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Meuser AH, Henyš P, Höch A, Gänsslen A, Hammer N. Evaluating the stability of external fixators following pelvic injury: A systematic review of biomechanical testing methods. J Mech Behav Biomed Mater 2024; 153:106488. [PMID: 38437754 DOI: 10.1016/j.jmbbm.2024.106488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 10/31/2023] [Accepted: 02/26/2024] [Indexed: 03/06/2024]
Abstract
INTRODUCTION This systematic review aims to identify previously used techniques in biomechanics to assess pelvic instability following pelvic injury, focusing on external fixation constructs. METHODS A systematic literature search was conducted to include biomechanical studies and to exclude clinical trials. RESULTS Of an initial 4666 studies found, 38 met the inclusion criteria. 84% of the included studies were retrieved from PubMed, Scopus, and Web of Science. The studies analysed 106 postmortem specimens, 154 synthetic bones, and 103 computational models. Most specimens were male (97% synthetic, 70% postmortem specimens). Both the type of injury and the classification system employed varied across studies. About 82% of the injuries assessed were of type C. Two different fixators were tested for FFPII and type A injury, five for type B injury, and fifteen for type C injury. Large variability was observed for external fixation constructs concerning device type and configuration, pin size, and geometry. Biomechanical studies deployed various methods to assess injury displacement, deformation, stiffness, and motion. Thereby, loading protocols differed and inconsistent definitions of failure were determined. Measurement techniques applied in biomechanical test setups included strain gauges, force transducers, and motion tracking techniques. DISCUSSION AND CONCLUSION An ideal fixation method should be safe, stable, non-obstructive, and have low complication rates. Although biomechanical testing should ensure that the load applied during testing is representative of a physiological load, a high degree of variability was found in the current literature in both the loading and measurement equipment. The lack of a standardised test design for fixation constructs in pelvic injuries across the studies challenges comparisons between them. When interpreting the results of biomechanical studies, it seems crucial to consider the limitations in cross-study comparability, with implications on their applicability to the clinical setting.
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Affiliation(s)
- Annika Hela Meuser
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Petr Henyš
- Institute of New Technologies and Applied Informatics, Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Liberec, Czech Republic
| | - Andreas Höch
- Department of Orthopedic and Trauma Surgery, University of Leipzig, Leipzig, Germany
| | - Axel Gänsslen
- Clinic for Trauma Surgery, Orthopaedics and Hand Surgery, Wolfsburg Hospital, Wolfsburg, Germany
| | - Niels Hammer
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria; Department of Orthopedic and Trauma Surgery, University of Leipzig, Leipzig, Germany; Division of Biomechatronics, Fraunhofer IWU, Dresden, Germany.
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Lin AC, Pirrung F, Niestrawska JA, Ondruschka B, Pinter G, Henyš P, Hammer N. Shape or size matters? Towards standard reporting of tensile testing parameters for human soft tissues: systematic review and finite element analysis. Front Bioeng Biotechnol 2024; 12:1368383. [PMID: 38600944 PMCID: PMC11005100 DOI: 10.3389/fbioe.2024.1368383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Accepted: 03/14/2024] [Indexed: 04/12/2024] Open
Abstract
Material properties of soft-tissue samples are often derived through uniaxial tensile testing. For engineering materials, testing parameters (e.g., sample geometries and clamping conditions) are described by international standards; for biological tissues, such standards do not exist. To investigate what testing parameters have been reported for tensile testing of human soft-tissue samples, a systematic review of the literature was performed using PRISMA guidelines. Soft tissues are described as anisotropic and/or hyperelastic. Thus, we explored how the retrieved parameters compared against standards for engineering materials of similar characteristics. All research articles published in English, with an Abstract, and before 1 January 2023 were retrieved from databases of PubMed, Web of Science, and BASE. After screening of articles based on search terms and exclusion criteria, a total 1,096 articles were assessed for eligibility, from which 361 studies were retrieved and included in this review. We found that a non-tapered shape is most common (209 of 361), followed by a tapered sample shape (92 of 361). However, clamping conditions varied and were underreported (156 of 361). As a preliminary attempt to explore how the retrieved parameters might influence the stress distribution under tensile loading, a pilot study was performed using finite element analysis (FEA) and constitutive modeling for a clamped sample of little or no fiber dispersion. The preliminary FE simulation results might suggest the hypothesis that different sample geometries could have a profound influence on the stress-distribution under tensile loading. However, no conclusions can be drawn from these simulations, and future studies should involve exploring different sample geometries under different computational models and sample parameters (such as fiber dispersion and clamping effects). Taken together, reporting and choice of testing parameters remain as challenges, and as such, recommendations towards standard reporting of uniaxial tensile testing parameters for human soft tissues are proposed.
