title: Status of navigated total hip arthroplasty in dysplastic osteoarthritis.
abstract: This article describes the results of 41 total hip arthroplasties (THAs) carried out using a new image-free hip navigation system. For the study, registration landmarks (tear drop, posterior rim, and inner wall of the acetabulum) were added to the hip navigation system OrthoPilot (B. Braun Aesculap, Tuttlingen, Germany). The reamer center was indicated in reference to these landmarks, and final cup angle was indicated as the radiologic angle. Forty-one total THAs to treat dysplastic osteoarthritis of the hip were performed. The difference between reamer center and cup center was 4.1 +/- 3.0 mm. The difference in cup abduction angle between navigation and radiography was 6.4 degrees +/- 5.1 degrees and of anteversion was 5.9 degrees +/- 5.0 degrees. Our preliminary clinical results showed adequate accuracy.
authors.affiliation: Department of Orthopaedic Surgery, Saiseikai Nakatsu Hospital, Osaka, Japan.
authors.forename: Hirotsugu
authors.initials: H
authors.lastname: Ohashi
authors.forename: Masanori
authors.initials: M
authors.lastname: Matsuura
authors.forename: Yusaku
authors.initials: Y
authors.lastname: Okamoto
authors.forename: Tsuneyuki
authors.initials: T
authors.lastname: Ebara
authors.forename: Kyosuke
authors.initials: K
authors.lastname: Kakeda
authors.forename: Shinji
authors.initials: S
authors.lastname: Takahashi
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D015992:Body Mass Index; D006801:Humans; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging / Q000601:surgery*; D011859:Radiography; D015203:Reproducibility of Results; D025321:Surgery, Computer-Assisted / Q000379:methods*; D016896:Treatment Outcome