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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

Cetin, Engin; Ozkaya, Mustafa; Guler, Umit Ozgur; Acaroglu, Emre; Demir, Teyfik (Hindawi Ltd, 2015)

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 ...