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Affiliation(s)
- Alvin C. Lin
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
- Institute of Anatomy and Cell Biology, Paracelsus Medical University, Salzburg, Austria
| | - Felix Pirrung
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Justyna A. Niestrawska
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Benjamin Ondruschka
- Institute of Legal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Gerald Pinter
- Institute of Materials Science and Testing of Polymers, Montanuniversität Leoben, Leoben, Austria
| | - Petr Henyš
- Institute of New Technologies and Applied Informatics, Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Liberec, Czechia
| | - Niels Hammer
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
- Department of Orthopedic and Trauma Surgery, University of Leipzig, Leipzig, Germany
- Fraunhofer Institute for Forming Tools, Division of Biomechatronics, Dresden, Germany
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Gonzalez Lopez M, Huteckova B, Lavicky J, Zezula N, Rakultsev V, Fridrichova V, Tuaima H, Nottmeier C, Petersen J, Kavkova M, Zikmund T, Kaiser J, Lav R, Star H, Bryja V, Henyš P, Vořechovský M, Tucker AS, Harnos J, Buchtova M, Krivanek J. Spatiotemporal monitoring of hard tissue development reveals unknown features of tooth and bone development. Sci Adv 2023; 9:eadi0482. [PMID: 37531427 PMCID: PMC10396306 DOI: 10.1126/sciadv.adi0482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 06/28/2023] [Indexed: 08/04/2023]
Abstract
Mineralized tissues, such as bones or teeth, are essential structures of all vertebrates. They enable rapid movement, protection, and food processing, in addition to providing physiological functions. Although the development, regeneration, and pathogenesis of teeth and bones have been intensely studied, there is currently no tool to accurately follow the dynamics of growth and healing of these vital tissues in space and time. Here, we present the BEE-ST (Bones and tEEth Spatio-Temporal growth monitoring) approach, which allows precise quantification of development, regeneration, remodeling, and healing in any type of calcified tissue across different species. Using mouse teeth as model the turnover rate of continuously growing incisors was quantified, and role of hard/soft diet on molar root growth was shown. Furthermore, the dynamics of bones and teeth growth in lizards, frogs, birds, and zebrafish was uncovered. This approach represents an effective, highly reproducible, and versatile tool that opens up diverse possibilities in developmental biology, bone and tooth healing, tissue engineering, and disease modeling.
