BIOMECHANICAL STUDY OF PULLOUT RESISTANCE OF CORTICAL SCREWS IN SWINE LUMBAR VERTEBRAE.

IF 0.6 4区医学 Q4 ORTHOPEDICS

Acta Ortopedica Brasileira Pub Date : 2026-09-25 eCollection Date: 2026-01-01 DOI:10.1590/1413-785220263402e297893

Rogério Lúcio Chaves de Resende, Jefferson Soares Leal, Jefferson J Vilela, Renato de Mello Guimarães, Ângelo Ribeiro Vaz de Faria, Marco Antônio Percope de Andrade

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引用次数: 0

Abstract

Introduction: This study aimed to evaluate the mechanical resistance to pullout of the lumbar cortical bone trajectory (CBT) screw with and without transfixation of the second cortical in a biomechanical assay in swine vertebrae.

Methods: A pullout test was performed in 16 swine vertebrae (L5 and L6) fixed with 32 CBT screws using the same protocol. Of these, 16 were inserted in a monocortical manner according to the original technique and 16 through a modified technique which included the transfixation of the second cortical bone.

Results: The average maximum load value for pulling out the inserted screws with the modified technique including the transfixation of the second cortical bone was 140.50 Kgf (± 56.56), while in the original technique it was 95.69 Kgf (± 42.19) (p = 0.004).

Conclusion: The biomechanical tests applied to the studied sample showed that the pullout resistance of the CBT screws inserted with the bicortical technique was, on average, 46% higher than the screws inserted according to the original monocortical technique. Level of Evidence II; Experimental study.

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猪腰椎皮质螺钉抗拔的生物力学研究。

简介：本研究旨在通过猪椎骨的生物力学试验，评估有和没有穿固定第二皮质的腰椎皮质骨轨迹（CBT）螺钉拔出的机械阻力。方法：采用相同的方案，用32枚CBT螺钉固定16根猪椎体（L5和L6），进行拉出试验。其中，16例按照原始技术以单皮质方式插入，16例通过一种改进的技术，包括穿透第二皮质骨。结果：改良技术包括第二皮质骨内穿固定的内钉拔出的平均最大载荷值为140.50 Kgf（±56.56），而原始技术为95.69 Kgf（±42.19）（p = 0.004）。结论：应用于研究样本的生物力学试验表明，采用双皮质技术置入CBT螺钉的拔出阻力平均比采用原始单皮质技术置入的螺钉高46%。证据水平II；实验研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta Ortopedica Brasileira Orthopedics-

CiteScore

0.90

自引率

14.30%

发文量

审稿时长

25 weeks

期刊介绍： A Revista Acta Ortopédica Brasileira, órgão oficial do Departamento de Ortopedia e Traumatologia da Faculdade de Medicina da Universidade de São Paulo (DOT/FMUSP), é publicada bimestralmente em seis edições ao ano (jan/fev, mar/abr, maio/jun, jul/ago, set/out e nov/dez) com versão em inglês disponível nos principais indexadores nacionais e internacionais e instituições de ensino do Brasil. Sendo hoje reconhecidamente uma importante contribuição para os especialistas da área com sua seriedade e árduo trabalho para as indexações já conquistadas.