Modular hip joint endoprostheses allow for fitting the head size and offset (distance from the centre of the head to the mechanical axis of the prosthesis) with the prosthesis size. This is possible through application of the external lock cone, mainly with dimensions of d = 12, L = 11, D = 14, and the internal cone with the same dimensions in the head. Proper mounting of the head on the stem causes a firm and stable fixation of the head-stem system. It is essential for the analysis of the materials currently used for stems and heads with extremely varied strength parameters that their effect on intensity of wear of the head and stem is also taken into consideration. The examinations were based on the heads made of materials FeCrNiMnMoNbN, 316L, CoCr, Al2O3, ZrO2 which were in contact with stem materials such as Ti6Al4V, CoCrMo, 316L. Based on the components removed from human body, it was demonstrated that the use of prosthesis causes micro-displacements on the contact surfaces of the stem and bone head and wear of these surfaces. Evaluation of wear was carried out based on the analysis of the surface geometrical structure (SGS) of the internal cone in the bone head. For this purpose, the measurements were conducted using GOM ATOS II 3D scanner. The results of the SGS measurements for the internal surface of the heads in contact are presented. The examinations of the artificial joints in modular endoprostheses showed the wear between the surfaces of the stem and head resulting from rotational and axial movements of the head on the stem cone. The magnitude and extent of the wear depend mainly on the patient's weight, intensity of use (physical activity), range of movement in the artificial joint and type of stem and head materials.Keywords: Biomaterials, tribological examinations, destruction of hip joint, modelling and simulation
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