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Affiliation(s)
- Marcos Gonzalez Lopez
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Barbora Huteckova
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
- Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Brno, Czech Republic
| | - Josef Lavicky
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Nikodem Zezula
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Vladislav Rakultsev
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Vendula Fridrichova
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Haneen Tuaima
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Cita Nottmeier
- Department of Orthodontics, University of Leipzig Medical Center, Leipzig, Germany
| | - Julian Petersen
- Department of Orthodontics, University of Leipzig Medical Center, Leipzig, Germany
| | - Michaela Kavkova
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
- Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic
| | - Tomas Zikmund
- Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic
| | - Jozef Kaiser
- Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic
| | - Rupali Lav
- Centre for Craniofacial and Regenerative Biology, King’s College London, London, UK
| | - Haza Star
- Centre for Craniofacial and Regenerative Biology, King’s College London, London, UK
| | - Vítězslav Bryja
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Petr Henyš
- Institute of New Technologies and Applied Informatics, Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Liberec, Czech Republic
| | - Miroslav Vořechovský
- Institute of Structural Mechanics, Faculty of Civil Engineering, Brno University of Technology, Czech Republic
| | - Abigail S. Tucker
- Centre for Craniofacial and Regenerative Biology, King’s College London, London, UK
- Institute of Histology and Embryology, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Jakub Harnos
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Marcela Buchtova
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
- Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Brno, Czech Republic
| | - Jan Krivanek
- Department of Histology and Embryology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
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Henyš P, Ramezani M, Schewitz D, Höch A, Möbius D, Ondruschka B, Hammer N. Sacrospinous and sacrotuberous ligaments influence in pelvis kinematics. J Anat 2022; 241:928-937. [PMID: 35986644 PMCID: PMC9482702 DOI: 10.1111/joa.13739] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 06/24/2022] [Accepted: 07/25/2022] [Indexed: 11/30/2022] Open
Abstract
The alteration in mechanical properties of posterior pelvis ligaments may cause a biased pelvis deformation which, in turn, may contribute to hip and spine instability and malfunction. Here, the effect of different mechanical properties of ligaments on lumbopelvic deformation is analyzed via the finite element method. First, the improved finite element model was validated using experimental data from previous studies and then used to calculate the sensitivity of lumbopelvic deformation to changes in ligament mechanical properties, load magnitude, and unilateral ligament resection. The deformation of the lumbopelvic complex relative to a given load was predominant in the medial plane. The effect of unilateral resection on deformation appeared to be counterintuitive, suggesting that ligaments have the ability to redistribute load and that they play an important role in the mechanics of the lumbopelvic complex.
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Affiliation(s)
- Petr Henyš
- Institute of New Technologies and Applied Informatics, Faculty of Mechatronics, Informatics and Interdisciplinary Studies Technical University of Liberec Liberec Czech Republic
| | - Maziar Ramezani
- Department of Mechanical Engineering Auckland University of Technology Auckland New Zealand
| | - Daniel Schewitz
- Department of Mechanical Engineering Auckland University of Technology Auckland New Zealand
| | - Andreas Höch
- Department of Trauma, Orthopedic and Plastic Surgery University Hospital of Leipzig Leipzig Germany
| | - Dustin Möbius
- Institute of Legal Medicine University Medical Centre Hamburg‐Eppendorf Hamburg Germany
| | - Benjamin Ondruschka
- Institute of Legal Medicine University Medical Centre Hamburg‐Eppendorf Hamburg Germany
| | - Niels Hammer
- Department of Trauma, Orthopedic and Plastic Surgery University Hospital of Leipzig Leipzig Germany
- Division of Macroscopic and Clinical Anatomy, Gottfried Schatz Research Center Medical University of Graz Graz Austria
- Fraunhofer Institute for Machine Tools and Forming Technology Dresden Germany
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Henyš P, Vořechovský M, Stebel J, Kuchař M, Exner P. From computed tomography to finite element space: A unified bone material mapping strategy. Clin Biomech (Bristol, Avon) 2022; 97:105704. [PMID: 35849946 DOI: 10.1016/j.clinbiomech.2022.105704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 03/23/2022] [Accepted: 06/07/2022] [Indexed: 02/07/2023]
Abstract
BACKGROUND The spatially varying mechanical properties in finite element models of bone are most often derived from bone density data obtained via quantitative computed tomography. The key step is to accurately and efficiently map the density given in voxels to the finite element mesh. METHODS The density projection is first formulated in least-squares terms and then discretized using a continuous and discontinuous variant of the finite element method. Both discretization variants are compared with the nodal and element approaches known from the literature. FINDINGS In terms of accuracy in the L2 norm, energy distance and efficiency, the discontinuous zero-order variant appears to be the most advantageous. The proposed variant sufficiently preserves the spectrum of density at the edges, while keeping computational cost low. INTERPRETATION The continuous finite element method is analogous to the nodal formulation in the literature, while the discontinuous finite element method is analogous to the element formulation. The two variants differ in terms of implementation, computational cost and ability to preserve the density spectrum. These differences cannot be described and measured by known indirect methods from the literature.
