Mathematical Modeling of a Plate for Fixation of Periprosthetic Fractures of the Proximal Femur

Amanzhol Balgazarov, Arman Batpen, Serik Sabirzhanovich Balgazarov, Boris Gorbunov

2024

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DOI 10.52889/1684-9280-2024-3-74-4-9
Data confidence 70 medium
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Abstract

Periprosthetic fractures of the proximal femur pose a significant medico-social problem, as their treatment is complicated by the presence of a prosthetic stem in the medullary canal, which makes fragment fixation difficult and determines the stability of the prosthesis. According to the expert group of the World Health Organization, up to 1 million 500 thousand total hip replacements are performed annually in the world. According to various data, the prevalence of periprosthetic femoral fractures varies over a wide range - from 0.1 to 46.0%, which is a significant medical and social problem. he main problem in the treatment of periprosthetic fractures is the presence of a prosthetic leg in the bone marrow canal, which makes it difficult to fix fragments and determines the stability of the prosthesis leg.The purpose of this study to conduct mathematical modeling of a domestically developed plate for use in fixing periprosthetic fractures of the proximal femur.Materials and methods. The examination of the plate for fixation of periprosthetic fractures of the proximal femur was carried out using the finite element method. For the computer implementation of the FEM, there were used COMPASS-3D, Autodesk Inventor PRO and SolidWorks programs. The physical and mechanical parameters of the system components taken from the references data were used for calculations.Results. The performed the stress-strain state calculations showed that the magnitude of stresses arising under the influence of a load does not exceed the strength limit of the plate material 900-1100 MPa, the greatest stresses in the periprosthetic plate occurring in the area of the holes of the locking screws and side paired holes, it also does not exceed the permissible strength values and is 56.48 MPa.Conclusion. According to the results of the conducted studies, it can be concluded that there is a sufficient margin of safety of the periprosthetic plate for fixing periprosthetic fractures of the proximal femur and of the system «femur – endoprosthesis – periprosthetic plate» as a whole.