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Similar effect of stem geometry on radiological changes with 2 types of cemented straight stem: The Müller stem and the Virtec stem compared in 711 hips

Background and purpose — There are 2 basic principles in cemented stem fixation: shape-closed and force-closed. We investigated 2 shape-closed straight stems, the Müller (MSS) and the Virtec (VSS), which differ only in geometrical cross section, to determine whether the difference in stem shape woul...

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Autores principales: Clauss, Martin, Bolliger, Lilianna, Brandenberger, Daniel, Ochsner, Peter E, Ilchmann, Thomas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Taylor & Francis 2016
Materias:
Hip
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4812072/
https://www.ncbi.nlm.nih.gov/pubmed/26471977
http://dx.doi.org/10.3109/17453674.2015.1104153
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author Clauss, Martin
Bolliger, Lilianna
Brandenberger, Daniel
Ochsner, Peter E
Ilchmann, Thomas
author_facet Clauss, Martin
Bolliger, Lilianna
Brandenberger, Daniel
Ochsner, Peter E
Ilchmann, Thomas
author_sort Clauss, Martin
collection PubMed
description Background and purpose — There are 2 basic principles in cemented stem fixation: shape-closed and force-closed. We investigated 2 shape-closed straight stems, the Müller (MSS) and the Virtec (VSS), which differ only in geometrical cross section, to determine whether the difference in stem shape would affect the radiological results or long-term survival. Patients and methods — We included 711 hips (in 646 patients) that were operated on between July 1996 and July 2003. Patients randomly received either an MSS (n = 356) or a VSS (n = 355) and were followed prospectively. Radiographs taken at a follow-up of > 10 years were analyzed for osteolysis. Kaplan-Meier (KM) survival analysis was performed using various endpoints. We also performed Cox regression analysis to identify risk factors for aseptic loosening and osteolysis of the stem. Results — After 10 years, KM survival with “revision of any component for any reason” was 92% (95% CI: 88–95) for the MSS and 95% (CI: 92–97) for the VSS (p = 0.1). With “revision for aseptic loosening of the stem” as the endpoint, KM survival was 96% (CI: 9–98) for the MSS and 98% (CI: 97–100) for the VSS (p = 0.2). Cox regression showed that none of the risk factors analyzed were independent regarding aseptic loosening of the stem or regarding osteolysis. Interpretation — The MSS and the VSS showed excellent survival for aseptic loosening after 10 years. For the 2 different stem designs, we did not find any independent risk factors for aseptic loosening or development of osteolysis.
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spelling pubmed-48120722016-04-19 Similar effect of stem geometry on radiological changes with 2 types of cemented straight stem: The Müller stem and the Virtec stem compared in 711 hips Clauss, Martin Bolliger, Lilianna Brandenberger, Daniel Ochsner, Peter E Ilchmann, Thomas Acta Orthop Hip Background and purpose — There are 2 basic principles in cemented stem fixation: shape-closed and force-closed. We investigated 2 shape-closed straight stems, the Müller (MSS) and the Virtec (VSS), which differ only in geometrical cross section, to determine whether the difference in stem shape would affect the radiological results or long-term survival. Patients and methods — We included 711 hips (in 646 patients) that were operated on between July 1996 and July 2003. Patients randomly received either an MSS (n = 356) or a VSS (n = 355) and were followed prospectively. Radiographs taken at a follow-up of > 10 years were analyzed for osteolysis. Kaplan-Meier (KM) survival analysis was performed using various endpoints. We also performed Cox regression analysis to identify risk factors for aseptic loosening and osteolysis of the stem. Results — After 10 years, KM survival with “revision of any component for any reason” was 92% (95% CI: 88–95) for the MSS and 95% (CI: 92–97) for the VSS (p = 0.1). With “revision for aseptic loosening of the stem” as the endpoint, KM survival was 96% (CI: 9–98) for the MSS and 98% (CI: 97–100) for the VSS (p = 0.2). Cox regression showed that none of the risk factors analyzed were independent regarding aseptic loosening of the stem or regarding osteolysis. Interpretation — The MSS and the VSS showed excellent survival for aseptic loosening after 10 years. For the 2 different stem designs, we did not find any independent risk factors for aseptic loosening or development of osteolysis. Taylor & Francis 2016-04 2015-10-15 /pmc/articles/PMC4812072/ /pubmed/26471977 http://dx.doi.org/10.3109/17453674.2015.1104153 Text en © 2015 The Author(s). Published by Taylor & Francis on behalf of the Nordic Orthopedic Federation. https://creativecommons.org/licenses/by-nc/3.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution-Non-Commercial License (https://creativecommons.org/licenses/by-nc/3.0)
spellingShingle Hip
Clauss, Martin
Bolliger, Lilianna
Brandenberger, Daniel
Ochsner, Peter E
Ilchmann, Thomas
Similar effect of stem geometry on radiological changes with 2 types of cemented straight stem: The Müller stem and the Virtec stem compared in 711 hips
title Similar effect of stem geometry on radiological changes with 2 types of cemented straight stem: The Müller stem and the Virtec stem compared in 711 hips
title_full Similar effect of stem geometry on radiological changes with 2 types of cemented straight stem: The Müller stem and the Virtec stem compared in 711 hips
title_fullStr Similar effect of stem geometry on radiological changes with 2 types of cemented straight stem: The Müller stem and the Virtec stem compared in 711 hips
title_full_unstemmed Similar effect of stem geometry on radiological changes with 2 types of cemented straight stem: The Müller stem and the Virtec stem compared in 711 hips
title_short Similar effect of stem geometry on radiological changes with 2 types of cemented straight stem: The Müller stem and the Virtec stem compared in 711 hips
title_sort similar effect of stem geometry on radiological changes with 2 types of cemented straight stem: the müller stem and the virtec stem compared in 711 hips
topic Hip
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4812072/
https://www.ncbi.nlm.nih.gov/pubmed/26471977
http://dx.doi.org/10.3109/17453674.2015.1104153
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