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Affiliation(s)
- Petr Henyš
- Institute of New Technologies and Applied Informatics, Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic
| | - Miroslav Vořechovský
- Institute of Structural Mechanics, Faculty of Civil Engineering, Brno University of Technology, Veveří 331/95, 60200 Brno, Czech Republic
| | - Jan Stebel
- Institute of New Technologies and Applied Informatics, Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic
| | - Michal Kuchař
- Department of Anatomy, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 50003, Hradec Králové, Czech Republic
| | - Pavel Exner
- Institute of New Technologies and Applied Informatics, Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic.
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Henyš P, Vořechovský M, Kuchař M, Heinemann A, Kopal J, Ondruschka B, Hammer N. Bone mineral density modeling via random field: Normality, stationarity, sex and age dependence. Comput Methods Programs Biomed 2021; 210:106353. [PMID: 34500142 DOI: 10.1016/j.cmpb.2021.106353] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 08/06/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND AND OBJECTIVE Capturing the population variability of bone properties is of paramount importance to biomedical engineering. The aim of the present paper is to describe variability and correlations in bone mineral density with a spatial random field inferred from routine computed tomography data. METHODS Random fields were simulated by transforming pairwise uncorrelated Gaussian random variables into correlated variables through the spectral decomposition of an age-detrended correlation matrix. The validity of the random field model was demonstrated in the spatiotemporal analysis of bone mineral density. The similarity between the computed tomography samples and those generated via random fields was analyzed with the energy distance metric. RESULTS The random field of bone mineral density was found to be approximately Gaussian/slightly left-skewed/strongly right-skewed at various locations. However, average bone density could be simulated well with the proposed Gaussian random field for which the energy distance, i.e., a measure that quantifies discrepancies between two distribution functions, is convergent with respect to the number of correlation eigenpairs. CONCLUSIONS The proposed random field model allows the enhancement of computational biomechanical models with variability in bone mineral density, which could increase the usability of the model and provides a step forward in in-silico medicine.
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Affiliation(s)
- Petr Henyš
- Institute of New Technologies and Applied Informatics, Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Studentskí 1402/2, Liberec 461 17, Czech Republic
| | - Miroslav Vořechovský
- Institute of Structural Mechanics, Faculty of Civil Engineering, Brno University of Technology, Veveří 331/95, Brno 602 00, Czech Republic
| | - Michal Kuchař
- Department of Anatomy, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, Hradec Králové, 500 03, Czech Republic.
| | - Axel Heinemann
- Institut für Rechtsmedizin, Universitätsklinikum Hamburg-Eppendorf, Butenfeld 34, Hamburg 22529, Germany
| | - Jiří Kopal
- Institute of New Technologies and Applied Informatics, Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Studentskí 1402/2, Liberec 461 17, Czech Republic
| | - Benjamin Ondruschka
- Institut für Rechtsmedizin, Universitätsklinikum Hamburg-Eppendorf, Butenfeld 34, Hamburg 22529, Germany
| | - Niels Hammer
- Department of Macroscopic and Clinical Anatomy, Medical University of Graz, Auenbruggerpl. 2, Graz 8036, Austria; Department of Orthopedic and Trauma Surgery, University of Leipzig, Leipzig, Germany; Fraunhofer Institute for Machine Tools and Forming Technology IWU, Nöthnitzer Straße 44, 01187, Dresden, Germany
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Henyš P, Kuchař M, Hájek P, Hammer N. Mechanical metric for skeletal biomechanics derived from spectral analysis of stiffness matrix. Sci Rep 2021; 11:15690. [PMID: 34344907 PMCID: PMC8333423 DOI: 10.1038/s41598-021-94998-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 07/19/2021] [Indexed: 02/07/2023] Open
Abstract
A new metric for the quantitative and qualitative evaluation of bone stiffness is introduced. It is based on the spectral decomposition of stiffness matrix computed with finite element method. The here proposed metric is defined as an amplitude rescaled eigenvalues of stiffness matrix. The metric contains unique information on the principal stiffness of bone and reflects both bone shape and material properties. The metric was compared with anthropometrical measures and was tested for sex sensitivity on pelvis bone. Further, the smallest stiffness of pelvis was computed under a certain loading condition and analyzed with respect to sex and direction. The metric complements anthropometrical measures and provides a unique information about the smallest bone stiffness independent from the loading configuration and can be easily computed by state-of-the-art subject specified finite element algorithms.
