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Stress-Strain Analysis of Plate for Fixing Proximal Tibial Fracture
Votava, Tomáš ; Chamrad, Jakub (referee) ; Marcián, Petr (advisor)
This master thesis is focused on stress-strain analysis of tibia with fixed proximal tibial fracture. Two types of fixation were considered, for each one two variants of solution were made. In the first part of this theses is presented a review of available literature connected with stress-strain analysis of tibia with fixed proximal tibia fracture. Next one is presented a research study of anatomy and biomechanics focused on lower limb. In the last part of research part are presented proximal tibial fractures and way of their fixation. Computational modeling using finite element method was used as solution method of stress-strain states. ANSYS software was used for solution. Total displacement, contanct pressure between femoral articular surface and meniscus, stress on plate and screws and strain in tibial bone tissue were analysed. Assesment of bone tissue state was made on the basis of Frost's hypothesis.
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BIOMECHANICAL STUDY OF EXTERNAL FIXATORS APPLIED TO TIBIA
Mrázek, Michal ; Horyl, Petr (referee) ; Janíček, Přemysl (referee) ; Florian, Zdeněk (advisor)
External fixators are used in a treatment of complicated fractures and their properties have a crucial impact on treatment quality. Therefore, this thesis is concerned with a biomechanical study of a bone (tibia) with applied external fixators via strain-stress analysis and their comparison with a state of tibia without applied fixator (physiological state). After creating the volume models of geometry of tibia and seven variants of external axial fixators, the corresponding finite element method (FEM) models are created. The analysis of tibia without applied fixator and tibia with all studied fixators is made for three states of load which correspond to characteristic load states during the first stage of treatment. The strain-stress analysis is made using finite element method. Furthermore, the methods of displacement and rotation evaluation during loading are proposed. One can conclude from the results of the strain-stress analysis how the different variants of fixators prevent the displacement and rotation of the bone during the different load states and the comparisons with the physiological state of bone are made. Bone tissue loading is determined from the distribution and the values of the first and the third principal stresses. Finally, comparing the results of all variants the influence of the fixator length, the gap between the fixation elements near the fracture, the number and the setting of the fixation elements on the fixation properties is analysed.
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Stress - strain analysis of inferios limb with fixator type Orthofix
Mrázek, Michal ; Fuis, Vladimír (referee) ; Florian, Zdeněk (advisor)
This diploma thesis aims to create a stress strain analysis of Orthofix external fixator applied to lower limb. The introduction summarizes the background research in available scientific publications, targetting the alternatives of treatment, namely application and fixation solutions of long bones. Furthermore parametric models of the fixator and tibia are created in CAD system CATIA. The fixator model enables to create different geometric variations simulating possible fixator settings and moment load in the range of 1-10 Nm. These geometric and loading states of fixator are solved via FEM in ANSYS. Single versions of the states of Orthofix fixator are then subjected to the stress strain analysis.
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Stress-Strain Analysis of Plate for Fixing a Tibial Fracture Type I per Schatzer's Classification
Filková, Alena ; Valášek, Jiří (referee) ; Marcián, Petr (advisor)
Fractures of the proximal tibia are the most severe intra-articular fractures with subsequent frequent complications. In most cases, the fracture is treated with an inner plate or screws. This diploma thesis focuses on the stress-strain analysis of the plate fixed in the tibia using bone screws. Computational modeling using the finite element method was used to assess the mechanical interaction between the individual elements of this system. For this purpose, it was necessary to conduct a research study dealing with issues involving bone tissue, their damage and subsequent treatment of fractures. Stress-strain analysis was performed for two variants of fixation of this fracture: fixation with an angularly stable plate with screws and fixation with compression lag screws. Furthermore, these analyses were supplemented by their modifications, which represented different levels of these two variants of the computational model. Screws for fixing the plate in the bone tissue were considered both threaded and unthreaded. The interface between the screws and the bone tissue was solved using the Bonded contact and also the Frictionless contact. The influence of these modifications of the computational model on the resulting deformation and stress characteristics was assessed in the evaluation of the results. The mechanical interaction between the elements of this system was assessed in all performed variants.
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Estimation of mechanical properties of the cancellous bone tissue of the proximal tibia
Leinweber, Vít ; Valášek, Jiří (referee) ; Marcián, Petr (advisor)
This bachelor thesis is focused on the determination of mechanical properties of cancellous bone tissue of proximal tibia. In the beginning of the work there is theoretical part which consists of a description of the tibia anatomy from macroscopic and microscopic view, treatise on the bone tissue growth, influences affecting the bone tissue growth and description of mechanical properties of the bone tissue. In the end of the theoretical part there is a detailed review of related literature to this work. In the practical part morphometric parameters are measured using software ImageJ and plugin BoneJ. The process of creating a computational model is described and results of mechanical properties are presented. Regression models of mechanical properties and histomorphometric parameters are created from these results.
