@article{MTMT:33954066,
	title = {Extended mechanical loads for the analysis of acetabular cages},
	url = {https://m2.mtmt.hu/api/publication/33954066},
	author = {Dóczi, Martin and Sződy, Róbert and Zwierczyk, Péter},
	doi = {10.1007/s10237-023-01728-z},
	journal-iso = {BIOMECH MODEL MECHAN},
	journal = {BIOMECHANICS AND MODELING IN MECHANOBIOLOGY},
	volume = {22},
	unique-id = {33954066},
	issn = {1617-7959},
	abstract = {To analyse the strength and mechanical behaviour of hip implants, it is essential to employ an appropriate loading model. Generating computational models supplemented with muscle forces is a complicated task, especially in the initial phase of implant development. This research aims to expand the possibilities of the simpler acetabular cage model based on joint loads without significantly increasing the demand for computing resources. A Python script covered and grouped the loads from daily activities. The ten calculated major loads were compared with the maximum of the walking and stair climbing loads through the finite element analyses of a custom-made acetabular cage. Sensitivity analyses were performed for the surrounding bones’ elastic modulus and the pelvis boundary conditions. The major loads can geometrically cover the entire load spectrum of daily activities. The effect of many high-magnitude force vectors is uncertain in the approach that uses the most common maximum loads. Using these resultant major loads, a new stress concentration area could be detected on the acetabular cage, besides the stress concentration areas induced by the loads reported in the literature. The qualitative correctness of the results is also supported by a control computed tomography scan: a fracture occurred in an extensive, high-stress zone. The results are not sensitive to changes in the elastic modulus of the surrounding bone and the boundary conditions of the model. The presented load vectors and the algorithm make more extensive static analyses possible with little computational overhead. The proposed method can be used for checking the static strength of similar implants.},
	year = {2023},
	eissn = {1617-7940},
	pages = {1411-1423},
	orcid-numbers = {Sződy, Róbert/0000-0002-0856-1772; Zwierczyk, Péter/0000-0002-5431-1782}
}

@article{MTMT:33785140,
	title = {Equivalent loads from the life-cycle of acetabular cages in relation to bone-graft transformation},
	url = {https://m2.mtmt.hu/api/publication/33785140},
	author = {Dóczi, Martin and Sződy, Róbert and Zwierczyk, Péter},
	doi = {10.1016/j.cmpb.2023.107564},
	journal-iso = {COMPUT METH PROG BIO},
	journal = {COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE},
	volume = {236},
	unique-id = {33785140},
	issn = {0169-2607},
	year = {2023},
	eissn = {1872-7565},
	orcid-numbers = {Sződy, Róbert/0000-0002-0856-1772; Zwierczyk, Péter/0000-0002-5431-1782}
}

@article{MTMT:33056354,
	title = {Effect of the Design Constraints and the Loading Model on the Geometry of Topology Optimized Acetabular Cages},
	url = {https://m2.mtmt.hu/api/publication/33056354},
	author = {Dóczi, Martin and Sződy, Róbert and Zwierczyk, Péter},
	doi = {10.3311/PPme.20238},
	journal-iso = {PERIOD POLYTECH MECH ENG},
	journal = {PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING},
	volume = {66},
	unique-id = {33056354},
	issn = {0324-6051},
	abstract = {The treatment of large acetabular bone defects is a challenging task for the clinical experts. One of the most important part is the selection or the design the most appropriate implant. The aim of the study is to explore the potential of topology optimization for the treatment of extensive pelvic bone defects. Using a finite element method, the authors investigate different design spaces and load cases. Sensitivity tests for the material characteristic of the bone and the constraint of the applied volume-fraction were performed. The results are topology-optimized acetabular cage concepts with similar designs. The conceptual designs are not sensitive to the changing of the elastic modulus of the bone and the volume-fraction constraint. The reason for the similarity between the designs is the close connections, they have a special role in maximizing the stiffness. With the use of our design space, a lot of bone grafts can be put behind the cage and it can give an idea for sheet metal conceptual designs. Due to the close connections, similar conceptual variants are generated under normal walking load, which can be used for faster calculations in similar cases.},
	year = {2022},
	eissn = {1587-379X},
	pages = {253-259},
	orcid-numbers = {Zwierczyk, Péter/0000-0002-5431-1782}
}