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Affiliation(s)
- Petr Henyš
- grid.6912.c0000000110151740Institute of New Technologies and Applied Informatics, Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Studentská 1402/2, 461 17 Liberec, Czech Republic
| | - Michal Kuchař
- grid.4491.80000 0004 1937 116XDepartment of Anatomy, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03 Hradec Králové, Czech Republic
| | - Petr Hájek
- grid.4491.80000 0004 1937 116XDepartment of Anatomy, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03 Hradec Králové, Czech Republic
| | - Niels Hammer
- grid.11598.340000 0000 8988 2476Department of Macroscopic and Clinical Anatomy, Medical University of Graz, Auenbruggerpl. 2, 8036 Graz, Austria ,grid.9647.c0000 0004 7669 9786Department of Orthopedic and Trauma Surgery, University of Leipzig, Leipzig, Germany ,grid.461651.10000 0004 0574 2038Fraunhofer Institute for Machine Tools and Forming Technology IWU, Nöthnitzer Straße 44, 01187 Dresden, Germany
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Šafka J, Ackermann M, Véle F, Macháček J, Henyš P. Mechanical Properties of Polypropylene: Additive Manufacturing by Multi Jet Fusion Technology. Materials (Basel) 2021; 14:ma14092165. [PMID: 33922827 PMCID: PMC8123042 DOI: 10.3390/ma14092165] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 04/17/2021] [Accepted: 04/20/2021] [Indexed: 11/16/2022]
Abstract
Multi jet fusion (MJF) technology has proven its significance in recent years as this technology has continually increased its market share. Recently, polypropylene (PP) was introduced by Hewlett-Packard for the given technology. To our knowledge, little is known about the mechanical properties of polypropylene processed by MJF technology. During this study, standardised specimens were printed under all of the major orientations of the machine’s build space. Each of these orientations were represented by five samples. The specimens then underwent tensile, bending and Charpy impact tests to analyse their mechanical properties. The structural analysis was conducted to determine whether PP powder may be reused within the MJF process. The mechanical tests showed that the orientation of the samples significantly influences their mechanical response and must be carefully chosen to obtain the optimal mechanical properties of PP samples. We further showed that PP powder may be reused as the MJF process does not significantly alter its thermal and structural properties.
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Affiliation(s)
- Jiří Šafka
- The Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 461 17 Liberec, Czech Republic;
- Correspondence: ; Tel.: +420-485-353-801
| | - Michal Ackermann
- The Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentská 1402/2, 461 17 Liberec, Czech Republic;
| | - Filip Véle
- Faculty of Mechanical Engineering, Technical University of Liberec, Studentská 1402/2, 461 17 Liberec, Czech Republic;
| | - Jakub Macháček
- Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Studentská 1402/2, 461 17 Liberec, Czech Republic; (J.M.); (P.H.)
| | - Petr Henyš
- Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Studentská 1402/2, 461 17 Liberec, Czech Republic; (J.M.); (P.H.)
