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Title: Biomechanical comparison of unilateral semi-rigid and dynamic stabilization on ovine vertebrae
Authors: Karakoyun, Dursun O.
Özkaya, Mustafa
Okutan, Volkan C.
Dalgıç, Ali
Belen, Deniz
Demir, Teyfik
Keywords: Biomechanical testing
biomedical devices
orthopedic materials
spine biomechanics
spinal implants
Issue Date: Nov-2015
Publisher: Sage Publications Ltd
Source: Karakoyun, D. O., Özkaya, M., Okutan, V. C., Dalgıç, A., Belen, D., & Demir, T. (2015). Biomechanical comparison of unilateral semi-rigid and dynamic stabilization on ovine vertebrae. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 229(11), 778-785.
Abstract: Using the unilateral pedicle screw fixation was thought to decrease the stiffness of the fixed segments. Various prospective, randomized studies were performed to determine whether unilateral pedicle screw fixation provides the necessities of bilateral fixation in one- or two-segment lumbar spinal fusion. In this study, four different unilateral pedicle screw fixation systems were evaluated to determine which one best approximated an intact spine with respect to biomechanics and kinematics. The four groups included an intact group, a unilateral facetectomy group with no fixation, a unilateral semi-rigid pedicle screw fixation group with a poly-ether-ether-ketone rod, and a unilateral dynamic pedicle screw fixation group. The bone mineral densities of all specimens were measured and specimens were matched with groups randomly. Flexion, lateral bending, and axial rotation tests were performed to compare the groups. For the flexion, lateral bending, and axial rotation tests, the best biomechanical outcomes were in the control group. The unilateral facetectomy group had the poorest performance and was not stable enough, compared with the control group. The dynamic and semi-rigid groups showed performance closer to that of the control group. The biomechanical responses of these two groups were also in good agreement, showing no significant statistical differences. Based on these test results, it is concluded that the unilateral dynamic and semi-rigid pedicle screw fixations can be used to provide stability to the vertebrae.
ISSN: 0954-4119
Appears in Collections:Makine Mühendisliği Bölümü / Department of Mechanical Engineering
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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