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PL
W niniejszej pracy poruszono problem stabilizacji ukośnie złamanej kości piszczelowej przy wykorzystaniu systemu ZESPOL. W celu zaprezentowania rozkładu naprężeń oraz odkształceń wykonano, przy zastosowaniu metody elementów skończonych model układu stabilizator-kość, który został poddany numerycznej wytrzymałościowej analizie. W modelu została uwzględniona struktura kości zbitej jak i trabekularnej, przy zachowaniu własności ortotropowych. Analizę wytrzymałościową wykonano zarówno dla kości zdrowej jak i osteoporotycznej.
EN
The present work deals with the problem of stabilization of fractured tibia with application of ZESPOL system. In order to present the stress and deformation distribution, a model of the stabilizer-bone system was performed using the finite element method. The model has been subjected to strength analysis. The structure of compact and trabecular bone was incorporated into the model while retaining orthotropic properties. Strength analysis was performed for both the healthy and osteoporotic bone.
2
Content available remote Procedure of generating the individually matched bone scaffolds
EN
The pace of modern life forced continuous high readiness and proper condition of motion systems on human beings. The techniques used in medicine and orthopaedics enable treatment of even highly complicated injuries and pathological states. One of them involves the use of bone scaffolding – the technique being intensively developed, which seems to have a promising future. Based on a numerical modelling, it is possible to match that type of implant to the needs of individual patient, with consideration for both biomechanical factors (patient weight, bone size and its defects) and the applicable implantation techniques. Vast possibilities are offered by the application of the finite element method as a technique enabling verification of an implant with the individually matched geometry and material. The paper presents the procedure aimed at generating the bone scaffold structure that enables the stresses created in the contact places of implant with the surrounding bone tissue to be reduced. High stresses may lead to local damages to the tissue and, in extreme cases, to the destruction of a scaffold. The present procedure is based on the theory of genetic algorithms and, due to several models widely known in biomechanics, allows stresses in places of bone contact with implant to be significantly reduced.
PL
W artykule opisano badania dotyczące przypadku złamanej kości piszczelowej po stabilizacji systemem ZESPOL, który poddano numerycznej analizie wytrzymałościowej. Model sformułowano oraz symulacje numeryczne przeprowadzono w systemie ANSYS.
EN
Numerical strength analysis of broken tibial bone stabilized by system ZESPOL was presented in this paper. The model was created and numerical analysis was carried out using program ANSYS.
EN
The purpose of the research is the estimation of strain distribution in tibia bone. Resultant strain distribution constitutes necessary data for the calculations made in the process of simulation of bone tissue adaptation. Estimation of strain distribution in proximal part of tibia bone is made for different load conditions (including the one following total knee arthroplasty and a surgical correction of lower limb with the application of high tibial osteotomy). The model of tibia bone and soft tissues, prepared for finite element analysis, was made with the use of Ansys 5.6. The geometry of bone was estimated by 3-D digitalisation of a physical model of bone. Displacements distribution obtained from the simulation was compared with the measurements of the physical model of a knee joint. In the research the holographic interferometry method was applied. The results of this calculation are helpful in the estimation of boundary conditions for a simulation of bone tissue functional adaptation in the region of a knee joint. It has been found out that there are differences in strain distribution in different load conditions. However, the perfect agreement of experimental and numerical results for a simple static load indicates that the numerical model is valid for this simulation in a certain range of the applied load.
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