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Preliminary investigation of a novel controlled stiffness proximal femoral prosthesis

Preliminary investigation of a novel controlled stiffness proximal femoral prosthesis
Preliminary investigation of a novel controlled stiffness proximal femoral prosthesis
Previous studies have suggested that a controlled stiffness prosthesis is required to address the conflicting requirements of minimizing stress shielding and micromotion. The design for a controlled stiffness prosthesis is proposed and a preliminary analytical investigation performed to assess its predicted performance before fabrication of a prototype component. The novel prosthesis consisted of a cobalt–chrome core and a flexible composite outer layer. Varying the composite layer thickness allowed the prosthesis stiffness to be controlled. Three variants of the controlled stiffness prosthesis were critically assessed using the finite element method and their predicted performance compared with those of conventional prosthesis designs. The potential for stress shielding was assessed by examining the periosteal strain energy and the potential for migration assessed by examining the endosteal minimum principal cancellous bone stresses. Both the conventional and controlled stiffness implants performed poorly as press-fit prostheses. All the press-fit prostheses generated high cancellous bone stresses, suggesting that excessive migration of these implants would be likely. The controlled stiffness implants performed better than the conventional implants when bonded to the surrounding bone. Although the controlled stiffness implants did not eliminate stress shielding of the calcar, they produced higher strain energies than the conventional designs. The findings of this study are that osseointegrated controlled stiffness implants may perform better than current osseointegrated cementless prostheses and therefore it is worth while progressing to the next stage, of prototyping an implant.
optimized, stiffness, controlled, cancellous, bone, stress, strain, energy
0954-4119
165-175
Simoes, J.A.
519d2c56-9951-4a96-8535-8cc0ca0a0c55
Taylor, M.
bdd7186d-4fda-4a39-bddb-9fcbbe25fcaa
Marques, A.T.
f62f4488-02ab-4661-a87c-5311c27aff8e
Jeronimidis, G.
b043c14e-4e07-47df-ba26-a5d67b1fa675
Simoes, J.A.
519d2c56-9951-4a96-8535-8cc0ca0a0c55
Taylor, M.
bdd7186d-4fda-4a39-bddb-9fcbbe25fcaa
Marques, A.T.
f62f4488-02ab-4661-a87c-5311c27aff8e
Jeronimidis, G.
b043c14e-4e07-47df-ba26-a5d67b1fa675

Simoes, J.A., Taylor, M., Marques, A.T. and Jeronimidis, G. (1998) Preliminary investigation of a novel controlled stiffness proximal femoral prosthesis. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 212 (3), 165-175.

Record type: Article

Abstract

Previous studies have suggested that a controlled stiffness prosthesis is required to address the conflicting requirements of minimizing stress shielding and micromotion. The design for a controlled stiffness prosthesis is proposed and a preliminary analytical investigation performed to assess its predicted performance before fabrication of a prototype component. The novel prosthesis consisted of a cobalt–chrome core and a flexible composite outer layer. Varying the composite layer thickness allowed the prosthesis stiffness to be controlled. Three variants of the controlled stiffness prosthesis were critically assessed using the finite element method and their predicted performance compared with those of conventional prosthesis designs. The potential for stress shielding was assessed by examining the periosteal strain energy and the potential for migration assessed by examining the endosteal minimum principal cancellous bone stresses. Both the conventional and controlled stiffness implants performed poorly as press-fit prostheses. All the press-fit prostheses generated high cancellous bone stresses, suggesting that excessive migration of these implants would be likely. The controlled stiffness implants performed better than the conventional implants when bonded to the surrounding bone. Although the controlled stiffness implants did not eliminate stress shielding of the calcar, they produced higher strain energies than the conventional designs. The findings of this study are that osseointegrated controlled stiffness implants may perform better than current osseointegrated cementless prostheses and therefore it is worth while progressing to the next stage, of prototyping an implant.

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More information

Published date: 1998
Keywords: optimized, stiffness, controlled, cancellous, bone, stress, strain, energy

Identifiers

Local EPrints ID: 21204
URI: http://eprints.soton.ac.uk/id/eprint/21204
ISSN: 0954-4119
PURE UUID: 7a1f4efa-76cd-437c-b833-8e636c1e0b63

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Date deposited: 10 Nov 2006
Last modified: 15 Jul 2019 19:24

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Contributors

Author: J.A. Simoes
Author: M. Taylor
Author: A.T. Marques
Author: G. Jeronimidis

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