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

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 a...

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Autores principales: Wada, Hiroshi, Mishima, Hajime, Yoshizawa, Tomohiro, Sugaya, Hisashi, Nishino, Tomofumi, Yamazaki, Masashi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Bentham Science Publishers 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4807411/
https://www.ncbi.nlm.nih.gov/pubmed/27073586
http://dx.doi.org/10.2174/1874325001610010026
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author Wada, Hiroshi
Mishima, Hajime
Yoshizawa, Tomohiro
Sugaya, Hisashi
Nishino, Tomofumi
Yamazaki, Masashi
author_facet Wada, Hiroshi
Mishima, Hajime
Yoshizawa, Tomohiro
Sugaya, Hisashi
Nishino, Tomofumi
Yamazaki, Masashi
author_sort Wada, Hiroshi
collection PubMed
description 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.
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spelling pubmed-48074112016-04-12 Initial Results of an Acetabular Center Axis Registration Technique in Navigated Hip Arthroplasty with Deformed Acetabular Rims Wada, Hiroshi Mishima, Hajime Yoshizawa, Tomohiro Sugaya, Hisashi Nishino, Tomofumi Yamazaki, Masashi Open Orthop J Article 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. Bentham Science Publishers 2016-03-22 /pmc/articles/PMC4807411/ /pubmed/27073586 http://dx.doi.org/10.2174/1874325001610010026 Text en © Wada et al.; Licensee Bentham Open. http://creativecommons.org/licenses/by-nc/4.0/ 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.
spellingShingle Article
Wada, Hiroshi
Mishima, Hajime
Yoshizawa, Tomohiro
Sugaya, Hisashi
Nishino, Tomofumi
Yamazaki, Masashi
Initial Results of an Acetabular Center Axis Registration Technique in Navigated Hip Arthroplasty with Deformed Acetabular Rims
title Initial Results of an Acetabular Center Axis Registration Technique in Navigated Hip Arthroplasty with Deformed Acetabular Rims
title_full Initial Results of an Acetabular Center Axis Registration Technique in Navigated Hip Arthroplasty with Deformed Acetabular Rims
title_fullStr Initial Results of an Acetabular Center Axis Registration Technique in Navigated Hip Arthroplasty with Deformed Acetabular Rims
title_full_unstemmed Initial Results of an Acetabular Center Axis Registration Technique in Navigated Hip Arthroplasty with Deformed Acetabular Rims
title_short Initial Results of an Acetabular Center Axis Registration Technique in Navigated Hip Arthroplasty with Deformed Acetabular Rims
title_sort initial results of an acetabular center axis registration technique in navigated hip arthroplasty with deformed acetabular rims
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4807411/
https://www.ncbi.nlm.nih.gov/pubmed/27073586
http://dx.doi.org/10.2174/1874325001610010026
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