Acta Mechanica Slovaca 2010, 14(4):42-51 | DOI: 10.2478/v10147-011-0033-9

Computational Modeling of the Probability of Destructions in Total Joint Endoprosthesis Ceramic Heads using Weibull's Theory

Přemysl Janíček1, Vladimír Fuis2, Michal Málek2
1 Faculty of Mechanical Engineering, Technical University Bratislava, Slovakia
2 Faculty of Mechanical Engineering, Brno University of Technology

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.

Keywords: Computational Modeling, Ceramic Head, in Vivo Destructions, Hip Joint Endoprosthesis, Probabily of Rupture, Shape Deviations of the Contact Areas, Weibull Theory

Published: October 31, 2010  Show citation

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Janíček, P., Fuis, V., & Málek, M. (2010). Computational Modeling of the Probability of Destructions in Total Joint Endoprosthesis Ceramic Heads using Weibull's Theory. Acta Mechanica Slovaca, 14(4), 42-51. doi: 10.2478/v10147-011-0033-9
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