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• W2617606212 abstract "Screw loosening has been reported for non-fusion devices. Forces on pedicle screws could be related to kinematic parameters as the interpedicular displacement (ID), which consists of the displacement between superior and inferior screw heads from full extension to full flexion. To investigate the relationship between ID and screw loosening for different designs of posterior implants using a finite element model. An L3-sacrum previously validated spine FE model was used. Three-rod designs were considered in L4-L5 segment: a rigid screw-rod implant, a flexible one and a specific design with a sliding rod providing limited restrain in ID. In order to simulate intermediate configurations, the friction coefficient between the sliding rods and connectors were varied. The sacrum was rigidly fixed. Rotations (flexion-extension, lateral bending and axial rotation) were applied to L3, for each modeled configuration: intact, injured, injured with different implants. Model consistency was checked with existing experimental in vitro data on intact and instrumented segments. Screw loads were computed as well as ID. In flexion-extension, the ID was less than 2 mm for rigid (R) and flexible (F) constructs and 5.5 mm for intact spine and the sliding implant (S3). Screw's shear forces were 272 N, 153 N, 43 N respectively for R, F and S3 constructs. Implants that allow ID presented lower screws loads. A compromise between the ability of the implant to withstand compressive forces, which requires longitudinal stiffness, and its ability to allow ID could be important for future implant designs in order to prevent screw loosening." @default.
• W2617606212 created "2017-06-05" @default.
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• W2617606212 creator A5051583715 @default.
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• W2617606212 date "2017-09-01" @default.
• W2617606212 modified "2023-09-30" @default.
• W2617606212 title "Limiting interpedicular screw displacement increases shear forces in screws: A finite element study" @default.
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• W2617606212 doi "https://doi.org/10.1016/j.otsr.2017.05.004" @default.
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