Analysis of selected roughness parameters describing the degree of surface wear of Weller endoprostheses heads

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Analysis of selected roughness parameters describing the degree of surface wear of Weller endoprostheses heads

Journal Title: Problemy Nauk Stosowanych - Year 2017, Vol 7, Issue

Abstract

Introduction and aims: The results of analysis for surface geometry of Weller endoprosthesis heads removed from the aseptic loosening of artificial hip joint are presented in the paper. A dependence between the values of amplitude parameters and time period of endoprosthesis exploitation are shown in this paper. Moreover the dependence between the various amplitude parameters of analysed heads surface is described in the paper. Material and methods: It was tested the surface of 37 heads of Weller endoprosthesis, which were exploited from 5 to 20 years. Measurements of geometrical structure were realized by using the Rank Taylor Hobson Talyscan 150 apparatus. The scanning region of Weller endoprosthesis heads had the range of 1,5-2,0 mm2 scanning velocity about 5,0 mm/s. Obtained data were saved and analysed by the Talymap 3.0 computing program. Results: The effect of exploitation of Weller endoprosthesis heads refers to decreasing the values of analysed parameters St, Sz, Sa and Sds. That fact means not only the worse work conditions in the wear point “polyethylene cup - head” of Weller endoprosthesis but also early occurring of aseptic loosening in implanted artificial joint. Conclusions: The dependence between the parameters Sds and St, and also between the parameters Sds and Sz showed rather little correlation with decreasing trend [p<0,05]. The relations between the parameters values Sz and St describing the heads surface of Weller endoprosthesis and time period of their exploitation showed some significant decreasing depend-ence [p<0,001]. From comparison of parameters St, Sz and Sds implies that each pair of analysed parameters has negative directly proportional relation.

Authors and Affiliations

Janusz Cwanek, Andrzej Antoni Czajkowski

Keywords

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EP ID EP310275
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