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Surface structures of implants produced by 3D printing
Koutný, Michael ; Rebenda, David (referee) ; Ranuša, Matúš (advisor)
The additive technology is currently also used in endoprosthetics, in which the damaged or diseased part of the joint is replaced with artificial endoprosthesis implants. The problem lies in the spaces of articulating surfaces, where microstructures created by manufacturing can affect tribological properties. This work is concerned with assessing the effect of microstructure defects on the surface of endoprostheses, with an assessment of lubrication and friction properties at the points of contact using a reciprocal tribometer and an optical profilometer. Additively manufactured Ti6Al4V titanium alloy samples with different microstructures were tested, observing the size and number of albumin and globulin from high-speed camera recordings. The results obtained were further compared with texturing. The results obtained can be used as a basis for subsequent studies.
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Laser treatment of the surfaces of small human joints
Křístek, Mikuláš ; Odehnal, Lukáš (referee) ; Ranuša, Matúš (advisor)
Nowadays, in osteoarthritis of small joints, total endoprostheses are used to ensure physiological movement; unfortunately, the durability of these joint implants is very limited. The most frequent wear occurs in the contact area of the implants with the articulating surface. The use of microtextures appears to be beneficial in influencing tribological properties, but this issue is not well described. This bachelor thesis investigates the effect of different microtextures on the coefficient of friction, the movement of proteins in the synovial fluid in the contact area, wear, and the surface topography. Measurements were made using a reciprocal tribometer, optical profilometry and fluorescence observation. The textured samples achieved an increase in the coefficient of friction in the contact region. The results show that surface texturing can significantly affect the coefficient of friction in the contact region, which contributes to the reduction of wear and extension of endoprosthesis life.
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Impact of joint implant surface structure on friction behaviour
Kučera, Ondřej ; Nečas, David (referee) ; Ranuša, Matúš (advisor)
In osteoarthritis of small joints, the use of total endoprosthesis is currently being developed to ensure physiological movement, but it provides only a limited-service life. The use of microstructures on the implant surface may improve tribological properties, but this issue is not described enough. Thus, this work addresses the impact of microstructures on friction coefficient, lubricant thickness in the contact area, wear, as well as surface topography and geometry of the structures. Furthermore, the influence of DLyte electrochemical machining on the change of microstructures geometry and tribological properties is investigated. Measurements were performed using a reciprocal tribometer, interferometry and optical profilometry. The textured samples achieved an increase in both friction coefficient and lubricant thickness in the contact area. Furthermore, a correlation between the height of the texture edges and the measured lubricant thickness was demonstrated. DLyte significantly reduces these edges, also reducing wear, however, it degrades the surface of the CoCrMo samples. Implant texturing can lead to reduced wear, prolonged life, and thus improved quality of life for many patients. Texturing of Ti6Al4V alloy in combination with DLyte shows great potential.
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Development of the first metatarsophalangeal joint replacement
Barták, Vladislav ; Popelka, Stanislav (advisor) ; Stehlík, Jiří (referee) ; Krbec, Martin (referee)
The work provides a comprehensive overview of the issues hallux rigidus with a focus on the first metatarsophalangeal joint replacement and development of our own implant. The development was built to perform anatomical studies, the results were the basis for the construction of hemiarthroplasty and total arthroplasty. It was necessary to measure the marrow cavities of the distal part of first metatarsal and proximal half of proximal phalanx. We measured the size of the metatarsal head in two planes, and its tendency to diaphysis on the dry preparations. Through these studies we obtained valid data for the construction all components of both hemiarthroplasty and total arthroplasty of specifying the size spectrum. We have verified and then corrected the shape of implant treatment during post-mortem tests on the models. The result is a new type of arthroplasty with their own design to guarantee restoration of joint function and coated with a high osteointegral potential. In clinical studies, we performed 22 implantations of hemiarthroplasty and one implantation of total arthroplasty. Clinical results suggest the fact that the implant will be successful. However the ultimate answer to this question will provide long-term study. The other results presented with a detailed anatomical description show to...
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Development of the first metatarsophalangeal joint replacement
Barták, Vladislav ; Popelka, Stanislav (advisor) ; Stehlík, Jiří (referee) ; Krbec, Martin (referee)
The work provides a comprehensive overview of the issues hallux rigidus with a focus on the first metatarsophalangeal joint replacement and development of our own implant. The development was built to perform anatomical studies, the results were the basis for the construction of hemiarthroplasty and total arthroplasty. It was necessary to measure the marrow cavities of the distal part of first metatarsal and proximal half of proximal phalanx. We measured the size of the metatarsal head in two planes, and its tendency to diaphysis on the dry preparations. Through these studies we obtained valid data for the construction all components of both hemiarthroplasty and total arthroplasty of specifying the size spectrum. We have verified and then corrected the shape of implant treatment during post-mortem tests on the models. The result is a new type of arthroplasty with their own design to guarantee restoration of joint function and coated with a high osteointegral potential. In clinical studies, we performed 22 implantations of hemiarthroplasty and one implantation of total arthroplasty. Clinical results suggest the fact that the implant will be successful. However the ultimate answer to this question will provide long-term study. The other results presented with a detailed anatomical description show to...
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