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Analyse multi-échelle de la durabilité des biocéramiques pour prothèses de hanche. Études in vitro et ex vivo.

Abstract : Because of the excellent biocompatibility and great mechanical properties, bioceramics are the best choice for total hip replacement (THR). When hip is replaced, a microseparation could appear between the head and the cup leading to a shock limiting the lifetime of ceramics. Classic tests on hip simulator partly allow estimating the lifetime of ceramics.Ceramics materials are subjected to shocks. In this work we evaluated the reliability of bioceramics for hip replacement tested in a shock machine. Two bearing surfaces were studied (head/cup): alumina/alumina and composite alumina-zirconia/alumina. Tests were carried out in dry and in solution with an inclination of 45° to respect the standard anatomical position. Femoral heads exhibited two wear stripes of similar location and roughness to those found ex vivo. Shock device reproduces in vivo degradation. The influence of aging on the shocks degradation was also studied for composites alumina-zirconia. Artificial ageing did not affect the shock-induced wear resistance. Further analysis of retrieved composite would be interesting for comparison of experimental results.Also, ex vivo analyses were made. A large number of retrieved zirconia femoral heads were analyzed in order to understand the phase transformation of zirconia in vivo. Any correlation between the phase transformation and the increase in roughness was found. We might suggest that phase transformation is activated during the fabrication process (sintering, polishing, machining) and is not accelerated in vivo.
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Submitted on : Monday, September 24, 2012 - 5:47:13 PM
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Juliana Uribe Perez. Analyse multi-échelle de la durabilité des biocéramiques pour prothèses de hanche. Études in vitro et ex vivo.. Autre. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2012. Français. ⟨NNT : 2012EMSE0642⟩. ⟨tel-00734899⟩

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