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Kuchař M, Henyš P, Rejtar P, Hájek P. Shape morphing technique can accurately predict pelvic bone landmarks. Int J Legal Med 2021; 135:1617-1626. [PMID: 33502550 DOI: 10.1007/s00414-021-02501-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 01/04/2021] [Indexed: 11/30/2022]
Abstract
Diffeomorphic shape registration allows for the seamless geometric alignment of shapes. In this study, we demonstrated the use of a registration algorithm to automatically seed anthropological landmarks on the CT images of the pelvis. We found a high correlation between manually and automatically seeded landmarks. The registration algorithm makes it possible to achieve a high degree of automation with the potential to reduce operator errors in the seeding of anthropological landmarks. The results of this study represent a promising step forward in effectively defining the anthropological measures of the human skeleton.
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Affiliation(s)
- Michal Kuchař
- Department of Anatomy, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03, Hradec Králové, Czech Republic
| | - Petr Henyš
- Institute of New Technologies and Applied Informatics, Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Studentská 1402/2, 461 17, Liberec, Czech Republic.
| | - Pavel Rejtar
- Department of Radiology, University Hospital Hradec Králové, Sokolská 581, 500 05, Hradec Králové, Czech Republic
| | - Petr Hájek
- Department of Anatomy, Faculty of Medicine in Hradec Králové, Charles University, Šimkova 870, 500 03, Hradec Králové, Czech Republic
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Sutula D, Henyš P, Čapek L. Optimal structural pattern for maximal compliance using topology optimization based on phasefields: Application to improve skin graft meshing efficiency. Int J Numer Method Biomed Eng 2020; 36:e3405. [PMID: 33038044 DOI: 10.1002/cnm.3405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 08/19/2020] [Accepted: 09/28/2020] [Indexed: 06/11/2023]
Abstract
This article focuses on the problem of maximal compliance design of a hyper-elastic solid with the optimal design of human skin grafts as the application in mind. The solution method is a phasefield-based topology optimization method that supposes multiple local phasefields and a minimum distance constraint in order to prevent the phasefields from merging. Consequently, structurally disintegrating solutions such as by the coalescence of voids can be prevented. The method is used to find an optimal graft meshing pattern for a sample that is subjected to a biaxial extension of up to 150%, which corresponds to an expansion ratio of 1 : 2.25. Three prospective unitcell solutions that exhibit meta-material behavior are proposed for a periodic graft pattern. The results are a step toward improving the skin graft meshing efficiency. This work does not cover experimental validation.
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Affiliation(s)
- Danas Sutula
- Department of Technologies and Structures l Faculty of Textile Engineering, Technical University of Liberec, Liberec, Czech Republic
| | - Petr Henyš
- Department of Technologies and Structures l Faculty of Textile Engineering, Technical University of Liberec, Liberec, Czech Republic
| | - Lukáš Čapek
- Department of Technologies and Structures l Faculty of Textile Engineering, Technical University of Liberec, Liberec, Czech Republic
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Affiliation(s)
- Petr Henyš
- Department of Technologies and Structures, Technical University of Liberec, Liberec, Czech Republic
| | - Lukáš Čapek
- Department of Technologies and Structures, Technical University of Liberec, Liberec, Czech Republic
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Henyš P, Ackermann M, Čapek L, Drahorád T, Šimůnek A, Exnerová M. Stress and fatigue analysis of cantilevered bridge during biting: a computer study. Comput Methods Biomech Biomed Engin 2017; 20:103-104. [DOI: 10.1080/10255842.2017.1382882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- P. Henyš
- Department of Textile Technologies, Technical University of Liberec, Liberec, Czech Republic
| | - M. Ackermann
- Center of Nanomaterials CxI, Technical University of Liberec, Bendlova, Liberec, Czech Republic
| | - L. Čapek
- Department of Textile Technologies, Technical University of Liberec, Liberec, Czech Republic
