Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.11851/5602
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dc.contributor.authorTolunay, T.-
dc.contributor.authorArslan, K.-
dc.contributor.authorYaman, O.-
dc.contributor.authorDalbayrak, Sedat-
dc.contributor.authorDemir, Teyfik-
dc.date.accessioned2021-09-11T15:19:21Z-
dc.date.available2021-09-11T15:19:21Z-
dc.date.issued2015en_US
dc.identifier.issn2212-134X-
dc.identifier.urihttps://doi.org/10.1016/j.jspd.2014.09.055-
dc.identifier.urihttps://hdl.handle.net/20.500.11851/5602-
dc.description.abstractIntroduction Early-stage pullout is a common problem for surgeons during the fixation of osteoporotic bones. Poor bone quality limits the use of pedicle screws for patients with osteoporosis. In this study, the researchers investigated the effects of hole and gap position and type on the pullout strength of cannulated screws. Methods Seven different designs were tested, including a control group. All cannula diameters were 2 mm and holes were drilled with a diameter of 1.5 mm. Gaps were milled with a 2-mm-diameter tool with 2-mm displacement proximally. All holes and gaps were drilled or opened unilaterally and bilaterally. Grade 40 and 10 polyurethane foam was used to simulate healthy and osteoporotic bones, respectively. For pullout tests, insertion depth was 30 mm and 2-mm-diameter pilot holes were drilled into blocks before screws were inserted. The cross-head speed was 2 mm/min. For torsion tests, 1 side of the screw was fixed and other was twisted clockwise. Results For torsion tests, the maximum torque value exhibited by the control group (non-cannulated) was 14.94 Nm. The highest torsional strength among tested cannulated screws was 13.54 Nm for Single side two holes including design (S2H) (p <.0001). The minimum torsional strength was 9.45 Nm with a breaking angle of 39° (p <.005). Comparing results for samples pulled out from grade 40 polyurethane foam, single side slot including design (SS) samples exhibited the highest pullout strength with a maximum force of 3,104 N. Conclusions The unilateral, sequential, 3-radial hole, drilled, cannulated screw was the optimal alternative when considering pullout and torsional strength as criteria. © 2015 Scoliosis Research Society.en_US
dc.description.sponsorship111M583en_US
dc.language.isoenen_US
dc.publisherElsevier Inc.en_US
dc.relation.ispartofSpine Deformityen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectCement augmentationen_US
dc.subjectPedicle screw designen_US
dc.subjectPullouten_US
dc.titleBiomechanical performance of various cement-augmented cannulated pedicle screw designs for osteoporotic bonesen_US
dc.typeArticleen_US
dc.departmentFaculties, Faculty of Engineering, Department of Mechanical Engineeringen_US
dc.departmentFakülteler, Mühendislik Fakültesi, Makine Mühendisliği Bölümütr_TR
dc.identifier.volume3en_US
dc.identifier.issue3en_US
dc.identifier.startpage205en_US
dc.identifier.endpage210en_US
dc.identifier.scopus2-s2.0-84928778005en_US
dc.institutionauthorDemir, Teyfik-
dc.identifier.doi10.1016/j.jspd.2014.09.055-
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.identifier.scopusqualityQ3-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.grantfulltextnone-
item.fulltextNo Fulltext-
item.openairetypeArticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
Appears in Collections:Makine Mühendisliği Bölümü / Department of Mechanical Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
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