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Article: Biomechanical effects of insertion location and bone cement augmentation on the anchoring strength of iliac screw

TitleBiomechanical effects of insertion location and bone cement augmentation on the anchoring strength of iliac screw
Authors
Issue Date2011
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/clinbiomech
Citation
Clinical Biomechanics, 2011, v. 26 n. 6, p. 556-561 How to Cite?
AbstractBackground: Iliac screw loosening has been a clinical problem in the lumbo-pelvic reconstruction. Although iliac screws are commonly inserted into either upper or lower iliac column, the biomechanical effects of the two fixations and their revision techniques with bone cement remain undetermined. The purpose of this study was to compare the anchoring strengths of the upper and lower iliac screws with and without cement augmentation. Methods: 5 pairs of formalin fixed cadaveric ilia with the bone mineral density values ranged from 0.82 to 0.97 g/cm 2 were adopted in this study. Using screws with 70-mm length and 7.5-mm diameter, 2 conventional iliac screw fixations and their revision techniques with cement augmentation were sequentially established and tested on the same ilium as follows: upper screw, upper cement screw, lower screw, and lower cement screw. Following 2000 cyclic compressive loading of - 300 N to -100 N to the screw on a material testing machine, the maximum pull-out strengths were measured and analyzed. Findings: The average pull-out strengths of upper, upper cement, lower, and lower cement screws were 964 N, 1462 N, 1537 N, and 1964 N, respectively. The lower screw showed significantly higher pull-out strength than the upper one (P = 0.008). The cement augmentation notably increased the pull-out strengths of both upper and lower screws. The positive correlation between pull-out strength and bone mineral density value was obtained for the 4 fixations. Interpretation: The lower iliac screw technique should be the preferred choice in lumbo-pelvic stabilization surgery; cement augmentation may serve as a useful salvage technique for iliac screw loosening; preoperative evaluation of bone quality is crucial for predicting fixation strength of iliac screw. © 2011 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/170176
ISSN
2015 Impact Factor: 1.636
2015 SCImago Journal Rankings: 0.982
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorYu, BSen_US
dc.contributor.authorLi, ZMen_US
dc.contributor.authorZhou, ZYen_US
dc.contributor.authorZeng, LWen_US
dc.contributor.authorWang, LBen_US
dc.contributor.authorZheng, ZMen_US
dc.contributor.authorLu, WWen_US
dc.date.accessioned2012-10-30T06:05:51Z-
dc.date.available2012-10-30T06:05:51Z-
dc.date.issued2011en_US
dc.identifier.citationClinical Biomechanics, 2011, v. 26 n. 6, p. 556-561en_US
dc.identifier.issn0268-0033en_US
dc.identifier.urihttp://hdl.handle.net/10722/170176-
dc.description.abstractBackground: Iliac screw loosening has been a clinical problem in the lumbo-pelvic reconstruction. Although iliac screws are commonly inserted into either upper or lower iliac column, the biomechanical effects of the two fixations and their revision techniques with bone cement remain undetermined. The purpose of this study was to compare the anchoring strengths of the upper and lower iliac screws with and without cement augmentation. Methods: 5 pairs of formalin fixed cadaveric ilia with the bone mineral density values ranged from 0.82 to 0.97 g/cm 2 were adopted in this study. Using screws with 70-mm length and 7.5-mm diameter, 2 conventional iliac screw fixations and their revision techniques with cement augmentation were sequentially established and tested on the same ilium as follows: upper screw, upper cement screw, lower screw, and lower cement screw. Following 2000 cyclic compressive loading of - 300 N to -100 N to the screw on a material testing machine, the maximum pull-out strengths were measured and analyzed. Findings: The average pull-out strengths of upper, upper cement, lower, and lower cement screws were 964 N, 1462 N, 1537 N, and 1964 N, respectively. The lower screw showed significantly higher pull-out strength than the upper one (P = 0.008). The cement augmentation notably increased the pull-out strengths of both upper and lower screws. The positive correlation between pull-out strength and bone mineral density value was obtained for the 4 fixations. Interpretation: The lower iliac screw technique should be the preferred choice in lumbo-pelvic stabilization surgery; cement augmentation may serve as a useful salvage technique for iliac screw loosening; preoperative evaluation of bone quality is crucial for predicting fixation strength of iliac screw. © 2011 Elsevier Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/clinbiomechen_US
dc.relation.ispartofClinical Biomechanicsen_US
dc.subject.meshAgeden_US
dc.subject.meshBiomechanicsen_US
dc.subject.meshBone Cements - Chemistryen_US
dc.subject.meshBone Densityen_US
dc.subject.meshBone Screwsen_US
dc.subject.meshFemaleen_US
dc.subject.meshHumansen_US
dc.subject.meshIlium - Chemistryen_US
dc.subject.meshMaleen_US
dc.subject.meshMiddle Ageden_US
dc.subject.meshPelvic Bones - Pathologyen_US
dc.subject.meshPelvis - Pathologyen_US
dc.subject.meshStress, Mechanicalen_US
dc.titleBiomechanical effects of insertion location and bone cement augmentation on the anchoring strength of iliac screwen_US
dc.typeArticleen_US
dc.identifier.emailLu, WW:wwlu@hku.hken_US
dc.identifier.authorityLu, WW=rp00411en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.clinbiomech.2011.01.008en_US
dc.identifier.pmid21345556-
dc.identifier.scopuseid_2-s2.0-79959358193en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79959358193&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume26en_US
dc.identifier.issue6en_US
dc.identifier.spage556en_US
dc.identifier.epage561en_US
dc.identifier.isiWOS:000292945400004-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridYu, BS=25633299000en_US
dc.identifier.scopusauthoridLi, ZM=36168413000en_US
dc.identifier.scopusauthoridZhou, ZY=36906256700en_US
dc.identifier.scopusauthoridZeng, LW=42561936200en_US
dc.identifier.scopusauthoridWang, LB=42562124400en_US
dc.identifier.scopusauthoridZheng, ZM=7403007434en_US
dc.identifier.scopusauthoridLu, WW=7404215221en_US
dc.identifier.citeulike8947286-

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