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Applied Bionics and Biomechanics
Volume 11 (2014), Issue 3, Pages 135-147
http://dx.doi.org/10.3233/ABB-140097

3D Crack Behavior in the Orthopedic Cement Mantle of a Total Hip Replacement

Abderahmen Sahli,1 Smail Benbarek,1 Steven Wayne,2 Bel-Abbes Bachir Bouiadjra,1 and Boualem Serier1

1Mechanics and Physics of Materials Laboratory, University of Sidi Bel Abbes, Cité Ben M'hidi, Sidi Bel Abbes, Algeria
2University of Memphis, TN, USA

Copyright © 2014 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The total hip replacement is an operation that replaces a diseased hip with a mechanical articulation. Both components of the mechanical articulation (stem and the cup) are bonded to bone using orthopedic cement, whose reliability determines the longevity of the implant. The cement around the metallic stem forms a mantle whose strength and toughness determine its resistance to fatigue and failure by fracture. Typical cements are acrylic polymers that often suffer from internal cracks and other defects created during polymerization. This study is a systematic analysis of preexisting 3D crack behavior in the orthopedic cement mantle when subjected to external body forces. Different crack orientations and angular positions around the mantle are studied to identify which locations will propagate the crack. This is accomplished by a global stress analysis of the mantle followed by a failure analysis. Amongst others, the existence of a crack in the proximal region of the orthopedic cement is identified as a critical area, especially in the lateral sides of the stem in the radial direction.