METHODOLOGY OF PRECLINICAL CHARACTERISTICS STUDIING THE MOBILITY NODE OF HIP JOINT ENDOPROSTHESES BASED ON MATHEMATICAL MODELING

Background. The relevance of the topic is due to the need for preclinical research of friction pairs of hip endoprostheses, aimed at optimizing the treatment and diagnostic processes of human hip arthroplasty. The aim of the work is to develop and test a methodology for studying the medical and biological processes of functioning of hip endoprostheses, which allows assessing the strength and wear resistance of friction pairs. Materials and methods. The research methodology uses regression mathematical modeling of stresses in the mobility unit of the hip endoprosthesis based on the medical and biological processes of functioning of the hip joint and a comparative test of volumetric wear of friction pairs. Results. The developed simulation and mathematical models of medical and biological processes of functioning of the hip joint made it possible to assess the reliability of the designs of friction pairs made of carbositall alloy. Evaluation of the obtained stress data revealed high reliability of the mobility unit with a friction pair made of carbositall alloy. Volumetric wear of the friction pair made of carbositall-ceramic is 31.8 % less than that of the ceramic friction pair. Conclusions. Mathematical and simulation models allow us to determine the loading parameters of the mobility units of hip endoprostheses. As a result of the study, the safety margin of the friction pair made of carbositall-ceramic was 4.5, which indicates high reliability of the design. Determination of volumetric wear allows us to determine the ability of new friction pairs to reduce the risk of postoperative complications. Volumetric wear of the friction pair made of carbositall-ceramic is 31.8 % less than that of the ceramic friction pair. The data obtained as a result of the study will optimize the treatment and diagnostic process of human hip arthroplasty by providing data on the strength and wear resistance of endoprostheses at the preoperative stage.