@inproceedings{MTMT:32888990,
	title = {Implementation of bone graft adaptation's FE model in hypermesh},
	url = {https://m2.mtmt.hu/api/publication/32888990},
	author = {Dóczi, Martin and Zwierczyk, Péter and Sződy, Róbert},
	booktitle = {Proceedings of the 35th ECMS International Conference on Modelling and Simulation ECMS 2021},
	doi = {10.7148/2021-0152},
	unique-id = {32888990},
	abstract = {Research significance: In the clinical practice, surgeons sometimes must deal with extended bone defects. Among others, bone grafts are used for filling the large absence. After implantation, the structure of the graft can change, and the graft's load-bearing effect can be significant. This leads to the idea, that during the design of an implant this effect should be taken into account in the finite element simulations. In this paper, the authors show the implementation of the bone graft adaptation. Methodology: This programming task was done by using Python, Tcl and the HyperMesh interface. The bone remodeling algorithm and the related parameters were from the literature research. The results are shown with a finite element model prepared for the Optistruct solver, where the geometry models were based on a patient's CT data. Results: Viewing the bone graft's elemental apparent density, the most loaded areas could be detected. Conclusion: The model can predict qualitatively the bone graft's change, which can provide additional information for the implant design. Further analyses are required to investigate the sensitivity of the results. © ECMS Khalid Al-Begain, Mauro Iacono, Lelio Campanile, Andrzej Bargiela (Editors)},
	keywords = {finite element method; finite element analysis; bone remodeling; clinical research; Grafting (chemical); Clinical practices; Finite element simulations; Programming tasks; acetabular bone defect; Apparent density; Implant design; Acetabular cage; Bone graft adaptation; HyperMesh; Literature researches; Research significances},
	year = {2021},
	pages = {152-156}
}

@article{MTMT:31751045,
	title = {Csontgraft változásának végeselemes modellezése HyperMesh-Calculix környezetben},
	url = {https://m2.mtmt.hu/api/publication/31751045},
	author = {Dóczi, Martin and Sződy, Róbert and Zwierczyk, Péter},
	journal-iso = {GÉP},
	journal = {GÉP},
	volume = {71},
	unique-id = {31751045},
	issn = {0016-8572},
	year = {2020},
	pages = {15-18}
}

@inproceedings{MTMT:31654438,
	title = {Failure analysis of a custom-made acetabular cage with finite element method},
	url = {https://m2.mtmt.hu/api/publication/31654438},
	author = {Dóczi, Martin and Zwierczyk, Péter and Sződy, Róbert},
	booktitle = {Proceedings of the 34th International ECMS Conference on Modelling and Simulation, ECMS 2020},
	doi = {10.7148/2020-0250},
	unique-id = {31654438},
	year = {2020},
	pages = {250-255},
	orcid-numbers = {Zwierczyk, Péter/0000-0002-5431-1782}
}

@misc{MTMT:31654493,
	title = {Vápakosaras rögzítés vizsgálata végeselemes módszerrel},
	url = {https://m2.mtmt.hu/api/publication/31654493},
	author = {Dóczi, Martin and Simonovics, János and Sződy, Róbert},
	unique-id = {31654493},
	year = {2019}
}

@misc{MTMT:31654498,
	title = {Egyedi vápakosár végeselemes vizsgálata},
	url = {https://m2.mtmt.hu/api/publication/31654498},
	author = {Dóczi, Martin and Simonovics, János and Sződy, Róbert},
	unique-id = {31654498},
	year = {2018}
}

@article{MTMT:31654459,
	title = {Egyedi vápakosaras rögzítés végeselemes modelljének elkészítése},
	url = {https://m2.mtmt.hu/api/publication/31654459},
	author = {Dóczi, Martin and Simonovics, János},
	journal-iso = {GÉP},
	journal = {GÉP},
	volume = {69},
	unique-id = {31654459},
	issn = {0016-8572},
	year = {2018},
	pages = {8-11}
}

@misc{MTMT:31654486,
	title = {Implantátummal rögzített törött alkar terhelhetőségének végeselemes vizsgálata},
	url = {https://m2.mtmt.hu/api/publication/31654486},
	author = {Dóczi, Martin and Simonovics, János and Zoltán, Gergely},
	unique-id = {31654486},
	year = {2017}
}