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• W2325407271 abstract "In Brief Study Design. Experimental and finite element analysis of anterior lumbar interbody fixation (ALIF) plate pullout. Objective. The objective of this study was to determine the effect of screw angle and orientation on ALIF plate pullout strength. Summary of Background Data. It has been thought that angling the screws in an ALIF plate leads to better fixation strength; however, a few studies are published on this question, which produced conflicting results. Methods. Using custom guides, screws were configured in 9 different orientations to affix ALIF plates to polyurethane foam blocks. Pullout tests were performed at a rate of 1 mm/min. In addition, finite element analyses were performed on a 2-dimensional screw-block model to gain insight into the internal stress during pullout. Results. The pullout load was the greatest, with screws positioned 12° outward sagittaly and 6° inward coronally (936 ± 72 N). This orientation was statistically greater than the orientation with the lowest pullout load (812 ± 45 N, P < 0.05); however, no group was statistically different than placing the screws straight in (868 ± 86 N, P > 0.05). Finite elements analysis showed some gain in pullout strength at 12° followed by some loss at greater angles. As the screw insertion angle increased, stress levels elevated within the block even in the regions away from the screw. Conclusion. Significant difference was found between certain screw-angle configurations; however, when compared with simply placing the screws straight in, the difference was never more than 8%. This implies that there is greater freedom in the angle and placement of screws than previously thought. Our results show that there is little change in fixation strength when placing the screw in a different direction. This study determined the effect of screw angle on anterior lumbar interbody fixation plate pullout, using pullout tests on a polyurethane foam model and finite elements analysis. Certain angles were significantly stronger than others; however, no orientation was statistically different than placing the screws straight in." @default.
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• W2325407271 date "2012-07-01" @default.
• W2325407271 modified "2023-10-03" @default.
• W2325407271 title "Pullout Analysis of a Lumbar Plate With Varying Screw Orientations" @default.
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• W2325407271 doi "https://doi.org/10.1097/brs.0b013e318254155a" @default.
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