Computational assessment of the effect of polyethylene wear rate, mantle thickness, and porosity on the mechanical failure of the acetabular cement mantle
Computational assessment of the effect of polyethylene wear rate, mantle thickness, and porosity on the mechanical failure of the acetabular cement mantle
Clinical studies have revealed that aseptic loosening is the dominant cause of failure in total hip arthroplasty, particularly for the acetabular component. For a cemented polyethylene cup, failure is generally accompanied by the formation of fibrous tissue at the cement–bone interface. A variety of reasons for the formation of this tissue have been suggested, including osteolysis and mechanical
overload at the cement–bone interface. In this study, a computational cement damage accumulation method was used to investigate the effect of polyethylene cup penetration, cement mantle thickness, and cement porosity on the number of cycles required to achieve mechanical
fatigue failure of the cement mantle. Cup penetration was found to increase cement mantle stresses, resulting in a reduction in cement mantle fatigue life of 9% to 11% for a high cup penetration rate. The effect of using a thin (2 mm) over a thick (4 mm) cement mantle also reduced cement mantle fatigue life between9%and 11%, and greatly raised cancellous bone stresses. Cement porosity was found to have very
little effect on cement mantle fatigue life. Failure modes and cement stresses involved suggest that only extreme combinations of a thin cement mantle and high cup penetration may lead to mechanical failure of the cement mantle, thereby allowing wear debris access to the
cement–bone interface. A thin cement mantle may also lead to the mechanical overload of the cement–bone interface. In this manner, the authors suggest that the mechanical factors may contribute to the failure mode of cemented polyethylene cups.
finite element analysis, bone cement, aseptic loosening, acetabulum, cup penetration
565-570
Coultrup, Oliver J.
b0dde673-7816-4074-925e-3cd15538b787
Hunt, Chris
76bfa9f7-f770-41a8-aeac-dc459df15423
Wroblewski, B. Michael
cfcf9929-67e0-48a3-abdb-209ed4f7325b
Taylor, Mark
e368bda3-6ca5-4178-80e9-41a689badeeb
30 November 2009
Coultrup, Oliver J.
b0dde673-7816-4074-925e-3cd15538b787
Hunt, Chris
76bfa9f7-f770-41a8-aeac-dc459df15423
Wroblewski, B. Michael
cfcf9929-67e0-48a3-abdb-209ed4f7325b
Taylor, Mark
e368bda3-6ca5-4178-80e9-41a689badeeb
Coultrup, Oliver J., Hunt, Chris, Wroblewski, B. Michael and Taylor, Mark
(2009)
Computational assessment of the effect of polyethylene wear rate, mantle thickness, and porosity on the mechanical failure of the acetabular cement mantle.
Journal of Orthopaedic Research, 28 (5), .
(doi:10.1002/jor.21040).
Abstract
Clinical studies have revealed that aseptic loosening is the dominant cause of failure in total hip arthroplasty, particularly for the acetabular component. For a cemented polyethylene cup, failure is generally accompanied by the formation of fibrous tissue at the cement–bone interface. A variety of reasons for the formation of this tissue have been suggested, including osteolysis and mechanical
overload at the cement–bone interface. In this study, a computational cement damage accumulation method was used to investigate the effect of polyethylene cup penetration, cement mantle thickness, and cement porosity on the number of cycles required to achieve mechanical
fatigue failure of the cement mantle. Cup penetration was found to increase cement mantle stresses, resulting in a reduction in cement mantle fatigue life of 9% to 11% for a high cup penetration rate. The effect of using a thin (2 mm) over a thick (4 mm) cement mantle also reduced cement mantle fatigue life between9%and 11%, and greatly raised cancellous bone stresses. Cement porosity was found to have very
little effect on cement mantle fatigue life. Failure modes and cement stresses involved suggest that only extreme combinations of a thin cement mantle and high cup penetration may lead to mechanical failure of the cement mantle, thereby allowing wear debris access to the
cement–bone interface. A thin cement mantle may also lead to the mechanical overload of the cement–bone interface. In this manner, the authors suggest that the mechanical factors may contribute to the failure mode of cemented polyethylene cups.
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Published date: 30 November 2009
Keywords:
finite element analysis, bone cement, aseptic loosening, acetabulum, cup penetration
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Local EPrints ID: 143585
URI: http://eprints.soton.ac.uk/id/eprint/143585
ISSN: 0736-0266
PURE UUID: bdeb2b34-a781-4625-aeaa-0eb9442b1e5b
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Date deposited: 12 Apr 2010 12:21
Last modified: 14 Mar 2024 00:43
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Author:
Oliver J. Coultrup
Author:
Chris Hunt
Author:
B. Michael Wroblewski
Author:
Mark Taylor
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