By Teyfik Demir, Cemile Basgül
This short booklet systematically discusses all matters that impact the pullout energy of pedicle screws. those screws are utilized in spinal surgical procedures to stabilize the backbone. The protecting energy of the pedicle screw is key for the reason that loosening of the pedicle screws could cause revision surgical procedures. as soon as the pedicle screw is pulled out, it really is tougher to procure similar stabilization for the fused vertebrae. The e-book experiences the influence of screw designs, program innovations, cement augmentation, coating of the screw and try stipulations at the pullout power. The stories with finite point research have been additionally included.
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Additional info for The Pullout Performance of Pedicle Screws
Sample text
Clin Biomech 24:613–618 9. Chen LH, Tai CL, Lee DM, Lai PL, Lee YC, Niu CC, Chen WJ (2011) Pullout strength of pedicle screws with cement augmentation in severe osteoporosis: a comparative study between cannulated screws with cement injection and solid screws with cement pre-filling. Cho W, Wu C, Zheng X, Erkan S, Suratwala SJ, Mehbod AA, Transfeldt EE (2011) Is it safe to back out pedicle screws after augmentation with polymethyl methacrylate or calcium phosphate cement? A biomechanical study.
5 cc. Thereby, the idea of higher pullout strength provided by higher cement amount was refuted. Similar results were obtained by Frankel et al. [18]. 5 ml/pedicle) through a novel fenestrated bone tap which prevents the back flow the cement on human cadaveric specimens. PMMA augmented and non-augmented groups were than subjected to axial pullout tests. However there was no significant difference on pullout strength between those two different volumes. On the other hand, limiting the cement amount with screw design is another option, which was studied [24].
7 Effect of Revision For certain cases such as surgical reasons, implant failures and metal fatigue of stabilization system, revision can be needed [30]. Revision surgeries are challenging for surgeons because the loss of vertebral bone tissues from first insertion. Expandable and cannulated screws with cement augmentation could be solutions for the revision surgeries [10, 15, 18, 28, 33, 38]. For instance, Bostan et al. [4] compared expandable pedicle screws and pedicle screws with PMMA augmentation used for revision surgeries according to their pullout strength.
