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• W2163767701 abstract "Background context Extrapedicular screws are placed more laterally than intrapedicular screws and pass through the transverse process or rib head before entering the vertebral body. These screws are sometimes placed to salvage failed pedicle screws, but the change in pullout resistance of extrapedicular screws after salvage has not been quantified. Purpose To quantify the pullout resistance of thoracic extrapedicular screws compared with intrapedicular screws and the pullout resistance of newly inserted screws compared with extrapedicular screws used as salvage for failed intrapedicular screws. Study design In vitro paired comparison of screw pullout resistance in isolated thoracic vertebrae. Methods Tapered monoaxial pedicle screws were inserted in the left or right pedicle of 11 human cadaveric thoracic vertebrae. An extrapedicular screw was inserted on the contralateral side. Both screws were pulled out axially at 0.5 mm/s using a servohydraulic test frame while applied load was recorded. Then a fresh extrapedicular screw was inserted as a salvage screw on the intrapedicular screw side and pulled out. Results In uncompromised vertebrae, the pullout strength of extrapedicular screws was 80±32% of that of intrapedicular screws (p=.073, repeated-measures one-way analysis of variance/Tukey). Salvage screws restored pullout strength to 65±30% of that of intrapedicular screws (p=.003). Conclusions Extrapedicular screws provided comparable but slightly lower pullout resistance to intrapedicular screws in uncompromised vertebrae. They are therefore a feasible salvage technique when a compromised pedicle precludes reinsertion of an intrapedicular screw, but the salvage screw is significantly weaker than the original screw." @default.
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• W2163767701 date "2007-05-01" @default.
• W2163767701 modified "2023-09-24" @default.
• W2163767701 title "Pullout resistance of thoracic extrapedicular screws used as a salvage procedure" @default.
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• W2163767701 doi "https://doi.org/10.1016/j.spinee.2005.12.007" @default.
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