Biomechanical Comparison of Fixation Stability among Various Pedicle Screw Geometries: Effects of Screw Outer/Inner Projection Shape and Thread Profile

The proper screw geometry and pilot-hole size remain controversial in current biomechanical studies. Variable results arise from differences in specimen anatomy and density, uncontrolled screw properties and mixed screw brands, in addition to the use of different tapping methods. The purpose of this...

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Autores principales:	Ming-Kai Hsieh, Yun-Da Li, Mu-Yi Liu, Chen-Xue Lin, Tsung-Ting Tsai, Po-Liang Lai, Ching-Lung Tai
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	pedicle screw screw loosening pilot hole bone density Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/098d55ae237940429eaf99461cbbda30
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spelling	oai:doaj.org-article:098d55ae237940429eaf99461cbbda302021-11-11T15:00:15ZBiomechanical Comparison of Fixation Stability among Various Pedicle Screw Geometries: Effects of Screw Outer/Inner Projection Shape and Thread Profile10.3390/app112199012076-3417https://doaj.org/article/098d55ae237940429eaf99461cbbda302021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/9901https://doaj.org/toc/2076-3417The proper screw geometry and pilot-hole size remain controversial in current biomechanical studies. Variable results arise from differences in specimen anatomy and density, uncontrolled screw properties and mixed screw brands, in addition to the use of different tapping methods. The purpose of this study was to evaluate the effect of bone density and pilot-hole size on the biomechanical performance of various pedicle screw geometries. Six screw designs, involving three different outer/inner projections of screws (cylindrical/conical, conical/conical and cylindrical/cylindrical), together with two different thread profiles (square and V), were examined. The insertional torque and pullout strength of each screw were measured following insertion of the screw into test blocks, with densities of 20 and 30 pcf, predrilled with 2.7-mm/3.2-mm/3.7-mm pilot holes. The correlation between the bone volume embedded in the screw threads and the pullout strength was statistically analyzed. Our study demonstrates that V-shaped screw threads showed a higher pullout strength than S-shaped threads in materials of different densities and among different pilot-hole sizes. The configuration, consisting of an outer cylindrical shape, an inner conical shape and V-shaped screw threads, showed the highest insertional torque and pullout strength at a normal and higher-than-normal bone density. Even with increasing pilot-hole size, this configuration maintained superiority.Ming-Kai HsiehYun-Da LiMu-Yi LiuChen-Xue LinTsung-Ting TsaiPo-Liang LaiChing-Lung TaiMDPI AGarticlepedicle screwscrew looseningpilot holebone densityTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 9901, p 9901 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	pedicle screw screw loosening pilot hole bone density Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	pedicle screw screw loosening pilot hole bone density Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Ming-Kai Hsieh Yun-Da Li Mu-Yi Liu Chen-Xue Lin Tsung-Ting Tsai Po-Liang Lai Ching-Lung Tai Biomechanical Comparison of Fixation Stability among Various Pedicle Screw Geometries: Effects of Screw Outer/Inner Projection Shape and Thread Profile
description	The proper screw geometry and pilot-hole size remain controversial in current biomechanical studies. Variable results arise from differences in specimen anatomy and density, uncontrolled screw properties and mixed screw brands, in addition to the use of different tapping methods. The purpose of this study was to evaluate the effect of bone density and pilot-hole size on the biomechanical performance of various pedicle screw geometries. Six screw designs, involving three different outer/inner projections of screws (cylindrical/conical, conical/conical and cylindrical/cylindrical), together with two different thread profiles (square and V), were examined. The insertional torque and pullout strength of each screw were measured following insertion of the screw into test blocks, with densities of 20 and 30 pcf, predrilled with 2.7-mm/3.2-mm/3.7-mm pilot holes. The correlation between the bone volume embedded in the screw threads and the pullout strength was statistically analyzed. Our study demonstrates that V-shaped screw threads showed a higher pullout strength than S-shaped threads in materials of different densities and among different pilot-hole sizes. The configuration, consisting of an outer cylindrical shape, an inner conical shape and V-shaped screw threads, showed the highest insertional torque and pullout strength at a normal and higher-than-normal bone density. Even with increasing pilot-hole size, this configuration maintained superiority.
format	article
author	Ming-Kai Hsieh Yun-Da Li Mu-Yi Liu Chen-Xue Lin Tsung-Ting Tsai Po-Liang Lai Ching-Lung Tai
author_facet	Ming-Kai Hsieh Yun-Da Li Mu-Yi Liu Chen-Xue Lin Tsung-Ting Tsai Po-Liang Lai Ching-Lung Tai
author_sort	Ming-Kai Hsieh
title	Biomechanical Comparison of Fixation Stability among Various Pedicle Screw Geometries: Effects of Screw Outer/Inner Projection Shape and Thread Profile
title_short	Biomechanical Comparison of Fixation Stability among Various Pedicle Screw Geometries: Effects of Screw Outer/Inner Projection Shape and Thread Profile
title_full	Biomechanical Comparison of Fixation Stability among Various Pedicle Screw Geometries: Effects of Screw Outer/Inner Projection Shape and Thread Profile
title_fullStr	Biomechanical Comparison of Fixation Stability among Various Pedicle Screw Geometries: Effects of Screw Outer/Inner Projection Shape and Thread Profile
title_full_unstemmed	Biomechanical Comparison of Fixation Stability among Various Pedicle Screw Geometries: Effects of Screw Outer/Inner Projection Shape and Thread Profile
title_sort	biomechanical comparison of fixation stability among various pedicle screw geometries: effects of screw outer/inner projection shape and thread profile
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/098d55ae237940429eaf99461cbbda30
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Biomechanical Comparison of Fixation Stability among Various Pedicle Screw Geometries: Effects of Screw Outer/Inner Projection Shape and Thread Profile

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