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Distribution and number of wear debris particles around jouint replacements
Veselý, Filip ; Sosna, Antonín (advisor) ; Zima, Tomáš (referee) ; Koudela, Karel (referee)
Aseptic loosening due to polyethylene wear presents one of the most frequently occurring joint replacement complications requiring a revision surgery. Numerous scientific works and publications deal with the issue of morphology, determination and distribution of wear particles. Few studies, however, determine reliably amounts of particles in individual periprosthetic zones. The objective of this work was to evaluate the correlation between amounts of wear particles and periprosthetic osteolysis findings. Description of distribution of these particles in the surroundings of joint replacement presented further objectives of the work. Wear particles were isolated from granuloma obtained during revisions of total hip replacements. Amounts of wear particles were determined using IRc. These findings were correlated with X-ray examinations and intraoperative findings. Method of progressive enzymatic degradation of tissue was used in order to describe wear particles distribution in polyethylene granuloma and surrounding periprosthetic tissues. Results showed uneven incidence of wear particles in the surroundings of the total joint replacement. The incidence correlated with X-ray examinations and intraoperative findings. Distribution of particles was described as well as new determination methods and further...
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A review of hip joint replacements in terms of wear
Vaverka, Pavel ; Ficza, Ildikó (referee) ; Nečas, David (advisor)
This bachelor thesis provides an overview of influence of materials, diametral clearance and head diameter on wear of total hip replacement. First part of the thesis deals evolution of hip joint replacements. Wear measurement methods and commercially available hip joint simulators are described in the following chapter. The main part of this thesis is analysis of important studies dealing with influence of hip replacement design on volumetric wear.
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An experimental investigation of friction coefficient in hip joint replacements
Tkadlec, Tadeáš ; Urban, Filip (referee) ; Nečas, David (advisor)
This bachelor thesis deals with an experimental analysis of friction coefficient within hip joint replacements. The measurements were realized on Mini Traction Machine device in ball-on-disc configuration. The main goal was to determine the effect of implant material, kinematic conditions and model synovial fluid composition on the development of coefficient of friction as a function of time. For this purpose, three different materials (metal, ceramic, polymer), two mean speeds (5.7 mm/s; 22m/s), three different slide-to-roll ratios (SRR = 0 %, SRR = -150 %; SRR = 150 %) and six various model fluids containing albumin and -globulin in a various ratios and concentrations were employed. The results are evaluated in the form of graphs showing the dependence of friction coefficient on time and are confronted with previously published studies.
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Study of Friction in Hip Joint Replacements
Balounová, Hana ; Dzimko, Marián (referee) ; Vrbka, Martin (advisor)
Diploma thesis deals with analysis of coefficient of friction in total hip prosthesis for several materials bearing with presence of bovine serum as substitute of synovial fluid occurred in natural joint. Behavior of coefficient of friction is observed on Mini Traction Machine. Results are plotted at graphs representing dependence of coefficient of friction on time. There are described effects of several kinematic conditions, the influence of used material and the effect of the method of contact lubrication. The experiments analyze how the formation of lubricant film with a layer of adsorbed protein affects coefficient of friction.
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