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AuthorSchempf, Michaeldc.contributor.author
Date of accession2016-03-14T15:22:15Zdc.date.accessioned
Available in OPARU since2016-03-14T15:22:15Zdc.date.available
Year of creation2008dc.date.created
AbstractThe aim of this study is to evaluate the accuracy of Iso-C-arm based drill holes in the proximal femur. In nine artificial proximal femura, two holes with an angle of 135 degrees and 100 degrees in relation to the shaft axis were drilled in the direction of the femoral head. The defined target of the 3.2 mm drillings was a 4 mm steel ball, which had previously been placed and fixed at the cranial center of the femoral head. All the drillings were standardized with a navigated drilling machine fixed to a frame which only allowed movement of the system in the direction of the drill. During navigation the positions of the drill before commencement and at the deepest point of the canal were recorded. After drilling all specimens were evaluated by CT, and the coordinates of the center of the start and the end of the drilled hole and the center of the ball were determined. Using vector calculation, the smallest distance between the straight line, defined by the center of the starting point and the end point of the drill hole, and the center of the ball was calculated. Additionally, the coordinates of the intersection between the perpendicular to the center of the ball and the straight line were determined (xv, yv, zv), to evaluate the direction of misplacement of the drilled canal in relation to the target. For the 135 degrees drill holes, a median of 2.5 mm for the smallest distance between the straight line, given by the center of the start and the end of the hole, and the center of the ball was investigated (range 1.6-3.7 mm). For the 100 degrees holes the median was 3.1 mm (range 1.8-4.2 mm). The main plane of deviation in all of the 135 degrees holes was posteriorly, whereas in the 100 degrees holes posterior deviation occurred in four cases, cranial in three cases, and in one case each caudal and anterior deviation occurred. In our opinion, the accuracy of fluoroscopy based navigation applied in the region of the proximal femur is sufficient and reproducible.dc.description.abstract
Languagededc.language.iso
PublisherUniversität Ulmdc.publisher
LicenseStandard (Fassung vom 03.05.2003)dc.rights
Link to license texthttps://oparu.uni-ulm.de/xmlui/license_v1dc.rights.uri
KeywordDrilldc.subject
KeywordIso-C-Armdc.subject
KeywordProximal femurdc.subject
Dewey Decimal GroupDDC 610 / Medicine & healthdc.subject.ddc
TitlePräzisionsanalysen von C-Arm navigierten Bohrungen am proximalen Femurdc.title
Resource typeDissertationdc.type
DOIhttp://dx.doi.org/10.18725/OPARU-1408dc.identifier.doi
URNhttp://nbn-resolving.de/urn:nbn:de:bsz:289-vts-63954dc.identifier.urn
GNDGenauigkeitdc.subject.gnd
GNDNavigationdc.subject.gnd
FacultyMedizinische Fakultätuulm.affiliationGeneral
Date of activation2008-06-06T10:28:47Zuulm.freischaltungVTS
Peer reviewneinuulm.peerReview
Shelfmark print versionZ: J-H 11.990; W: W-H 11.472uulm.shelfmark
DCMI TypeTextuulm.typeDCMI
VTS-ID6395uulm.vtsID
CategoryPublikationenuulm.category


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