| | - T. Drahorád
- Department of Textile Technologies, Technical University of Liberec, Liberec, Czech Republic
| | - A. Šimůnek
- Faculty of Medicine in Hradec Kralove, Department of Dentistry, Charles University, Prague, Hradec Králové, Czech Republic
| | - M. Exnerová
- Faculty of Medicine in Hradec Kralove, Department of Dentistry, Charles University, Prague, Hradec Králové, Czech Republic
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Goossens Q, Leuridan S, Henyš P, Roosen J, Pastrav L, Mulier M, Desmet W, Denis K, Vander Sloten J. Development of an acoustic measurement protocol to monitor acetabular implant fixation in cementless total hip Arthroplasty: A preliminary study. Med Eng Phys 2017; 49:28-38. [PMID: 28760407 DOI: 10.1016/j.medengphy.2017.07.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 04/24/2017] [Accepted: 07/12/2017] [Indexed: 11/27/2022]
Abstract
In cementless total hip arthroplasty (THA), the initial stability is obtained by press-fitting the implant in the bone to allow osseointegration for a long term secondary stability. However, finding the insertion endpoint that corresponds to a proper initial stability is currently based on the tactile and auditory experiences of the orthopedic surgeon, which can be challenging. This study presents a novel real-time method based on acoustic signals to monitor the acetabular implant fixation in cementless total hip arthroplasty. Twelve acoustic in vitro experiments were performed on three types of bone models; a simple bone block model, an artificial pelvic model and a cadaveric model. A custom made beam was screwed onto the implant which functioned as a sound enhancer and insertor. At each insertion step an acoustic measurement was performed. A significant acoustic resonance frequency shift was observed during the insertion process for the different bone models; 250 Hz (35%, second bending mode) to 180 Hz (13%, fourth bending mode) for the artificial bone block models and 120 Hz (11%, eighth bending mode) for the artificial pelvis model. No significant frequency shift was observed during the cadaveric experiment due to a lack of implant fixation in this model. This novel diagnostic method shows the potential of using acoustic signals to monitor the implant seating during insertion.
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Affiliation(s)
- Quentin Goossens
- KU Leuven, Department of Mechanical Engineering, Smart Instrumentation, Andreas Vesaliusstraat 13, 3000 Leuven, Belgium.
| | - Steven Leuridan
- KU Leuven, Department of Mechanical Engineering, Biomechanics Section, Celestijnenlaan 300C, 3001 Leuven, Belgium
| | - Petr Henyš
- Technical University of Liberec, Studentská 1402/2,461 17 Liberec, Czech Republic
| | - Jorg Roosen
- KU Leuven, UZ Pellenberg, Department of Orthopaedics, Weligerveld 1, 3212 Pellenberg, Belgium
| | - Leonard Pastrav
- KU Leuven, Department of Mechanical Engineering, Smart Instrumentation, Andreas Vesaliusstraat 13, 3000 Leuven, Belgium
| | - Michiel Mulier
- KU Leuven, UZ Pellenberg, Department of Orthopaedics, Weligerveld 1, 3212 Pellenberg, Belgium
| | - Wim Desmet
- KU Leuven, Department of Mechanical Engineering, Production Engineering, Machine Design and Automation Division, Celestijnenlaan 300C, 3001 Leuven, Belgium
| | - Kathleen Denis
- KU Leuven, Department of Mechanical Engineering, Smart Instrumentation, Andreas Vesaliusstraat 13, 3000 Leuven, Belgium
| | - Jos Vander Sloten
- KU Leuven, Department of Mechanical Engineering, Biomechanics Section, Celestijnenlaan 300C, 3001 Leuven, Belgium
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14
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Henyš P, Čapek L. Material model of pelvic bone based on modal analysis: a study on the composite bone. Biomech Model Mechanobiol 2016; 16:363-373. [DOI: 10.1007/s10237-016-0822-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 08/20/2016] [Indexed: 10/21/2022]
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15
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Henyš P, Capek L. Measuring primary stability of cervical implant. Comput Methods Biomech Biomed Engin 2012; 15 Suppl 1:340-2. [PMID: 23009533 DOI: 10.1080/10255842.2012.713611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- P Henyš
- Department of Applied Mechanics, Technical University, Liberec, Czech Republic
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