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Master's Thesis
Author of thesis: Ing. Klára Ostratická
Acad. year: 2025/2026
Supervisor: Ing. Petr Marcián, Ph.D.
Reviewer: Ing. Jiří Valášek, Ph.D.
This thesis deals with the stress–strain analysis of lumbar interbody fusion. This surgical procedure is performed in cases of lumbar spine disorders, where the intervertebral disc is removed and replaced with an implant. As a result, two or more lumbar vertebrae are permanently fused. At the beginning of the thesis, a literature review was conducted describing different approaches to lumbar interbody fusion and the fixation systems used. The main focus of the work is a stress–strain analysis performed using a computational model based on the Finite Element Method in Ansys Workbench 2025 R2. A geometrical model was created based on real CT data of a patient. The model consists of six spinal vertebrae and the sacrum (Th12–S5), intervertebral discs, cartilage, ligaments, an intervertebral cage replacing the disc between the L4 and L5 vertebrae, and four bone screws. Two computational models were compared: a physiological model and a model with an implanted fixation system, from which the geometry for a submodel was subsequently created. The model was loaded with a gravitational force of 500 N, and frictional contact were defined at the articular cartilage surfaces to ensure more realistic behaviour of the entire system. Based on the analysis of lumbar interbody fusion, the total deformation of the system, the strain in trabecular bone according to Frost’s hypothesis, and the reduced (von Mises) stress in the individual fixation components were evaluated. The obtained stress values were compared with the yield strength, and the factor of safety was determined.
Lumbar interbody fusion, intervertebral discs, lumbar spine, interbody cage, Finite Element Method, ligaments, cartilage, stress–strain analysis
Date of defence
08.06.2026
Result of the defence
Defended (thesis was successfully defended)
Grading
A
Process of defence
Studentka ve vymezeném čase prezentovala svoji závěrečnou práci. Následně byly přečteny posudky vedoucího a oponenta spolu s přiloženými dotazy k závěrečné práci, které byly studentkou zodpovězeny. Po zodpovězení doplňujících dotazů bylo přistoupeno k odborné rozpravě. Jak bylo určeno ohraničení zátěžných sil na výběžcích, a je taková interpretace reálná? Proč jsou zatížené? Jak byla zvolena síla 500N a není to moc? Po zodpovězení všech dotazů bylo vystoupení hodnoceno jako: A- Výborně.
Language of thesis
Czech
Faculty
Fakulta strojního inženýrství
Department
Institute of Solid Mechanics, Mechatronics and Biomechanics
Study programme
Engineering Mechanics and Biomechanics (N-IMB-P)
Specialization
Biomechanics (BIO)
Composition of Committee
prof. Ing. Jan Vimmr, Ph.D. (předseda) prof. Ing. Luboš Náhlík, Ph.D. (místopředseda) prof. Ing. Jindřich Petruška, CSc. (člen) prof. Ing. Jiří Burša, Ph.D. (člen) prof. RNDr. Michal Kotoul, DrSc. (člen) doc. Ing. Zdeněk Florian, CSc. (člen) prof. RNDr. Matej Daniel, Ph.D. (člen) Ing. László Iván, Ph.D. (člen) doc. Ing. Tomáš Návrat, Ph.D. (člen)
Supervisor’s reportIng. Petr Marcián, Ph.D.
Grade proposed by supervisor: A
Reviewer’s reportIng. Jiří Valášek, Ph.D.
Grade proposed by reviewer: B
Responsibility: Mgr. et Mgr. Hana Odstrčilová