A novel auxetic structure based bone screw design: Tensile mechanical characterization and pullout fixation strength evaluation
It was supposed that auxetic structure with negative Poisson's ratio (NPR) expands under stretch and could enhance the screw-bone fixation. In this study, the novel auxetic structure based bone screws were designed, and mechanical properties and fixation strength were evaluated. Auxetic unit ce...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2020-03-01
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| Series: | Materials & Design |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127519308627 |
| _version_ | 1819296398203420672 |
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| author | Yan Yao Lizhen Wang Jian Li Shan Tian Ming Zhang Yubo Fan |
| author_facet | Yan Yao Lizhen Wang Jian Li Shan Tian Ming Zhang Yubo Fan |
| author_sort | Yan Yao |
| collection | DOAJ |
| description | It was supposed that auxetic structure with negative Poisson's ratio (NPR) expands under stretch and could enhance the screw-bone fixation. In this study, the novel auxetic structure based bone screws were designed, and mechanical properties and fixation strength were evaluated. Auxetic unit cells (A1–A6) were introduced into the design of screw bodies after a mechanical evaluation. Tubular auxetic structures (TA1–TA6), auxetic screws (AS1–AS6) and one non-auxetic screw (NS) were manufactured using 3D-printing. The fabrication process well reproduced the original designs despite the some mismatch in the macro and micro morphologies. Tensile tests on specimens were conducted experimentally and computationally. The relationship between NPR and fixation strength of the screws was investigated by computationally bone-pullout test. Among all screw designs, AS2 generated the largest stiffness and strength, and better NPR, AS5 produced the highest NPR, and smallest stiffness and strength. Maximal pullout force within low-, mid- and high-density bone was shown in AS5 (399.39 N), AS6 (561.07 N) and AS2 (1185.93 N) respectively. It was concluded that varying auxetic structures altered the screw's mechanical properties especially its functional properties. The bone-screw fixation could be improved by auxetic structures while other design factors should also be taken in account. Keywords: Bone screw, Auxetic structure, 3D printing, Mechanical properties, Pullout force |
| first_indexed | 2024-12-24T04:57:28Z |
| format | Article |
| id | doaj.art-d37e884f51d844869c57cf34cb44e88a |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-24T04:57:28Z |
| publishDate | 2020-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-d37e884f51d844869c57cf34cb44e88a2022-12-21T17:14:20ZengElsevierMaterials & Design0264-12752020-03-01188A novel auxetic structure based bone screw design: Tensile mechanical characterization and pullout fixation strength evaluationYan Yao0Lizhen Wang1Jian Li2Shan Tian3Ming Zhang4Yubo Fan5Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China; Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, China; Department of Biomedical Engineering, Faculty of Engineering, The Hong Kong Polytechnic University, Hong Kong, ChinaKey Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China; Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, China; Correspondence to: L. Wang, Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China.Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, China; Beijing Key Laboratory of Rehabilitation Technical Aids for Old-Age and Disability, Key Laboratory of Rehabilitation Aids Technology and System of the Ministry of Civil Affairs, National Research Center for Rehabilitation Technical Aids, Beijing 100176, ChinaKey Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China; Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, ChinaDepartment of Biomedical Engineering, Faculty of Engineering, The Hong Kong Polytechnic University, Hong Kong, ChinaKey Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China; Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100083, China; Beijing Key Laboratory of Rehabilitation Technical Aids for Old-Age and Disability, Key Laboratory of Rehabilitation Aids Technology and System of the Ministry of Civil Affairs, National Research Center for Rehabilitation Technical Aids, Beijing 100176, China; Correspondence to: Y. Fan, Beijing Key Laboratory of Rehabilitation Technical Aids for Old-Age and Disability, Key Laboratory of Rehabilitation Aids Technology and System of the Ministry of Civil Affairs, National Research Center for Rehabilitation Technical Aids, Beijing 100176, China.It was supposed that auxetic structure with negative Poisson's ratio (NPR) expands under stretch and could enhance the screw-bone fixation. In this study, the novel auxetic structure based bone screws were designed, and mechanical properties and fixation strength were evaluated. Auxetic unit cells (A1–A6) were introduced into the design of screw bodies after a mechanical evaluation. Tubular auxetic structures (TA1–TA6), auxetic screws (AS1–AS6) and one non-auxetic screw (NS) were manufactured using 3D-printing. The fabrication process well reproduced the original designs despite the some mismatch in the macro and micro morphologies. Tensile tests on specimens were conducted experimentally and computationally. The relationship between NPR and fixation strength of the screws was investigated by computationally bone-pullout test. Among all screw designs, AS2 generated the largest stiffness and strength, and better NPR, AS5 produced the highest NPR, and smallest stiffness and strength. Maximal pullout force within low-, mid- and high-density bone was shown in AS5 (399.39 N), AS6 (561.07 N) and AS2 (1185.93 N) respectively. It was concluded that varying auxetic structures altered the screw's mechanical properties especially its functional properties. The bone-screw fixation could be improved by auxetic structures while other design factors should also be taken in account. Keywords: Bone screw, Auxetic structure, 3D printing, Mechanical properties, Pullout forcehttp://www.sciencedirect.com/science/article/pii/S0264127519308627 |
| spellingShingle | Yan Yao Lizhen Wang Jian Li Shan Tian Ming Zhang Yubo Fan A novel auxetic structure based bone screw design: Tensile mechanical characterization and pullout fixation strength evaluation Materials & Design |
| title | A novel auxetic structure based bone screw design: Tensile mechanical characterization and pullout fixation strength evaluation |
| title_full | A novel auxetic structure based bone screw design: Tensile mechanical characterization and pullout fixation strength evaluation |
| title_fullStr | A novel auxetic structure based bone screw design: Tensile mechanical characterization and pullout fixation strength evaluation |
| title_full_unstemmed | A novel auxetic structure based bone screw design: Tensile mechanical characterization and pullout fixation strength evaluation |
| title_short | A novel auxetic structure based bone screw design: Tensile mechanical characterization and pullout fixation strength evaluation |
| title_sort | novel auxetic structure based bone screw design tensile mechanical characterization and pullout fixation strength evaluation |
| url | http://www.sciencedirect.com/science/article/pii/S0264127519308627 |
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