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Vliv cervikokapitalní endoprotézy na změny napjatosti v kostní tkáni
Kytýř, Daniel ; Micka, Michal
The most common problem that may happen soon after hip hemiarthroplasty surgery is migration of the head of the acetabulumreplacement. In the operation records of the Orthopaedic Clinic of the 3rd Faculty of Medicine of the Charles University in Prague, the implants that migrated in different ways in the course of several months were retrieved and evaluated. There are two dominant directions of the replacement head migration: median migration into pelvis minor or migration in acetabular labrum direction. The aim of this research work is to analyse the migration of the replacement head in pelvic bone under various types of loading and shapes of acetabulum.
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Creation of the helmet model from the 3D scanning
Micka, Michal ; Vyčichl, J.
Contribution deals with the preparation of the numerical model of the cycling protective helmet for calculation with the computer programme ANSYS. The helmet was scanning by the hand scanner. After evaluation of the pictures of the helmet surface are at disposal the graphic output files in the format IGES and STL . To unloaded them and for the creation of the numerical geometrical model in ANSYS the modification of the model was performed in two ways. First the input file is edited from the format IGES and second it is the creation of the helmet outside surface from triangles inscribed into the surface of the model in format STL.
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Droptest of the model of the helmet and head
Micka, Michal ; Krumphanzl, V.
The contribution deals with the evaluation of the behavior of the numerical model of the bike helmet and the head maquette using the programme ANSYS LS-DYNA. There are collated two types of the protective helmet – fulfilled helmet and the helmet with lightening and airing openings. There are modeled the fall on the pillow in both cases with the same initial parameters and the results of both calculations are collated.
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Vliv tvaru pánevní kosti na pole napění po implantaci cerkvikokapitální endoprotézy
Kytýř, Daniel ; Jírová, Jitka ; Micka, Michal ; Jíra, J.
Migration of the implant head after hemiarthoplasty is a problem which appertain to nearly all patients. Article deals with development and utilization of parametrical FE model of the hip joint for numerical analysis of implant head migration. There are two main input parameters for the stress analysis. CE angle representing the shape of acetabulum and direction of the femoral replacement loading. To assess the influence of selected parameters on the implant migration and to enable easy comparison to patients X-Ray scanning, the analysis was carried out as axially symmetric 2D and 3D contact problem. Ultimate values of first principal stress, third principal stress and sum of displacements were used as a reference magnitude.
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