1
40
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Text
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URL Address
<a href="http://doi.org/10.1097/ta.0b013e318169cd71" target="_blank" rel="noreferrer noopener">http://doi.org/10.1097/ta.0b013e318169cd71</a>
Pages
1302–1307
Issue
5
Volume
64
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Pullout strength and load to failure properties of self-tapping cortical screws in synthetic and cadaveric environments representative of healthy and osteoporotic bone.
Publisher
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Journal of Trauma
Date
A point or period of time associated with an event in the lifecycle of the resource
2008
2008-05
Subject
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Equipment Design; Cadaver; Osteoporosis; Human; Stress; Biological; Models; Mechanical; Orthopedic Fixation Devices; Biomechanics; Bone Substitutes; Materials Testing – Methods
Creator
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Schoenfeld A J; Battula S; Sahai V; Vrabec GA; Corman S; Burton L; Njus GO
Description
An account of the resource
BACKGROUND: The parameters of self-tapping screw (STS) performance in normal and osteoporotic bone have been defined in representative environments, but the question remains as to the clinical application of such findings. The goal of this study was to analyze the biomechanical performance of STSs in cadaveric and synthetic environments representative of healthy and osteoporotic bone. METHODS: Ninety-six Synthes STSs were inserted into cadaveric and synthetic models representative of osteoporotic and healthy bone. Screws were inserted to depths of 1 mm short of the far cortex, flush and 1 mm and 2 mm beyond the far cortex. Screws were tested with an Instron 8511 material testing system utilizing axial pullout forces. A SAS procedure was used to conduct analysis of variance for unbalanced datasets. RESULTS: Substantial differences were appreciated with respect to screw performance between osteoporotic and healthy bone specimens. Although a similar pattern of increased pullout strength and loading energy with increasing depth of insertion was demonstrated, absolute values were lower in osteoporotic specimens. Although performance trends were similar in cadaveric and synthetic testing models for both osteoporotic and healthy bone, values obtained during testing were different. Incomplete insertion of STSs resulted in a 21.5% and 37% reduction of biomechanical properties in osteoporotic and normal bone, respectively. CONCLUSIONS: These results indicate that previously published findings on the performance of STSs in synthetic models cannot reasonably be applied to the clinical realm. Although trends may be similar, screw performance in synthetic, as compared with cadaveric, models is markedly different.
Identifier
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<a href="http://doi.org/10.1097/ta.0b013e318169cd71" target="_blank" rel="noreferrer noopener">10.1097/ta.0b013e318169cd71</a>
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Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
2008
Battula S
Biological
biomechanics
Bone Substitutes
Burton L
Cadaver
Corman S
Equipment Design
Human
Journal of Trauma
Materials Testing – Methods
Mechanical
Models
Njus GO
Orthopedic Fixation Devices
Osteoporosis
Sahai V
Schoenfeld A J
Stress
Vrabec GA
-
Text
A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.
URL Address
<a href="http://doi.org/10.1097/TA.0b013e31802bf051" target="_blank" rel="noreferrer noopener">http://doi.org/10.1097/TA.0b013e31802bf051</a>
Rights
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
Pages
990-995
Issue
4
Volume
64
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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The effect of pilot hole size on the insertion torque and pullout strength of self-tapping cortical bone screws in osteoporotic bone
Publisher
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Journal of Trauma-Injury Infection and Critical Care
Date
A point or period of time associated with an event in the lifecycle of the resource
2008
2008-04
Subject
The topic of the resource
Surgery; osteoporosis; General & Internal Medicine; biomechanical testing; pilot; holding power; hole size; insertion torque; pullout strength; self-tapping cortical screws
Creator
An entity primarily responsible for making the resource
Battula S; Schoenfeld A J; Sahai V; Vrabec G A; Tank J; Njus G O
Description
An account of the resource
Background: All surgical screws can experience failure if the torsional, tensile, and flexion loads exerted on the screws are excessively high. The use of self-tapping screws (STS) results in higher insertion torques (IT) as these screws cut their own threads in the pilot hole drilled in the bone. In this study, the torque for inserting the STS into an osteoporotic bone block for different pilot hole sizes (PHS) was measured and the pullout strength (PS) for extraction of the screws was determined for different depths of insertion, 0 mm, 1 mm, and 2 mm beyond the far cortex. Methods: Seventy-two Synthes stainless steel STS (40 mm length and 3.5 mm diameter) were inserted into pilot holes of sizes 2.55 (A: 73% OD), 2.50 (B: 71.5%), 2.45 (C: 70 %), and 2.8 mm (D: 80 %). Using a digital torque screwdriver, screws were inserted to 0 mm, 1 mm or 2 mm past the far cortex. Pullout tests were conducted with an Instron materials testing system. Analysis of variance,and Student-Neuman-Keuls tests were performed to determine the effect of DOI and PHS on the loading energy, PS, and IT. Results: Results demonstrated that IT of the screws inserted into pilot holes A, B, and C were higher than those in D. It was also observed that PS and loading energy for 1 rum and 2 mm penetration past the far cortex were higher than those for 0 mm regardless of PHS. This study also found that an increase in PHS to 2.8 mm will reduce IT but will also reduce the PS relative to a PHS of 2.5 mm, the current standard for 3.5 mm screws. Conclusions: The results of previously published studies regarding the effect of pilot hole size on PS in healthy cortical bone cannot be applied to the osteoporotic environment. The findings presented in this research support using PHS no larger than 71.5% of the screw outer diameter (i.e., pilot hole size of 2.5 mm for 3.5 mm screws) and inserting screws at least 2 mm beyond the far cortex to maximize PS and minimize iatrogenic damage in osteoporotic bone.
Identifier
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<a href="http://doi.org/10.1097/TA.0b013e31802bf051" target="_blank" rel="noreferrer noopener">10.1097/TA.0b013e31802bf051</a>
Format
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Journal Article or Conference Abstract Publication
2008
Battula S
biomechanical testing
General & Internal Medicine
holding power
hole size
insertion torque
Journal Article or Conference Abstract Publication
Journal of Trauma-Injury Infection and Critical Care
Njus G O
Osteoporosis
pilot
pullout strength
Sahai V
Schoenfeld A J
self-tapping cortical screws
Surgery
Tank J
Vrabec G A