DOI: https://doi.org/10.22141/1608-1706.3.17.2016.75774

Investigation of Stress-Strain State of the Model of the Femur in Terms of Arthroplasty for its Proximal Fractures

O.A. Tiazhelov, V.O. Babalian, A.V. Kalchenko, M.Yu. Karpіnskyi, O.D. Karpіnska, O.V. Yaresko

Abstract


The proportion of fractures of the proximal femur in the elderly is up to 45 % in the structure of all skeletal fractures. Hip replacement in this group of patients helps to achieve functional recovery in the early postoperative period, which can not be achieved when using modern methods of osteosynthesis. Using the finite element method to study stress-strain state of mathematical models of the femur with acetabular fractures of different types at their treatment by endoprosthesis allows you to create three-dimensional models of biological objects and to identify the main trends in the changes of their stress-strain state. Objective: to develop a mathematical model of acetabular hip fractures according to Evans classification and using it to learn the basic directions of loads in the proximal femur during athroplasty with additional fragment fixation by nails. Materials and methods of the study. In laboratory of biomechanics, there were carried out studies using a finite element method for stress-strain state of mathematical models of the femur with acetabular fractures of different types during their treatment by means of implant with fragment fixation by nails, for which we have developed femur models with acetabular fractures according to Evans classification. Modeling was performed using computer-aided design system SolidWorks. Calculations of the stress-strain state of models were made using the software system CosmosM. As a criterion for assessing stress state of models, Mises stress has been used. Results. During arthroplasty, bone tissue in fracture zone is loaded considerably less than implant depending on the type of fracture. Conclusion. In athroplasty, the main load is taken by the metal constructions, which made is possible to unload fracture zone and thereby to prevent secondary displacement of fragments when loading limbs in the early postoperative period.


Keywords


mathematical modeling; final element method; proximal femur; endoprosthetics

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