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Related Experiment Video

Updated: Oct 19, 2025

An Anesthesia, Surgery, and Harvest Method for the Evaluation of Transpedicular Screws Using an In Vivo Porcine Lumbar Spine Model
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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.

Acta Ortopedica Brasileira
|September 27, 2021
PubMed
Summary

The SpineGuard/Zavation Dynamic Surgical Guidance Z-Direct Screw (DSG Screw) demonstrated superior pullout strength when inserted without a pilot hole or tapping. This direct insertion technique enhances pedicle screw stability for spinal applications.

Keywords:
In Vitro TechniquesPedicle ScrewsSpinal FusionTensile Strength

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Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Spinal Implants

Background:

  • Pedicle screw fixation is a cornerstone of spinal fusion surgery.
  • Optimizing screw insertion techniques is crucial for achieving robust spinal construct stability.
  • The Dynamic Surgical Guidance Z-Direct Screw (DSG Screw) offers a novel direct insertion technique.

Purpose of the Study:

  • To evaluate the in vitro pullout strength of the DSG Screw.
  • To compare the pullout strength of the DSG Screw using different insertion techniques.
  • To determine the optimal insertion method for maximizing DSG Screw fixation.

Main Methods:

  • The study utilized polyurethane blocks (10 PCF density) to simulate bone.
  • DSG Screws (5.5 mm and 6.5 mm) were inserted using various techniques: direct insertion without pilot hole, with pilot hole without tapping, undertapping, and line-to-line tapping.
  • Pullout strength was measured using a universal testing machine.

Main Results:

  • Screws inserted directly without a pilot hole and tapping exhibited statistically significant higher pullout strength.
  • Insertion without tapping or with undertapping resulted in increased pullout strength compared to line-to-line tapping.
  • The 5.5 mm and 6.5 mm DSG Screws showed comparable performance across tested techniques.

Conclusions:

  • The DSG Screw achieves its highest pullout strength when inserted directly without a pilot hole and tapping.
  • This direct insertion technique without tapping is recommended for maximizing pedicle screw fixation.
  • The findings support the efficacy of the DSG Screw's direct insertion technique for enhanced spinal stability.