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Mechanical conditions in the internal stabilization of proximal tibial defects

Mechanical conditions in the internal stabilization of proximal tibial defects
Mechanical conditions in the internal stabilization of proximal tibial defects
Objectives
The goal was to design a method which would permit an assessment of the suitability of a newly developed implant under physiological-like loading conditions. Information obtained from such an analysis is expected to delineate more clearly the indications for a new device prior to clinical utilization.

Design
In vitro mechanical stiffness testing and finite element analysis.

Methods
From in vitro testing of proximal tibiae with defects, the stiffness of an internal stabilization system was determined. Using a finite element model, the loading of both the implant and bone was analyzed including all muscle forces. The variation in implant loading and interfragmentary strain for different defect locations was also investigated.

Results
Conventional stiffness testing demonstrated the comparability of the experimental findings with the finite element predictions. Under physiological-like loading the implant experienced high bending and von Mises stresses if defects in the region of the shaft were stabilized. A short working length increased implant loading up to the yield strength of the material.

Conclusions
The finite element analysis illustrated the appropriateness of this new device for proximal defects of the tibia, but the implant should be used hesitantly in fractures or defects extending into the diaphyseal region of the bone.

Relevance
This new analytical approach helped to identify clinical indications for the implant in which its mechanical attributes would prove advantageous.
proximal tibial defect, internal fixator, bone healing, physiological-like loading
0268-0033
64-72
Duda, Georg N.
ac4e207b-3e2e-4c84-a6c4-cb67531f890b
Mandruzzato, Francesco
46b2611a-07e9-4714-a755-696c142ef9cd
Heller, Markus
3da19d2a-f34d-4ff1-8a34-9b5a7e695829
Kassi, Jean-Pierre
ac35a5d6-9253-43f3-bfca-5587f3fde3ed
Khodadadyan, Cyros
1ae8f296-0d5a-47fd-be26-100073d91de1
Haas, Norbert P.
94a96d7c-e62e-4f46-b2ff-35bb52dc5bd4
Duda, Georg N.
ac4e207b-3e2e-4c84-a6c4-cb67531f890b
Mandruzzato, Francesco
46b2611a-07e9-4714-a755-696c142ef9cd
Heller, Markus
3da19d2a-f34d-4ff1-8a34-9b5a7e695829
Kassi, Jean-Pierre
ac35a5d6-9253-43f3-bfca-5587f3fde3ed
Khodadadyan, Cyros
1ae8f296-0d5a-47fd-be26-100073d91de1
Haas, Norbert P.
94a96d7c-e62e-4f46-b2ff-35bb52dc5bd4

Duda, Georg N., Mandruzzato, Francesco, Heller, Markus, Kassi, Jean-Pierre, Khodadadyan, Cyros and Haas, Norbert P. (2002) Mechanical conditions in the internal stabilization of proximal tibial defects. Clinical Biomechanics, 17 (1), 64-72. (doi:10.1016/S0268-0033(01)00102-4).

Record type: Article

Abstract

Objectives
The goal was to design a method which would permit an assessment of the suitability of a newly developed implant under physiological-like loading conditions. Information obtained from such an analysis is expected to delineate more clearly the indications for a new device prior to clinical utilization.

Design
In vitro mechanical stiffness testing and finite element analysis.

Methods
From in vitro testing of proximal tibiae with defects, the stiffness of an internal stabilization system was determined. Using a finite element model, the loading of both the implant and bone was analyzed including all muscle forces. The variation in implant loading and interfragmentary strain for different defect locations was also investigated.

Results
Conventional stiffness testing demonstrated the comparability of the experimental findings with the finite element predictions. Under physiological-like loading the implant experienced high bending and von Mises stresses if defects in the region of the shaft were stabilized. A short working length increased implant loading up to the yield strength of the material.

Conclusions
The finite element analysis illustrated the appropriateness of this new device for proximal defects of the tibia, but the implant should be used hesitantly in fractures or defects extending into the diaphyseal region of the bone.

Relevance
This new analytical approach helped to identify clinical indications for the implant in which its mechanical attributes would prove advantageous.

Full text not available from this repository.

More information

Published date: January 2002
Additional Information: TY - JOUR
Keywords: proximal tibial defect, internal fixator, bone healing, physiological-like loading
Organisations: Bioengineering Group

Identifiers

Local EPrints ID: 348490
URI: https://eprints.soton.ac.uk/id/eprint/348490
ISSN: 0268-0033
PURE UUID: 78a8aff7-2c53-4897-ac17-9b916f164b6c
ORCID for Markus Heller: ORCID iD orcid.org/0000-0002-7879-1135

Catalogue record

Date deposited: 26 Feb 2013 11:17
Last modified: 01 Oct 2019 00:38

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Contributors

Author: Georg N. Duda
Author: Francesco Mandruzzato
Author: Markus Heller ORCID iD
Author: Jean-Pierre Kassi
Author: Cyros Khodadadyan
Author: Norbert P. Haas

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