Cement mantle fatigue failure in total hip replacement: experimental and computational testing


Jeffers, Jonathan R.T., Browne, Martin, Lennon, Alexander B., Prendergast, Patrick J. and Taylor, Mark (2007) Cement mantle fatigue failure in total hip replacement: experimental and computational testing. Journal of Biomechanics, 39, (7), 1525-1533. (doi:10.1016/j.jbiomech.2006.07.029).

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Description/Abstract

One possible loosening mechanism of the femoral component in total hip replacement is fatigue cracking of the cement mantle.
A computational method capable of simulating this process may therefore be a useful tool in the preclinical evaluation of prospective implants. In this study, we investigated the ability of a computational method to predict fatigue cracking in experimental models of the
implanted femur construct. Experimental specimens were fabricated such that cement mantle visualisation was possible throughout the
test. Two different implant surface finishes were considered: grit blasted and polished. Loading was applied to represent level gait for two
million cycles. Computational (finite element) models were generated to the same geometry as the experimental specimens, with residual
stress and porosity simulated in the cement mantle. Cement fatigue and creep were modelled over a simulated two million cycles. For the
polished stem surface finish, the predicted fracture locations in the finite element models closely matched those on the experimental
specimens, and the recorded stem displacements were also comparable. For the grit blasted stem surface finish, no cement
mantle fractures were predicted by the computational method, which was again in agreement with the experimental results. It was
concluded that the computational method was capable of predicting cement mantle fracture and subsequent stem displacement for the
structure considered.

Item Type: Article
ISSNs: 0021-9290 (print)
Related URLs:
Keywords: bone cement, fatigue, finite element, continuum damage mechanics, hip replacement
Subjects: T Technology > TJ Mechanical engineering and machinery
R Medicine > RD Surgery
Q Science > QA Mathematics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Bioengineering Sciences
ePrint ID: 47596
Date Deposited: 02 Aug 2007
Last Modified: 27 Mar 2014 18:31
Contact Email Address: m.taylor@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/47596

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