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Does osteoporosis reduce the primary tilting stability of cementless acetabular cups?

BACKGROUND: Cementless hip cups need sufficient primary tilting stability to achieve osseointegration. The aim of the study was to assess differences of the primary implant stability in osteoporotic bone and in bone with normal bone density. To assess the influence of different cup designs, two type...

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Autores principales: von Schulze Pellengahr, Christoph, von Engelhardt, Lars V, Wegener, Bernd, Müller, Peter E, Fottner, Andreas, Weber, Patrick, Ackermann, Ole, Lahner, Matthias, Teske, Wolfram
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4429325/
https://www.ncbi.nlm.nih.gov/pubmed/25896824
http://dx.doi.org/10.1186/s12891-015-0554-x
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author von Schulze Pellengahr, Christoph
von Engelhardt, Lars V
Wegener, Bernd
Müller, Peter E
Fottner, Andreas
Weber, Patrick
Ackermann, Ole
Lahner, Matthias
Teske, Wolfram
author_facet von Schulze Pellengahr, Christoph
von Engelhardt, Lars V
Wegener, Bernd
Müller, Peter E
Fottner, Andreas
Weber, Patrick
Ackermann, Ole
Lahner, Matthias
Teske, Wolfram
author_sort von Schulze Pellengahr, Christoph
collection PubMed
description BACKGROUND: Cementless hip cups need sufficient primary tilting stability to achieve osseointegration. The aim of the study was to assess differences of the primary implant stability in osteoporotic bone and in bone with normal bone density. To assess the influence of different cup designs, two types of threaded and two types of press-fit cups were tested. METHODS: The maximum tilting moment for two different cementless threaded cups and two different cementless press-fit cups was determined in macerated human hip acetabuli with reduced (n=20) and normal bone density (n=20), determined using Q-CT. The tilting moments for each cup were determined five times in the group with reduced bone density and five times in the group with normal bone density, and the respective average values were calculated. RESULTS: The mean maximum extrusion force of the threaded cup Zintra was 5670.5 N (max. tilting moment 141.8 Nm) in bone with normal density and.5748.3 N (max. tilting moment 143.7 Nm) in osteoporotic bone. For the Hofer Imhof (HI) threaded cup it was 7681.5 N (192.0 Nm) in bone with normal density and 6828.9 N (max. tilting moment 170.7 Nm) in the group with osteoporotic bone. The mean maximum extrusion force of the macro-textured press-fit cup Metallsockel CL was 3824.6 N (max. tilting moment 95.6 Nm) in bone with normal and 2246.2 N (max. tilting moment 56.2 Nm) in osteoporotic bone. For the Monoblock it was 1303.8 N (max. tilting moment 32.6 Nm) in normal and 1317 N (max. tilting moment 32.9 Nm) in osteoporotic bone. There was no significance. A reduction of the maximum tilting moment in osteoporotic bone of the ESKA press-fit cup Metallsockel CL was noticed. CONCLUSION: Results on macerated bone specimens showed no statistically significant reduction of the maximum tilting moment in specimens with osteoporotic bone density compared to normal bone, neither for threaded nor for the press-fit cups. With the limitation that the results were obtained using macerated bone, we could not detect any restrictions for the clinical indication of the examined cementless cups in osteoporotic bone.
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spelling pubmed-44293252015-05-14 Does osteoporosis reduce the primary tilting stability of cementless acetabular cups? von Schulze Pellengahr, Christoph von Engelhardt, Lars V Wegener, Bernd Müller, Peter E Fottner, Andreas Weber, Patrick Ackermann, Ole Lahner, Matthias Teske, Wolfram BMC Musculoskelet Disord Research Article BACKGROUND: Cementless hip cups need sufficient primary tilting stability to achieve osseointegration. The aim of the study was to assess differences of the primary implant stability in osteoporotic bone and in bone with normal bone density. To assess the influence of different cup designs, two types of threaded and two types of press-fit cups were tested. METHODS: The maximum tilting moment for two different cementless threaded cups and two different cementless press-fit cups was determined in macerated human hip acetabuli with reduced (n=20) and normal bone density (n=20), determined using Q-CT. The tilting moments for each cup were determined five times in the group with reduced bone density and five times in the group with normal bone density, and the respective average values were calculated. RESULTS: The mean maximum extrusion force of the threaded cup Zintra was 5670.5 N (max. tilting moment 141.8 Nm) in bone with normal density and.5748.3 N (max. tilting moment 143.7 Nm) in osteoporotic bone. For the Hofer Imhof (HI) threaded cup it was 7681.5 N (192.0 Nm) in bone with normal density and 6828.9 N (max. tilting moment 170.7 Nm) in the group with osteoporotic bone. The mean maximum extrusion force of the macro-textured press-fit cup Metallsockel CL was 3824.6 N (max. tilting moment 95.6 Nm) in bone with normal and 2246.2 N (max. tilting moment 56.2 Nm) in osteoporotic bone. For the Monoblock it was 1303.8 N (max. tilting moment 32.6 Nm) in normal and 1317 N (max. tilting moment 32.9 Nm) in osteoporotic bone. There was no significance. A reduction of the maximum tilting moment in osteoporotic bone of the ESKA press-fit cup Metallsockel CL was noticed. CONCLUSION: Results on macerated bone specimens showed no statistically significant reduction of the maximum tilting moment in specimens with osteoporotic bone density compared to normal bone, neither for threaded nor for the press-fit cups. With the limitation that the results were obtained using macerated bone, we could not detect any restrictions for the clinical indication of the examined cementless cups in osteoporotic bone. BioMed Central 2015-04-21 /pmc/articles/PMC4429325/ /pubmed/25896824 http://dx.doi.org/10.1186/s12891-015-0554-x Text en © von Schulze Pellengahr et al.; licensee BioMed Central. 2015 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research Article
von Schulze Pellengahr, Christoph
von Engelhardt, Lars V
Wegener, Bernd
Müller, Peter E
Fottner, Andreas
Weber, Patrick
Ackermann, Ole
Lahner, Matthias
Teske, Wolfram
Does osteoporosis reduce the primary tilting stability of cementless acetabular cups?
title Does osteoporosis reduce the primary tilting stability of cementless acetabular cups?
title_full Does osteoporosis reduce the primary tilting stability of cementless acetabular cups?
title_fullStr Does osteoporosis reduce the primary tilting stability of cementless acetabular cups?
title_full_unstemmed Does osteoporosis reduce the primary tilting stability of cementless acetabular cups?
title_short Does osteoporosis reduce the primary tilting stability of cementless acetabular cups?
title_sort does osteoporosis reduce the primary tilting stability of cementless acetabular cups?
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4429325/
https://www.ncbi.nlm.nih.gov/pubmed/25896824
http://dx.doi.org/10.1186/s12891-015-0554-x
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