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pubmed-article:10398023pubmed:abstractTextThe aim of this study was to compare an in vitro versus an ex vivo experimental model to test the insertion torque of two different types of external fixation pins. A torque measuring machine was developed in order to perform accurate measurements. Forty tapered pins made of stainless steel were utilized. Half of the pins were plasma-spray coated with hydroxyapatite (HA) and the other half remained uncoated. For the in vitro model 20 cylinders were used that were made of synthetic polymer according to ASTM standards. For the ex vivo model 10 fresh femora harvested from adult sheep were used. All the pins were implanted after predrilling, and insertion torque was measured. Statistical analysis of the in vitro versus the ex vivo model showed significant differences in both coated (p < 0. 0005) and uncoated (p = 0.002) external fixation pins. These results may be due to the surface roughness that caused significant friction between the HA coating and the polyvinylchloride in the in vitro model. The significant difference between the in vitro and ex vivo results lead us to state that the in vitro model does not realistically simulate the behavior of external fixation pins implanted in bone.lld:pubmed
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pubmed-article:10398023pubmed:statusMEDLINElld:pubmed
pubmed-article:10398023pubmed:issn0021-9304lld:pubmed
pubmed-article:10398023pubmed:authorpubmed-author:RoccaMMlld:pubmed
pubmed-article:10398023pubmed:authorpubmed-author:FiniMMlld:pubmed
pubmed-article:10398023pubmed:authorpubmed-author:MoroniAAlld:pubmed
pubmed-article:10398023pubmed:authorpubmed-author:GiardinoRRlld:pubmed
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pubmed-article:10398023pubmed:authorpubmed-author:GuzzardellaMMlld:pubmed
pubmed-article:10398023pubmed:copyrightInfoCopyright 1999 John Wiley & Sons, Inc.lld:pubmed
pubmed-article:10398023pubmed:issnTypePrintlld:pubmed
pubmed-article:10398023pubmed:volume48lld:pubmed
pubmed-article:10398023pubmed:ownerNLMlld:pubmed
pubmed-article:10398023pubmed:authorsCompleteYlld:pubmed
pubmed-article:10398023pubmed:pagination216-9lld:pubmed
pubmed-article:10398023pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:10398023pubmed:year1999lld:pubmed
pubmed-article:10398023pubmed:articleTitleMeasurement of insertion torque of tapered external fixation pins: A comparison between two experimental models.lld:pubmed
pubmed-article:10398023pubmed:affiliationExperimental Surgery Department, Rizzoli Orthopaedic Institutes, University of Bologna, Bologna, Italy.lld:pubmed
pubmed-article:10398023pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10398023pubmed:publicationTypeComparative Studylld:pubmed