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dc.contributor.author
Farshad, Mazda
dc.contributor.author
Farshad-Amacker, Nadja A.
dc.contributor.author
Bachmann, Elias
dc.contributor.author
Snedeker, Jess Gerrit
dc.contributor.author
Schmid, Samuel L.
dc.date.accessioned
2021-05-05T14:14:56Z
dc.date.available
2017-06-11T16:01:31Z
dc.date.available
2021-05-05T14:12:36Z
dc.date.available
2021-05-05T14:14:56Z
dc.date.issued
2014-11
dc.identifier.issn
0001-6268
dc.identifier.issn
0942-0940
dc.identifier.other
10.1007/s00701-014-2244-0
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/97788
dc.identifier.doi
10.3929/ethz-b-000097788
dc.description.abstract
Background While convergent placement of pedicle screws in the axial plane is known to be more advantageous biomechanically, surgeons intuitively aim toward a parallel placement of screws in the sagittal plane. It is however not clear whether parallel placement of screws in the sagittal plane is biomechanically superior to a non-parallel construct. The hypothesis of this study is that sagittal non-parallel pedicle screws do not have an inferior initial pull-out strength compared to parallel placed screws. Methods The established lumbar calf spine model was used for determination of pull-out strength in parallel and non-parallel intersegmental pedicle screw constructs. Each of six lumbar calf spines (L1-L6) was divided into three levels: L1/L2, L3/L4 and L5/L6. Each segment was randomly instrumented with pedicle screws (6/45 mm) with either the standard technique of sagittal parallel or non-parallel screw placement, respectively, under fluoroscopic control. CT was used to verify the intrapedicular positioning of all screws. The maximum pull-out forces and type of failure were registered and compared between the groups. Results The pull-out forces were 5,394 N (range 4,221 N to 8,342 N) for the sagittal non-parallel screws and 5,263 N (range 3,589 N to 7,554 N) for the sagittal-parallel screws (p = 0.838). Interlevel comparisons also showed no statistically significant differences between the groups with no relevant difference in failure mode. Conclusion Non-parallel pedicle screws in the sagittal plane have at least equal initial fixation strength compared to parallel pedicle screws in the setting of the here performed cadaveric calf spine experiments.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Springer
en_US
dc.rights.uri
http://rightsstatements.org/page/InC-NC/1.0/
dc.subject
Biomechanical comparison
en_US
dc.subject
Sagittal non-parallel
en_US
dc.subject
Pedicle screw
en_US
dc.subject
Pull-out force
en_US
dc.title
Biomechanical comparison of sagittal-parallel versus non-parallel pedicle screw placement
en_US
dc.type
Journal Article
dc.rights.license
In Copyright - Non-Commercial Use Permitted
dc.date.published
2014-09-27
ethz.journal.title
Acta Neurochirurgica
ethz.journal.volume
156
en_US
ethz.journal.issue
11
en_US
ethz.journal.abbreviated
Acta Neurochir
ethz.pages.start
2147
en_US
ethz.pages.end
2151
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.notes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.
en_US
ethz.identifier.nebis
002003073
ethz.publication.place
Berlin
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::02518 - Institut für Biomechanik / Institute for Biomechanics::03822 - Snedeker, Jess G. / Snedeker, Jess G.
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::02518 - Institut für Biomechanik / Institute for Biomechanics::03822 - Snedeker, Jess G. / Snedeker, Jess G.
ethz.date.deposited
2017-06-11T16:02:11Z
ethz.source
ECIT
ethz.identifier.importid
imp593652e737e1e77709
ethz.ecitpid
pub:152797
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-13T07:09:43Z
ethz.rosetta.lastUpdated
2020-02-14T14:59:14Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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