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Updated: Oct 19, 2025

An Anesthesia, Surgery, and Harvest Method for the Evaluation of Transpedicular Screws Using an In Vivo Porcine Lumbar Spine Model
Published on: May 31, 2017
DIRECT PEDICLE SCREW INSERTION PULLOUT STRENGTH
Rômulo Pedroza Pinheiro1, Ariane Zamarioli1, Thibault Chandanson2
1Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Departamento de Ortopedia e Anestesiologia, Ribeirão Preto, SP, Brazil.
Objective:
Study the in vitro 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.
Methods:
DSG Screws of 5.5 mm and 6.5 mm were introduced into polyurethane blocks with a density of 10 PCF (0,16 g/cm3). 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.
Results:
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.
Conclusion:
DSG Screw showed the highest pullout strength after its insertion without pilot hole and tapping.
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