone of donors that have gone QUS investigations in-vivo. Both the in-vivo aspect and the toughness measurements of bone are elements that have never been examined before.
Heads of femurs were collected from osteoporotic and osteoarthritic patients. QUS was performed by 2 different peripheral scanners on 4 different sites. Disc and bar-shaped samples were prepared from the femoral heads to material standards for fracture toughness measurements. The densities of samples have been measured to allow minimization of scatter due to varying density. The bar specimens were broken in 3-point bending and the disc shaped one in tension, in both the crack mouth opening displacement was measured. The aim of the study was to investigate whether reliable toughness measurements can be made on cancellous bone (a material capable of large elastoplastic deformations), their dependence on trabecular type and architecture, sample density and the relationship to QUS in-vivo. Such data is currently lacking in the literature.
Cook, Richard
06f8322d-81be-4f82-9326-19e55541c78f
Zioupos, Peter
70120765-7396-4e86-bb9e-9c4d64c43294
Curwen, Christopher
455fc0f7-eaab-4caf-9634-8f6fee2a9554
Tasker, Tim
19566d9b-e368-4f6e-b3aa-7034b3875278
Cook, Richard
06f8322d-81be-4f82-9326-19e55541c78f
Zioupos, Peter
70120765-7396-4e86-bb9e-9c4d64c43294
Curwen, Christopher
455fc0f7-eaab-4caf-9634-8f6fee2a9554
Tasker, Tim
19566d9b-e368-4f6e-b3aa-7034b3875278

Cook, Richard, Zioupos, Peter, Curwen, Christopher and Tasker, Tim (2005) Fracture toughness of femoral head cancellous bone material in relation to noninvasive bone assessment measurements. Regensburg Applied Biomechanics Symposium, Germany. 01 - 03 Jun 2005.

Record type: Conference or Workshop Item (Paper)

Abstract

There have been a number of studies relating the biomechanical properties of human bone cancellous and cortical (mainly stiffness and strength) to quantitative non-invasive ultrasound (QUS). The best correlations are obtained when mechanical tests are compared vs. contact QUS in-vitro. Few studies attempted to relate noninvasive QUS on cadavers against excised material of the same donors. This study aims to assess the fracture toughness, in addition to stiffness and strength, of cancellous femoral head bone of donors that have gone QUS investigations in-vivo. Both the in-vivo aspect and the toughness measurements of bone are elements that have never been examined before.
Heads of femurs were collected from osteoporotic and osteoarthritic patients. QUS was performed by 2 different peripheral scanners on 4 different sites. Disc and bar-shaped samples were prepared from the femoral heads to material standards for fracture toughness measurements. The densities of samples have been measured to allow minimization of scatter due to varying density. The bar specimens were broken in 3-point bending and the disc shaped one in tension, in both the crack mouth opening displacement was measured. The aim of the study was to investigate whether reliable toughness measurements can be made on cancellous bone (a material capable of large elastoplastic deformations), their dependence on trabecular type and architecture, sample density and the relationship to QUS in-vivo. Such data is currently lacking in the literature.

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More information

Published date: June 2005
Venue - Dates: Regensburg Applied Biomechanics Symposium, Germany, 2005-06-01 - 2005-06-03
Organisations: nCATS Group

Identifiers

Local EPrints ID: 376575
URI: http://eprints.soton.ac.uk/id/eprint/376575
PURE UUID: ca544333-33ce-4982-abcc-719f92322c30

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Date deposited: 30 Apr 2015 16:21
Last modified: 17 Jul 2017 21:08

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