Evaluation of the Effect of Fixation Angle between Polyaxial Pedicle Screw Head and Rod on the Failure of Screw-Rod Connection
Joint Authors
Acaroglu, Emre
Çetin, Engin
Özkaya, Mustafa
Güler, Ümit Özgür
Demir, Teyfik
Source
Applied Bionics and Biomechanics
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-02-22
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
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.
American Psychological Association (APA)
Çetin, Engin& Özkaya, Mustafa& Güler, Ümit Özgür& Acaroglu, Emre& Demir, Teyfik. 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،Vol. 2015, no. 2015, pp.1-9.
https://search.emarefa.net/detail/BIM-1052165
Modern Language Association (MLA)
Çetin, Engin…[et al.]. 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 No. 2015 (2015), pp.1-9.
https://search.emarefa.net/detail/BIM-1052165
American Medical Association (AMA)
Çetin, Engin& Özkaya, Mustafa& Güler, Ümit Özgür& Acaroglu, Emre& Demir, Teyfik. 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. Vol. 2015, no. 2015, pp.1-9.
https://search.emarefa.net/detail/BIM-1052165
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1052165