title: Ultrasound vs pointer palpation based method in THA navigation: a comparative study.
abstract: Intraoperative registration of the anterior pelvic plane is necessary for navigation during total hip arthroplasty (THA). Ultrasound referencing of bony landmarks was implemented in a THA navigation system (OrthoPilot, B. Braun Aesculap; Tuttlingen, Germany) as an alternative to pointer palpation. This study compared the accuracy of manual pointer palpation with ultrasound registration for determining anterior pelvic plane registration in a consecutive series of 37 cases. Findings showed postoperative radiographic anteversion was lower than ultrasound and pointer navigated anteversion. Because ultrasound registers the bony landmarks of the anterior pelvic plane with a high degree of accuracy, we conclude radiographs 2 weeks post-operatively are not suited to evaluate anteversion, because they still display a pelvic tilt due to a pre-operative flexion contraction.
authors.affiliation: Department of Orthopaedic and Trauma Surgery, Lukas Krankenhaus, Biinde, Germany.
authors.forename: Hartmuth
authors.initials: H
authors.lastname: Kiefer
authors.forename: Aneis
authors.initials: A
authors.lastname: Othman
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000503:physiopathology / Q000601:surgery*; D010173:Palpation / Q000379:methods*; D016059:Range of Motion, Articular; D025321:Surgery, Computer-Assisted / Q000379:methods*; D016896:Treatment Outcome; D014463:Ultrasonography / Q000295:instrumentation*