title: A new method of registration in navigated hip arthroplasty without the need to register the anterior pelvic plane.
abstract: A prospective clinical study of 50 patients was conducted to validate a new method of imageless computer navigated hip arthroplasty. The new method enables the surgeon to acquire all registration points with the patient positioned and draped in lateral decubitus position. The final component orientation was measured from post-operative CT scans. The mean error in component position was -1.1° (SD 3.1°) for inclination and 0.9° (SD 4.3°) for anteversion. This compared favourably with the error of -1.8° (SD 1.8°) for inclination and -4.8° (SD 2.7°) for anteversion when using the traditional APP registration. Results show that one can expect the acetabular component to be within a safe zone of ±10° in 99.8% for inclination and 97.7% for anteversion when using the new lateral registration method. Level of Evidence Level II, Prognostic study.
authors.affiliation: The Royal Orthopaedic Hospital NHS Foundation Trust, Northfield, Birmingham, UK; The Dudley Group NHS Foundation Trust, Dudley, West Midlands, UK.
authors.forename: Edward T
authors.initials: ET
authors.lastname: Davis
authors.affiliation: Brainlab AG, R&D Surgery, Feldkirchen, Germany.
authors.forename: Mario
authors.initials: M
authors.lastname: Schubert
authors.affiliation: Brainlab AG, R&D Surgery, Feldkirchen, Germany.
authors.forename: Melanie
authors.initials: M
authors.lastname: Wegner
authors.affiliation: Brainlab AG, R&D Surgery, Feldkirchen, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Haimerl
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000601:surgery*; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D010384:Pelvic Bones / Q000000981:diagnostic imaging*; D011446:Prospective Studies; D012447:Sacrum / Q000000981:diagnostic imaging*; D025321:Surgery, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed
keywords: acetabular component orientation; component position; computer assisted surgery; computer navigation; total hip arthroplasty