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A case study of physiotherapeutic treatment of a patient after osteosynthesis of the tibia.
Korčáková, Klára ; Kočí, Gabriela (advisor) ; Mazancová, Iva (referee)
Author: Klára Korčáková Title: A case study of physiotherapeutic treatment of a patient after osteosynthesis of the tibia. Objectives: The aim of the thesis is to create a theoretical background on fracture of fibula and tibial osteosynthesis as a part of the theoretical framework. The special part focuses on establishing a case report of a patient with this diagnosis. Methods: The special part of this bachelor thesis was created during continuous one-month practice at Medicentrum Praha from January 9th to February 3rd , 2023. Based on the patient's medical history and initial examination, goals of therapy were established and 10 therapeutic sessions were conducted, concluded with an exit examination and assessment of the effectiveness of performed therapy. Results: In the general part of the thesis, crucial theoretical background was processed, and in the specific part, improvements were achieved in most of the measured values. Keywords: tibia, fraction of tibia, physiotherapy
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Stress-Strain Analysis of Plate for Fixing a Tibial Fracture Type I per Schatzer's Classification
Filková, Alena ; Valášek, Jiří (referee) ; Marcián, Petr (advisor)
Fractures of the proximal tibia are the most severe intra-articular fractures with subsequent frequent complications. In most cases, the fracture is treated with an inner plate or screws. This diploma thesis focuses on the stress-strain analysis of the plate fixed in the tibia using bone screws. Computational modeling using the finite element method was used to assess the mechanical interaction between the individual elements of this system. For this purpose, it was necessary to conduct a research study dealing with issues involving bone tissue, their damage and subsequent treatment of fractures. Stress-strain analysis was performed for two variants of fixation of this fracture: fixation with an angularly stable plate with screws and fixation with compression lag screws. Furthermore, these analyses were supplemented by their modifications, which represented different levels of these two variants of the computational model. Screws for fixing the plate in the bone tissue were considered both threaded and unthreaded. The interface between the screws and the bone tissue was solved using the Bonded contact and also the Frictionless contact. The influence of these modifications of the computational model on the resulting deformation and stress characteristics was assessed in the evaluation of the results. The mechanical interaction between the elements of this system was assessed in all performed variants.
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Stress-Strain Analysis of Plate for Fixing Proximal Tibial Fracture
Votava, Tomáš ; Chamrad, Jakub (referee) ; Marcián, Petr (advisor)
This master thesis is focused on stress-strain analysis of tibia with fixed proximal tibial fracture. Two types of fixation were considered, for each one two variants of solution were made. In the first part of this theses is presented a review of available literature connected with stress-strain analysis of tibia with fixed proximal tibia fracture. Next one is presented a research study of anatomy and biomechanics focused on lower limb. In the last part of research part are presented proximal tibial fractures and way of their fixation. Computational modeling using finite element method was used as solution method of stress-strain states. ANSYS software was used for solution. Total displacement, contanct pressure between femoral articular surface and meniscus, stress on plate and screws and strain in tibial bone tissue were analysed. Assesment of bone tissue state was made on the basis of Frost's hypothesis.
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The influence of physiologically controlled motor activity on biomechanical cross-section properties of long bones.
Jindrová, Alena ; Sládek, Vladimír (advisor) ; Špoutil, František (referee)
The mechanical loading affects the long bone cross-section geometry (CSG). The aim of this thesis was to examine experimentally the relationship between the locomotory parameters and cross-sectional properties of long bones, and to test some partial knowledge of the bone mechanical adaptation. Two groups of B6CBA mice were examined: (a) Lurcher type (model of olivocerebellar degeneration; n = 10) and (b) control (normal mice; n = 10). We analyzed the motor characteristics and the bone cross-sectional geometric properties. The motor tests included the test of spontaneous motor activity (Open field), strength properties (horizontal bar) and motor coordination (rotarod). Cross-sections were taken in 50 % of the left tibia biomechanical length and further processed for fluorescence confocal microscopy. We analyzed the biomechanical properties of cortical bone cross-sections (software ImageJ). There were nonsignificant differences in CSG parameters (TA, CA, Imax, Imin, J, Imax/Imin) between Lurcher and control mice. The results did not support our assumption about the effect of motor disorder on CSG properties. We did not demonstrate the effect of local factors on the bone biomechanical adaptation. The results of this thesis may be useful to find new testing possibilities of cortical bone in...
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