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dc.contributor.authorCetin, Engin
dc.contributor.authorOzkaya, Mustafa
dc.contributor.authorGuler, Umit Ozgur
dc.contributor.authorAcaroglu, Emre
dc.contributor.authorDemir, Teyfik
dc.identifier.citationÇetin, 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.description.abstractIntroduction. 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.sponsorshipThe 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.publisherHindawi Ltden_US
dc.subjectAdolescent idiopathic scoliosisen_US
dc.subjectPosterior spinal-fusionen_US
dc.subjectFinite-element analysesen_US
dc.subjectPullout strengthen_US
dc.subjectBiomechanical analysisen_US
dc.subjectHook instrumentationen_US
dc.subjectMechanical stabilityen_US
dc.subjectLumbar spineen_US
dc.titleEvaluation of the Effect of Fixation Angle between Polyaxial Pedicle Screw Head and Rod on the Failure of Screw-Rod Connectionen_US
dc.relation.journalApplied Bionics And Biomechanicsen_US
dc.contributor.departmentTOBB ETU, Faculty of Engineering, Department of Mechanical Engineeringen_US
dc.contributor.departmentTOBB ETÜ, Mühendislik Fakültesi, Makine Mühendisliği Bölümütr_TR
dc.relation.tubitakTurkish Science Foundation (TUBITAK) [111M583, 113S101]en_US
dc.contributor.tobbetuauthorDemir, Teyfik
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıtr_TR

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