The effect of different size of slicing spheres of polyaxial screw head on static compression mechanical test

Po Yi Liu, Yu Tzu Wang, Hsien Wen Wang, Shao Fu Huang, Yang Sung Lin, Po Liang Lai*, Chun Li Lin

*此作品的通信作者

研究成果: Conference contribution同行評審

摘要

Background The pedicle screw fixation system is the gold standard treated method in clinical for the unstable disease. Generally, pedicle screw can be classified into two categories included monoaxial and polyaxial constructions. Although the polyaxial screws were common used owing to it can provide more degree of freedom on the screw-to-rod connection to facilitate rod seating. However, the complexity of structural design may reduce their mechanical strength. The size of slicing spheres of polyaxial screw head was found as the important issue to influence the mechanical strength of the pedicle screw system. Therefore, this study investigated the effects of different size of slicing spheres of polyaxial screw head on the vertebrectomy model under compression test. Material and Method The different size (60, 75 and 90% diameter) of slicing spheres of polyaxial screw head were assembled for destructive mechanical testing. All pedicle screw systems assemblies were tested in compression test according to FDA regulation testing method of ASTM F1717. The stiffness and ultimate load were determined for different slicing spheres of screws. Result and discussion The results of testing found that stiffness were 10.91 ± 2.03, 19.34 ± 1.21, and 23.39 ± 0.85 N/mm and ultimate loads were 185.43 ± 14.57, 264.44 ± 21.68, and 364.54 ± 10.43 N for 60, 75, and 90% diameter, respectively. Significant differences (p < 0.05) were found among these three groups. Conclusion The mechanical strength presented by stiffness and ultimate load increased as the size of slicing spheres of polyaxial screw head increased.

原文English
主出版物標題2nd International Conference for Innovation in Biomedical Engineering and Life Sciences - ICIBEL 2017 in conjunction with APCMBE 2017
編輯Juliana Usman, Fatimah Ibrahim, Mohd Yazed Ahmad, Swe Jyan Teh, Norhamizan Hamzah
發行者Springer Verlag
頁面61-65
頁數5
ISBN(列印)9789811075537
DOIs
出版狀態Published - 2018
事件2nd International Conference for Innovation in Biomedical Engineering and Life Sciences, ICIBEL 2017, held in conjunction with the 10th Asia Pacific Conference on Medical and Biological Engineering, APCMBE 2017 - Penang, Malaysia
持續時間: 10 12月 201713 12月 2017

出版系列

名字IFMBE Proceedings
67
ISSN(列印)1680-0737

Conference

Conference2nd International Conference for Innovation in Biomedical Engineering and Life Sciences, ICIBEL 2017, held in conjunction with the 10th Asia Pacific Conference on Medical and Biological Engineering, APCMBE 2017
國家/地區Malaysia
城市Penang
期間10/12/1713/12/17

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