PMID: 8950663Nov 1, 1996Paper

An analysis of crack propagation paths at implant/bone-cement interfaces

Journal of Biomechanical Engineering
B A McCormack, P J Prendergast

Abstract

Clinical follow-up studies of joint replacements indicate that debonding of the implant from the bone-cement is the first mechanical event of loosening. Debonding can occur due to unsustainable interface stresses, usually initiated from defects along the interface. Such defects, or flaws, are inevitably introduced during the surgical procedure and from polymerisation shrinkage. Debonding leads to increased stresses within the cement mantle. This study is concerned with modelling the propagation of a crack from the debonded region on the cement/implant interface under physiological loading conditions for different implant materials and prosthesis designs. Using the theory of linear fracture mechanics for bimaterial interfaces, the behaviour of a crack along an interface between implant materials, under various states of stress, is studied. Specifically, a model is developed to determine the conditions under which a debonded region, along an otherwise bonded interface, will either propagate along the interface or will "kink" into the cement mantle. The relationship between the stress state and the crack propagation direction at the interface is then predicted for different interface materials, and it is shown that different crack...Continue Reading

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Citations

Nov 14, 2000·Journal of Biomedical Materials Research·X Wang, C M Agrawal
Jun 1, 2000·Journal of Inorganic Biochemistry·R De SantisL Nicolais
Apr 15, 2014·International Journal of Nanomedicine·Morshed KhandakerTracy Morris
May 23, 2003·Journal of Biomedical Materials Research. Part a·Ozan AkkusClare M Rimnac
Oct 20, 2017·American Journal of Speech-language Pathology·Xin Xin Li, Carol K S To
Feb 19, 2002·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·L MontiM Viceconti

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