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椎弓根螺钉表面对植入扭矩和拔出强度的作用。

The Role of Pedicle Screw Surface on Insertion Torque and Pullout Strength.

作者信息

Fleury Rodrigo Barra Caiado, Shimano Antônio Carlos, Matos Thiago Dantas, Teixeira Kelsen de Oliveira, Romero Valéria, Defino Helton Luiz Aparecido

机构信息

Curso de Pós-Graduação, Departamento de Biomecânica, Medicina e Reabilitação do Aparelho Locomotor, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil.

Departamento de Biomecânica, Medicina e Reabilitação do Aparelho Locomotor, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil.

出版信息

Rev Bras Ortop (Sao Paulo). 2020 Dec;55(6):695-701. doi: 10.1055/s-0040-1710072. Epub 2020 Jun 8.

DOI:10.1055/s-0040-1710072
PMID:33364646
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7748926/
Abstract

Compare by mechanical tests the pullout resistance and the insertion torque of rough and smooth pedicle screws.  Pedicle screws with rough surface and smooth surface, with diameters of 4.8; 5.5 and 6.5 mm, were inserted in polyurethane blocks with density of 10 PCF (0.16 g/cm3). Insertion torque and pullout strength were assessed.  The pullout strength of the rough surface and smooth surface screws did not differ, except in the group of 4.8 mm diameter screws. In this group, the rough surface screws showed greater resistance to pullout.  Pedicle screws with a rough surface did not show increased pullout resistance in the acute phase of their insertion in polyurethane blocks compared to smooth surface screws. The rough surface screws had a higher insertion torque than the smooth surface screws, depending on the diameter of the screw and the preparation of the pilot hole.

摘要

通过机械测试比较粗糙和光滑椎弓根螺钉的拔出阻力和插入扭矩。 将直径为4.8、5.5和6.5毫米的粗糙表面和光滑表面的椎弓根螺钉插入密度为10 PCF（0.16克/立方厘米）的聚氨酯块中。评估插入扭矩和拔出强度。 除了直径为4.8毫米的螺钉组外，粗糙表面和光滑表面螺钉的拔出强度没有差异。在该组中，粗糙表面螺钉显示出更大的抗拔出能力。 与光滑表面螺钉相比，粗糙表面的椎弓根螺钉在插入聚氨酯块的急性期并未显示出增加的拔出阻力。根据螺钉直径和引导孔的制备情况，粗糙表面螺钉的插入扭矩高于光滑表面螺钉。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4261/7748926/437e74150b6d/10-1055-s-0040-1710072-i1900154en-3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4261/7748926/90cd2536b1dc/10-1055-s-0040-1710072-i1900154en-2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4261/7748926/437e74150b6d/10-1055-s-0040-1710072-i1900154en-3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4261/7748926/90cd2536b1dc/10-1055-s-0040-1710072-i1900154en-2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4261/7748926/437e74150b6d/10-1055-s-0040-1710072-i1900154en-3.jpg

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Mechanical stability of a novel screw design after repeated insertion: can the double-thread screw serve as a back up?新型螺钉在反复插入后的力学稳定性：双螺纹螺钉能否作为备用方案？
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