RT Journal Article
SR Electronic
A1 Janíček, Přemysl
A1 Fuis, Vladimír
A1 Málek, Michal
T1 Computational Modeling of the Probability of Destructions in Total Joint Endoprosthesis Ceramic Heads using Weibull's Theory
JF Acta Mechanica Slovaca
YR 2010
VO 14
IS 4
SP 42
OP 51
DO 10.2478/v10147-011-0033-9
UL https://www.actamechanica.sk/artkey/ams-201004-0005.php
AB This report deals with the issue of finding causes of ceramic heads 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.