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Stress-strain analysis of cementless femoral stem in total hip arhtroplasty
Čáp, Lukáš ; Borák, Libor (referee) ; Marcián, Petr (advisor)
This master thesis focuses on the issues related to uncemented total hip replacements. The long-term functionality of uncemented implants is significantly influenced by their postoperative (primary) stability. This thesis analysed the influence of the placement of the implanted stem in the femur and the density of the cancellous bone tissue on the strain – stress states of the total hip arthroplasty system during primary stability. Computational modelling using the finite element method was used for the analysis. First, selected sections of anatomy and hip replacements were presented. Then, a literature review related to the solution and evaluation of strain-stress states was made. The total deformation of the system, the equivalent stress according to the HMH criterion in the stem, the overloading of bone tissues according to Frost's hypothesis, and the relative displacement between the stem and bone tissues were analysed for the options of the computational models. The density of the cancellous bone tissue and the method of stem placement affected the magnitude of these variables. The option in which the stem was most in contact with the compact bone tissue resulted in the least overloading of the cancellous bone tissue. The density of the cancellous bone tissue significantly influenced not only its overloading but also the relative displacement between the stem and the bone tissue.
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Stress strain analysis of hip femoral stems
Čáp, Lukáš ; Thomková, Barbora (referee) ; Marcián, Petr (advisor)
This bachelor thesis is focused on stress and strain analysis of hip femoral stems used in total hip arthroplasty. At the beginning of the work, there is a description of hip joint anatomy, the nomenclature of individual parts of the implant, and hip stem division by type of fixation in bone, material, etc. The next part is devoted to the standards, by which are hip stems invented and manufactured. One part of hip stem development is testing either with the use of test equipment or with the use of computation modeling. For supplied hip stems there is made stress and strain analysis, according to the standards and studies which are focused on this problem. Hip stem geometry creation, setting boundary conditions, and evaluation of the results of the analysis are the content of the calculation part of this work. With these results and analysis, it is possible to compare hip stems between one and the other and decide which one of them is the most or the least statically stressed.
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Stress strain analysis of hip femoral stems
Čáp, Lukáš ; Thomková, Barbora (referee) ; Marcián, Petr (advisor)
This bachelor thesis is focused on stress and strain analysis of hip femoral stems used in total hip arthroplasty. At the beginning of the work, there is a description of hip joint anatomy, the nomenclature of individual parts of the implant, and hip stem division by type of fixation in bone, material, etc. The next part is devoted to the standards, by which are hip stems invented and manufactured. One part of hip stem development is testing either with the use of test equipment or with the use of computation modeling. For supplied hip stems there is made stress and strain analysis, according to the standards and studies which are focused on this problem. Hip stem geometry creation, setting boundary conditions, and evaluation of the results of the analysis are the content of the calculation part of this work. With these results and analysis, it is possible to compare hip stems between one and the other and decide which one of them is the most or the least statically stressed.
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Contemporary landscape changes in the Czech Republic: Case of Jenštejn village
Čáp, Lukáš ; Lapka, Miloslav (advisor) ; Bartoš, Michael (referee)
Diplomová práce Lukáš Čáp Contemporary landscape changes in the Czech Republic: Case of Jenštejn village Abstrakt: The diploma thesis addresses cultural landscape and the various approaches to studying this phenomenon. In the first part of the thesis, the author deals with both Czech and foreign traditions of thought, distinguishing between restitutive and reductionist approaches to the study of cultural landscape. This distinction continues throughout the essay and the potential benefits of each approach are considered in relation to every subject. The first part mainly focuses on the perception of cultural landscape as existential space, drawing on the definition given by Christian Norberg-Schulz in his book Genius Loci. The second part of the thesis examines Carl Ortwin Sauer's concept of cultural landscape. Sauer emphasizes the role of man as an active creator of his surroundings and sees cultural landscape as a consequence of a certain cultural group's activity. The author attempts to verify Sauer's methodology by analyzing the development and key changes of Jenštejn municipality over the course of the last 25-30 years. The research aimed to connect the geographical approach to studying landscape, represented by C. O. Sauer, with the approach focusing on values and symbols that represent people's...
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