RESEARCH ARTICLE


Initial Results of an Acetabular Center Axis Registration Technique in Navigated Hip Arthroplasty with Deformed Acetabular Rims



Hiroshi Wada1, Hajime Mishima2, *, Tomohiro Yoshizawa1, Hisashi Sugaya3, Tomofumi Nishino2, Masashi Yamazaki2
1 Department of Orthopaedic Surgery, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
2 Department of Orthopaedic Surgery, Institute of Clinical Medicine, and University Hospital, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
3 Division of Regenerative Medicine for Musculoskeletal System, Department of Orthopaedic Surgery, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan


Article Metrics

CrossRef Citations:
0
Total Statistics:

Full-Text HTML Views: 2090
Abstract HTML Views: 1181
PDF Downloads: 257
ePub Downloads: 231
Total Views/Downloads: 3759
Unique Statistics:

Full-Text HTML Views: 1041
Abstract HTML Views: 701
PDF Downloads: 168
ePub Downloads: 168
Total Views/Downloads: 2078



© Wada et al.; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Department of Orthopaedic Surgery, Institute of Clinical Medicine, and University Hospital, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan; Tel: +81-29853-3219; Fax: +81-29853-3162l; E-mail: hmishima@tsukuba-seikei.jp


Abstract

Background

In cementless total hip arthroplasty, imageless computer-assisted navigation is usually used to register the anterior pelvic plane (APP). The accuracy of this method is influenced by the subcutaneous tissues overlying the registration landmarks. On the other hand, the acetabular center axis (ACA) is determined from the acetabular rim. Precise registration of the ACA is possible because of direct palpation using a pointer. Imageless navigation using the ACA usually targets patients with normal acetabular morphology. The aim of this study was to investigate the accuracy of imageless navigation using the ACA instead of the APP in patients with normal or deformed acetabular rims.

Methods

The intraoperative cup position was compared with that obtained from the postoperative computed tomography (CT) images in 18 cases.

Results

The inclination angle derived from the navigation system was 3.4 ± 5.3 degrees smaller and the anteversion angle was 1.4 ± 3.1 degrees larger than those derived from the CT images.

Conclusion

The inclination cup angle of the navigation system was significantly inferior to the true value, particularly in cases with large anterior osteophytes.

Keywords: Acetabular center axis, cementless total hip arthroplasty, computed tomography, developmental dysplasia of the hip, imageless navigation, osteophyte.