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Evaluation of the Effect of Fixation Angle between Polyaxial Pedicle Screw Head and Rod on the Failure of Screw-Rod Connection

Show simple item record Cetin, Engin Ozkaya, Mustafa Guler, Umit Ozgur Acaroglu, Emre Demir, Teyfik 2019-06-26T08:07:05Z 2019-06-26T08:07:05Z 2015
dc.identifier.citation Çetin, E., Özkaya, M., Güler, Ü. Ö., Acaroğlu, E., & Demir, T. (2015). Evaluation of the effect of fixation angle between polyaxial pedicle screw head and rod on the failure of screw-rod connection. Applied bionics and biomechanics, 2015. en_US
dc.identifier.issn 1176-2322
dc.description.abstract Introduction. Polyaxial screws had been only tested according to the ASTM standards (when they were perpendicularly positioned to the rod). In this study, effects of the pedicle screws angled fixation to the rod on the mechanical properties of fixation were investigated. Materials and Method. 30 vertically fixed screws and 30 screws fixed with angle were used in the study. Screws were used in three different diameters which were 6.5 mm, 7.0 mm, and 7.5 mm, in equal numbers. Axial pull-out and flexion moment tests were performed. Test results compared with each other using appropriate statistical methods. Results. In pull-out test, vertically fixed screws, in 6.5 mm and 7.0 mm diameter, had significantly higher maximum load values than angled fixed screws with the same diameters (P < 0.01). Additionally, vertically fixed screws, in all diameters, had significantly greater stiffness according to corresponding size fixed with angle (P < 0.005). Conclusion. Fixing the pedicle screw to the rod with angle significantly decreased the pull-out stiffness in all diameters. Similarly, pedicle screw instrumentation fixed with angle decreased the minimum sagittal angle between the rod and the screw in all diameters for flexion moment test but the differences were not significant. en_US
dc.description.sponsorship The authors would like to acknowledge the financial support of Turkish Science Foundation (TUBITAK) with the Project no. 111M583 and no. 113S101 for the study. Authors also would like to acknowledge the Osimplant (Bone implant) Ltd. Sti. for the donation of implants.
dc.language.iso eng en_US
dc.publisher Hindawi Ltd en_US
dc.rights info:eu-repo/semantics/openAccess
dc.subject Adolescent idiopathic scoliosis en_US
dc.subject Posterior spinal-fusion en_US
dc.subject Finite-element analyses en_US
dc.subject Pullout strength en_US
dc.subject Biomechanical analysis en_US
dc.subject Hook instrumentation en_US
dc.subject Mechanical stability en_US
dc.subject Lumbar spine en_US
dc.subject Complications en_US
dc.subject Deformity en_US
dc.title Evaluation of the Effect of Fixation Angle between Polyaxial Pedicle Screw Head and Rod on the Failure of Screw-Rod Connection en_US
dc.type article en_US
dc.relation.journal Applied Bionics And Biomechanics en_US
dc.contributor.department TOBB ETU, Faculty of Engineering, Department of Mechanical Engineering en_US
dc.contributor.department TOBB ETÜ, Mühendislik Fakültesi, Makine Mühendisliği Bölümü tr_TR
dc.identifier.startpage 1
dc.identifier.endpage 9
dc.relation.tubitak Turkish Science Foundation (TUBITAK) [111M583, 113S101] en_US
dc.identifier.wos WOS:000350437700001
dc.identifier.scopus 2-s2.0-84925014448
dc.contributor.tobbetuauthor Demir, Teyfik
dc.contributor.YOKid 144123
dc.identifier.PubMedID PMID:27019578
dc.identifier.doi 10.1155/2015/150649
dc.relation.publicationcategory Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı tr_TR

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