Abstract
PMMA is the unique material used currently for fixing prosthesis in bone in cemented arthoplasty. The cement rupture is caused by the accumulation of cracks initiated from micro-defects. In this study, the finite element method is used to analyse the behaviour of a crack emanating from a micro-void, and on the other hand, a crack emanating from a bone inclusion in the cement mantle of hip stem by computing the stress intensity factor (SIF) at the crack tip. Results show that the stress intensity factors for a crack emanating from a bone inclusion is higher than the crack emanating from a micro-void. Therefore, from comparison results, one can note that the risk of crack propagation by opening mode in the distal zone is more important than medial and proximal ones.KeywordsTHABone cementBone inclusionMicro-voidCrackSIFFEM
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