Publication:
Quantitative comparison of a laterally misplaced pedicle screw with a re-directed screw. How much pull-out strength is lost?

dc.contributor.coauthorŞanyılmaz, Kerim
dc.contributor.coauthorÖzkunt, Okan
dc.contributor.coauthorGemalmaz, Halil Can
dc.contributor.coauthorAkgül, Turgut
dc.contributor.coauthorSungur, Mustafa
dc.contributor.coauthorDikici, Fatih
dc.contributor.coauthorBaydoğan, Murat
dc.contributor.departmentKUH (Koç University Hospital)
dc.contributor.kuauthorKorkmaz, Murat
dc.contributor.kuprofileDoctor
dc.contributor.schoolcollegeinstituteKUH (KOÇ UNIVERSITY HOSPITAL)
dc.date.accessioned2024-11-09T13:09:50Z
dc.date.issued2018
dc.description.abstractObjective: redirecting of a laterally misplaced pedicle screw into the accurate position decreases the pull-out strength due to the reinsertion, lateral wall cortical perforation and widening of the pedicle hole. Thus, this biomechanical study was performed to quantitatively analyze the pullout strength of a redirected laterally misplaced pedicle screw into the accurate position. Methods: thirty pedicules of 15 bovine vertebrae were separated to 3 groups, according to the screw placement method: 1) standard flawless trajectory; 2) trajectory with lateral pedicle wall perforation; 3) trajectory with lateral wall perforation redirected to the standard trajectory. Samples were placed on a universal testing machine and pullout loads were measured. Kruskal-Wallis test was utilized within 95% confidence interval and p value <0.05 to test for the statistical significance. Results: the mean pullout strength was 2891 +/- 654,2 N(1383-3814,5) in Group 1; 817,8 +/- 227,6 N(308,6-1144,9) in Group 2 and 2081,1 +/- 487,7 N(1583,5-2962,5) in Group 3. The results found out to be statistically significant (p<0.05). Inter-group comparisons revealed that lateral pedicle wall perforation significantly decreases the pullout strength (p<0.05) and redirection of the screw increases the strength (p<0.05), however it was still weaker than the screws with flawless standard trajectory but this was not statistically significant (p>0.05). Conclusion: The results of this study confirm that pullout strength of pedicle screw decreases by approximately 71% when the lateral wall is perforated and decreases 28% after redirection to the accurate position.
dc.description.fulltextYES
dc.description.indexedbyWoS
dc.description.indexedbyScopus
dc.description.indexedbyTR Dizin
dc.description.indexedbyPubMed
dc.description.issue6
dc.description.openaccessYES
dc.description.publisherscopeNational
dc.description.sponsoredbyTubitakEuN/A
dc.description.sponsorshipN/A
dc.description.versionPublisher version
dc.description.volume52
dc.formatpdf
dc.identifier.doi10.1016/j.aott.2018.03.002
dc.identifier.embargoNO
dc.identifier.filenameinventorynoIR01709
dc.identifier.issn1017-995X
dc.identifier.linkhttps://doi.org/10.1016/j.aott.2018.03.002
dc.identifier.quartileQ4
dc.identifier.scopus2-s2.0-85052758705
dc.identifier.urihttps://hdl.handle.net/20.500.14288/2779
dc.identifier.wos455762800011
dc.keywordsPedicle screw placement
dc.keywordsLateral wall perforation
dc.keywordsPull-out strength
dc.keywordsFree hand technique
dc.keywordsBiomechanics
dc.languageEnglish
dc.publisherElsevier
dc.relation.grantnoNA
dc.relation.urihttp://cdm21054.contentdm.oclc.org/cdm/ref/collection/IR/id/8323
dc.sourceActa Orthopaedica et Traumatologica Turcica
dc.subjectMedicine
dc.subjectOrthopedics
dc.titleQuantitative comparison of a laterally misplaced pedicle screw with a re-directed screw. How much pull-out strength is lost?
dc.typeJournal Article
dspace.entity.typePublication
local.contributor.kuauthorKorkmaz, Murat
local.publication.orgunit1KUH (KOÇ UNIVERSITY HOSPITAL)
local.publication.orgunit2KUH (Koç University Hospital)
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relation.isParentOrgUnitOfPublication055775c9-9efe-43ec-814f-f6d771fa6dee
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