title: Imageless navigation for insertion of the acetabular component in total hip arthroplasty: is it as accurate as CT-based navigation?
abstract: In a prospective randomised clinical study acetabular components were implanted either freehand (n = 30) or using CT-based (n = 30) or imageless navigation (n = 30). The position of the component was determined post-operatively on CT scans of the pelvis. Following conventional freehand placement of the acetabular component, only 14 of the 30 were within the safe zone as defined by Lewinnek et al (40 degrees inclination sd 10 degrees ; 15 degrees anteversion sd 10 degrees ). After computer-assisted navigation 25 of 30 acetabular components (CT-based) and 28 of 30 components (imageless) were positioned within this limit (overall p < 0.001). No significant differences were observed between CT-based and imageless navigation (p = 0.23); both showed a significant reduction in variation of the position of the acetabular component compared with conventional freehand arthroplasty (p < 0.001). The duration of the operation was increased by eight minutes with imageless and by 17 minutes with CT-based navigation. Imageless navigation proved as reliable as that using CT in positioning the acetabular component.
authors.affiliation: Department of Orthopaedic Surgery, University of Regensburg, Asklepios Klinikum Bad Abbach, Kaiser-Karl V.-Allee 3, 93077 Bad Abbach, Germany. thomas.kalteis@klinik.uni-regensburg.de
authors.forename: T
authors.initials: T
authors.lastname: Kalteis
authors.forename: M
authors.initials: M
authors.lastname: Handel
authors.forename: H
authors.initials: H
authors.lastname: Bäthis
authors.forename: L
authors.initials: L
authors.lastname: Perlick
authors.forename: M
authors.initials: M
authors.lastname: Tingart
authors.forename: J
authors.initials: J
authors.lastname: Grifka
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D006621:Hip Joint / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000601:surgery*; D011183:Postoperative Complications; D011446:Prospective Studies; D025321:Surgery, Computer-Assisted / Q000379:methods*; D013997:Time Factors; D014057:Tomography, X-Ray Computed / Q000379:methods; D016896:Treatment Outcome