title: Total hip arthroplasty using imageless computer-assisted hip navigation: a prospective randomized study.
abstract: In a prospective randomized study of two groups of 65 patients each, we compared the acetabular component position when using the imageless navigation system compared to the freehand conventional technique for cementless total hip arthroplasty. The position of the component was determined postoperatively on computed tomographic scans of the pelvis. There was no significant difference for postoperative mean inclination (P = 0.29), but a significant difference for mean postoperative acetabular component anteversion (P = 0.007), for mean deviation of the postoperative anteversion from the target position of 15° (P = 0.02) and for the outliers regarding inclination (P = 0.02) and anteversion (P < 0.05) between the computer-assisted and the freehand-placement group. Our results demonstrate the importance of imageless navigation for the accurate positioning of the acetabular component.
authors.affiliation: Department of Orthopaedics, Medical University of Vienna, Vienna General Hospital, Vienna, Austria.
authors.forename: Richard
authors.initials: R
authors.lastname: Lass
authors.affiliation: Department of Orthopaedics, Medical University of Vienna, Vienna General Hospital, Vienna, Austria.
authors.forename: Bernd
authors.initials: B
authors.lastname: Kubista
authors.affiliation: Department of Orthopaedics, Medical University of Vienna, Vienna General Hospital, Vienna, Austria.
authors.forename: Boris
authors.initials: B
authors.lastname: Olischar
authors.affiliation: Center for Medical Statistics, Informatics and Intelligent Systems, Medical, University of Vienna, Vienna, Austria.
authors.forename: Sophie
authors.initials: S
authors.lastname: Frantal
authors.affiliation: Department of Orthopaedics, Medical University of Vienna, Vienna General Hospital, Vienna, Austria.
authors.forename: Reinhard
authors.initials: R
authors.lastname: Windhager
authors.affiliation: Department of Orthopaedics, Medical University of Vienna, Vienna General Hospital, Vienna, Austria.
authors.forename: Alexander
authors.initials: A
authors.lastname: Giurea
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging* / Q000601:surgery; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D060750:Bone Anteversion / Q000000981:diagnostic imaging; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D025321:Surgery, Computer-Assisted; D014057:Tomography, X-Ray Computed
keywords: accuracy assessment; cup placement; leg length discrepancy; navigated total hip arthroplasty; prospective randomized study