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CC BY-NC-ND 4.0 · Rev Bras Ortop (Sao Paulo) 2022; 57(02): 327-333
DOI: 10.1055/s-0041-1732390
Artigo Original
Coluna

The Influence of Thread Tap Mismatch on Pedicle Screw Pullout Strength

Article in several languages: português | English
Rômulo Pedroza Pinheiro 
1   Setor de Cirurgia da Coluna, Departamento de Ortopedia e Anestesiologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
,
Raffaello de Freitas Miranda 
1   Setor de Cirurgia da Coluna, Departamento de Ortopedia e Anestesiologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
,
Antonio Carlos Shimano 
1   Setor de Cirurgia da Coluna, Departamento de Ortopedia e Anestesiologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
,
Thibault Chandanson 
2   Département Génie Mécanique et Conception, Université de Technologie de Belfort, Montbéliard, França
,
Keri George 
3   Departamento de Bacharelado em Enfermagem, University of Calgary, Alberta, Canadá
,
Helton L.A. Defino 
1   Setor de Cirurgia da Coluna, Departamento de Ortopedia e Anestesiologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
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Abstract

Objective We aimed to study the “in vitro” pullout strength of SpineGuard/Zavation Dynamic Surgical Guidance Z-Direct Screw (DSG Screw, SpineGuard Inc, Boulder, Colorado, USA), a screw designed to be inserted using a direct insertion technique.

Methods Dynamic Surgical Guidance Screws of 5.5 and 6.5 mm were introduced into polyurethane blocks with a density of 10 PCF (0,16g/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 with line-to-line tapping.

Conclusion Dynamic Surgical Guidance Screw showed the highest pullout strength after its insertion without pilot hole and tapping.

Keywords

spinal fusion - pedicle screw - bone screws - biomechanical phenomena/physiology

Financial Support

There was no financial support from public, commercial, or non-profit sources.


Work developed at the Laboratório de Bioengenharia da Faculdade de Medicina de Ribeirão Preto da Universidade de São Paulo, Ribeirão Preto, SP, Brasil.




Publication History

Received: 05 November 2020

Accepted: 08 March 2021

Article published online:
21 January 2022

© 2022. Sociedade Brasileira de Ortopedia e Traumatologia. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commecial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

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