title: Navigated non-image-based positioning of the acetabulum during total hip replacement.
abstract: We tested the hypothesis that the non-image-based navigation system used in our department was able to measure accurately the 3D positioning of the acetabular cup of a total hip replacement (THR) and to increase the accuracy of its implantation during THR. We studied 50 consecutive navigated implantations of a THR and compared the intra-operative measurement of the cup by the navigation system to the post-operative measurement by computed tomography (CT) scan. The mean difference between the navigated and CT scan measurements for cup inclination was 2 degrees . The mean difference between the navigated and CT-scan measurements for cup flexion was 4 degrees . These differences were significant but considered to be clinically irrelevant in most cases. A total of 73% of the cases were within the safe zone defined prior to the study. The non-image-based system used allows a precise orientation of the cup during THR.
authors.affiliation: Centre de Chirurgie Orthopédique et de la Main, Hôpitaux Universitaires de Strasbourg, 10 Avenue Baumann, 67400, Illkirch-Graffenstaden, France. jean-yves.jenny@chru-strasbourg.fr
authors.forename: Jean-Yves
authors.initials: JY
authors.lastname: Jenny
authors.forename: Cyril
authors.initials: C
authors.lastname: Boeri
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Dosch
authors.forename: Marius
authors.initials: M
authors.lastname: Uscatu
authors.forename: Eugen
authors.initials: E
authors.lastname: Ciobanu
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000601:surgery*; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000502:physiology / Q000601:surgery; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D017755:Prosthesis Fitting; D016059:Range of Motion, Articular / Q000502:physiology; D012189:Retrospective Studies; D025321:Surgery, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed