A influência da incompatibilidade do macho de rosca na resistência à extração do parafuso pedicular

Rômulo Pedroza Pinheiro; Raffaello de Freitas Miranda; Antonio Carlos Shimano; Thibault Chandanson; Keri George; Helton L.A. Defino

doi:10.1055/s-0041-1732390

Revista Brasileira de Ortopedia, Table of Contents

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

¹Setor 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

¹Setor 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

¹Setor 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

²Département Génie Mécanique et Conception, Université de Technologie de Belfort, Montbéliard, França

,

Keri George

³Departamento de Bacharelado em Enfermagem, University of Calgary, Alberta, Canadá

,

Helton L.A. Defino

¹Setor de Cirurgia da Coluna, Departamento de Ortopedia e Anestesiologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil

› Author Affiliations

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

Full Text

References

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