DIRECT PEDICLE SCREW INSERTION PULLOUT STRENGTH

Study the pullout strength of SpineGuard/Zavation Dynamic Surgical Guidance Z-Direct Screw (DSG Screw), a screw pedicle designed to be inserted using a direct insertion technique. DSG Screws of 5.5 mm and 6.5 mm were introduced into polyurethane blocks with a density of 10 PCF (0,16 g/cm ). Accordin...

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Bibliographic Details
Published in:Acta ortopedica brasileira 2021-08, Vol.29 (4), p.203-206
Main Authors: Pinheiro, Rômulo Pedroza, Zamarioli, Ariane, Chandanson, Thibault, George, Keri, Shimano, Antonio Carlos, Defino, Helton Luiz Aparecido
Format: Article
Language:English
Subjects:
In Vitro Techniques
Original
ORTHOPEDICS
Pedicle Screws
Spinal Fusion
Tensile Strength
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Summary:Study the pullout strength of SpineGuard/Zavation Dynamic Surgical Guidance Z-Direct Screw (DSG Screw), a screw pedicle designed to be inserted using a direct insertion technique. DSG Screws of 5.5 mm and 6.5 mm were introduced into polyurethane blocks with a density of 10 PCF (0,16 g/cm ). According to the experimental group, screws were inserted without pilot hole, with pilot without tapping, undertapping and line-to-line tapping. Screw pullout tests were performed using a universal test machine after screw insertion into polyurethane blocks. Screws inserted directly into the polyurethane blocks without pilot hole and tapping showed a statistically higher pullout strength. Insertion of the screw without tapping or with undertapping increases the pullout screw strength compared to line-to-line tapping. DSG Screw showed the highest pullout strength after its insertion without pilot hole and tapping.
ISSN:1413-7852
1809-4406
1809-4406
DOI:10.1590/1413-785220212904241648