title: Accuracy of navigation in hip resurfacing with different surgeons and varying anatomy.
abstract: The accuracy of a commercial imageless navigation system for hip resurfacing and its reproducibility among different surgeons and for varying femoral anatomy was tested by comparing conventional and navigated implantation of the femoral component on different sawbones in a hip simulator. The position of the component was measured on postoperative radiographs. Variance for varus/valgus alignment and anteversion was higher for conventional implantation. Among the three surgeons, operation time, chosen implant size and anteversion were significantly different for conventional implantation but not for the navigated method. Using navigation, no difference was found for normal and abnormal anatomy. Values obtained with the navigation system were consistent with those measured on radiographs. Navigation appeared to be accurate and helped to reduce outliers. This was true for the three different surgeons and in varying anatomical situations.
authors.affiliation: Department of Trauma Surgery, Justus-Liebig-University Giessen, Giessen, Germany. iris.schleicher@ortho.med.uni-giessen.de
authors.forename: Iris
authors.initials: I
authors.lastname: Schleicher
authors.forename: Matthias
authors.initials: M
authors.lastname: Haselbacher
authors.forename: Eckart
authors.initials: E
authors.lastname: Mayr
authors.forename: Peter M
authors.initials: PM
authors.lastname: Kaiser
authors.forename: Florian W
authors.initials: FW
authors.lastname: Lenze
authors.forename: Alexander
authors.initials: A
authors.lastname: Keiler
authors.forename: Michael
authors.initials: M
authors.lastname: Nogler
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000379:methods; D005269:Femur / Q000033:anatomy & histology / Q000473:pathology; D006621:Hip Joint / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D011859:Radiography; D015203:Reproducibility of Results; D013223:Statistics as Topic; D018709:Statistics, Nonparametric; D025321:Surgery, Computer-Assisted / Q000295:instrumentation / Q000379:methods*