Abstract
Background The pedicle screw fixation system is the gold standard treated method in clinical for the unstable disease. Generally, pedicle screw can be classified into two categories included monoaxial and polyaxial constructions. Although the polyaxial screws were common used owing to it can provide more degree of freedom on the screw-to-rod connection to facilitate rod seating. However, the complexity of structural design may reduce their mechanical strength. The size of slicing spheres of polyaxial screw head was found as the important issue to influence the mechanical strength of the pedicle screw system. Therefore, this study investigated the effects of different size of slicing spheres of polyaxial screw head on the vertebrectomy model under compression test. Material and Method The different size (60, 75 and 90% diameter) of slicing spheres of polyaxial screw head were assembled for destructive mechanical testing. All pedicle screw systems assemblies were tested in compression test according to FDA regulation testing method of ASTM F1717. The stiffness and ultimate load were determined for different slicing spheres of screws. Result and discussion The results of testing found that stiffness were 10.91 ± 2.03, 19.34 ± 1.21, and 23.39 ± 0.85 N/mm and ultimate loads were 185.43 ± 14.57, 264.44 ± 21.68, and 364.54 ± 10.43 N for 60, 75, and 90% diameter, respectively. Significant differences (p < 0.05) were found among these three groups. Conclusion The mechanical strength presented by stiffness and ultimate load increased as the size of slicing spheres of polyaxial screw head increased.
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References
Kuklo, T.R., Potter, B.K., Polly Jr., D.W., Lenke, L.G.: Monaxial versus multiaxial thoracic pedicle screws in the correction of adolescent idiopathic scoliosis. Spine (Phila Pa 1976) 30, 2113–2120 (2005)
Vora, V., Crawford, A., Babekhir, N., Boachie-Adjei, O., Lenke, L., Peskin, M., Charles, G., Kim, Y.: A pedicle screw construct gives an enhanced posterior correction of adolescent idiopathic scoliosis when compared with other constructs: myth or reality. Spine (Phila Pa 1976) 32, 1869–1874 (2007)
Rose, P.S., Lenke, L.G., Bridwell, K.H., Mulconrey, D.S., Cronen, G.A., Buchowski, J.M., Schwend, R.M., Sides, B.A.: Pedicle screw instrumentation for adult idiopathic scoliosis: an improvement over hook/hybrid fixation. Spine (Phila Pa 1976) 34, 852–857 (discussion 858) (2009)
Cetin, E., Ozkaya, M., Guler, U.O., Acaroglu, E., Demir, T.: Evaluation of the effect of fixation angle between polyaxial pedicle screw head and rod on the failure of screw-rod connection. Appl. Bion. Biomech. 2015, 150649 (2015)
Wang, H., Li, C., Liu, T., Zhao, W.D., Zhou, Y.: Biomechanical efficacy of monoaxial or polyaxial pedicle screw and additional screw insertion at the level of fracture, in lumbar burst fracture: an experimental study. Indian J. Orthop. 46, 395–401 (2012)
Voleti, P.B., Shen, F.H., Arlet, V.: Failure of monoaxial pedicle screws at the distal end of scoliosis constructs: a case series. Spine Deform. 2, 110–121 (2014)
Wang, X., Aubin, C.E., Crandall, D., Parent, S., Labelle, H.: Biomechanical analysis of 4 types of pedicle screws for scoliotic spine instrumentation. Spine (Phila Pa 1976) 37, E823–835 (2012)
Serhan, H., Hammerberg, K., O’Neil, M., Sturm, P., Mardjetko, S., Crawford, A.: Intraoperative techniques to reduce the potential of set-screw loosening in long spinal constructs: a static and fatigue biomechanical investigation. J. Spinal Disord. Tech. 23, e31–e36 (2010)
Essig, D.A., Miller, C.P., Xiao, M., Ivancic, P., Jegede, K., Badrinath, R., Smith, B.G., Grauer, J.N.: Biomechanical comparison of endplate forces generated by uniaxial screws and monoaxial pedicle screws. Orthopedics 35, e1528–e1532 (2012)
Fogel, G.R., Reitman, C.A., Liu, W., Esses, S.I.: Physical characteristics of polyaxial-headed pedicle screws and biomechanical comparison of load with their failure. Spine (Phila Pa 1976) 28, 470–473 (2003)
Schroerlucke, S.R., Steklov, N., Mundis Jr., G.M., Marino, J.F., Akbarnia, B.A., Eastlack, R.K.: How does a novel monoplanar pedicle screw perform biomechanically relative to monoaxial and polyaxial designs? Clin. Orthop. Relat. Res. 472, 2826–2832 (2014)
Stanford, R.E., Loefler, A.H., Stanford, P.M., Walsh, W.R.: Multiaxial pedicle screw designs: static and dynamic mechanical testing. Spine (Phila Pa 1976) 29, 367–375 (2004)
Glassman, S.D., Berven, S., Bridwell, K., Horton, W., Dimar, J.R.: Correlation of radiographic parameters and clinical symptoms in adult scoliosis. Spine (Phila Pa 1976) 30, 682–688 (2005)
Lazennec, J.Y., Ramare, S., Arafati, N., Laudet, C.G., Gorin, M., Roger, B., Hansen, S., Saillant, G., Maurs, L., Trabelsi, R.: Sagittal alignment in lumbosacral fusion: relations between radiological parameters and pain. Eur. Spine J. 9, 47–55 (2000)
Park, P., Garton, H.J., Gala, V.C., Hoff, J.T., McGillicuddy, J.E.: Adjacent segment disease after lumbar or lumbosacral fusion: review of the literature. Spine (Phila Pa 1976) 29, 1938–1944 (2004)
Acknowledgements
This work was kindly supported by grants CRRPG3E0141 and CRRPG3E0142 from Chang Gung Memorial Hospital, and grant MOST 105-2622-8-010-001-TE4 from Ministry of Science and Technology, Taiwan.
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Liu, PY. et al. (2018). The Effect of Different Size of Slicing Spheres of Polyaxial Screw Head on Static Compression Mechanical Test. In: Ibrahim, F., Usman, J., Ahmad, M., Hamzah, N., Teh, S. (eds) 2nd International Conference for Innovation in Biomedical Engineering and Life Sciences. ICIBEL 2017. IFMBE Proceedings, vol 67. Springer, Singapore. https://doi.org/10.1007/978-981-10-7554-4_10
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