Document Type
Article
Publication Date
12-1-2009
Department
Mechanical Engineering
Abstract
Objectives: Different techniques and choices exist for revision of pedicle screws, two of which are pedicle screw combined with cement augmentation and expansive pedicle screw fixation. This biomechanical study was designed to compare the pullout strengths of two different revision techniques. Methods: Fourteen lumbar vertebrae obtained from four calves (mean age 15 months) were divided into two groups equal in number. Monoaxial 6.0-mm pedicle screws were inserted into the right pedicles, and axial pullout testing was performed at a rate of 10 mm/min and failure strengths were recorded. Revision was performed with the same-sized pedicle screws reinforced with polymethyl-methacrylate in group 1, and with 7.0-mm expansive pedicle screws in group 2, and pullout testing was repeated to record maximum revision pullout strengths. Results: The mean pullout strengths recorded before and after revision were significantly different in both groups, being 2,162.9±718.5 N and 2,794.3±979.2 N in group 1 (p=0.041) and 2,605.0±487.6 N and 3,327.1±640.8 N in group 2 (p=0.012), respectively. However, the mean pullout strengths recorded before and after revision did not differ significantly between the two groups (p>0.05). Conclusion: Our results showed that expansive pedicle screws 1 mm larger in diameter provide similar pullout strengths to those of same-sized, polymethylmethacrylate-reinforced screws in revision of pedicle screw fixation, suggesting that they can be preferred with the additional advantages of ease of application and avoiding risks for pedicle fracture and cement leakage. © 2009 Turkish Association of Orthopaedics and Traumatology.
DOI
10.3944/AOTT.2009.272
First Page
272
Last Page
276
Publication Title
Acta Orthopaedica et Traumatologica Turcica
Recommended Citation
Bostan, Bora; Esenkaya, Irfan; Gunes, Taner; Erdem, Mehmet; Asci, Murat; Kelestemur, Mehmet Halidun; and Sen, Cengiz, "A biomechanical comparison of polymethylmethacrylate-reinforced and expansive pedicle screws in pedicle-screw revisions" (2009). Faculty Publications - Mechanical Engineering. 109.
https://orc.library.atu.edu/faculty_pub_mech/109
Comments
At the time of publication, Mehmet Halidun Kelestemur was affiliated with Firat Üniversitesi.
Original article published in Turkish.
This is an open access article.
Original Citation:
Bostan, B., Esenkaya, I., Gunes, T., Erdem, M., Asci, M., Kelestemur, M. H., & Sen, C. (2009). A biomechanical comparison of polymethylmethacrylate-reinforced and expansive pedicle screws in pedicle-screw revisions. Acta Orthopaedica et Traumatologica Turcica 43(3): 272-276. doi: 10.3944/AOTT.2009.272.