Computational modeling of the probability of destructions in total joint endoprosthesis ceramic heads using Weibull's theory

0363667 - ÚT 2012 RIV SK eng J - Journal Article
Janíček, P. - Fuis, Vladimír - Málek, M.
Computational modeling of the probability of destructions in total joint endoprosthesis ceramic heads using Weibull's theory.
Acta Mechanica Slovaka. Roč. 14, č. 4 (2010), s. 42-51. ISSN 1335-2393
Institutional research plan: CEZ:AV0Z20760514
Keywords : computational modeling * ceramic head * in vivo destructions * hip joint endoprosthesis * probabily of rupture
Subject RIV: BO - Biophysics

This report deals with the issue of finding causes of ceramic heads in vivo destructions in total joint endoprostheses. It has been identified that the head fractures were caused by improper mutual geometry tolerances in the taper joint between the ceramic head and the metal stem. This fact was revealed by the results of deformation-stress analyses of heads with various geometric imperfections in the taper contact with the stem using FEM. The issue was further elaborated in the sense of determination of probability of head destruction by existing shape macro-deviations of the taper contact surface of the head and stem, such as varying taper ratio and ovality, taking into consideration micro-roughness from splinter machining of the surfaces of the internal taper of head and the external taper of stem. To estimate the probability of head destruction, we used weakest link Weibull's theory.
Permanent Link: http://hdl.handle.net/11104/0199393