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Does cup position differ between trabecular metal and titanium cups? A radiographic propensity score matched study of 300 hips

Background and purpose — The use of trabecular metal cups in primary total hip arthroplasty (THA) is increasing, despite the survival of Continuum cups being slightly inferior compared with other uncemented cups in registries. This difference is mainly explained by a higher rate of dislocation revis...

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Autores principales: Laaksonen, Inari, Hjelmberg, Natalie, Gromov, Kirill, Eskelinen, Antti E, Rolfson, Ola, Malchau, Henrik, Troelsen, Anders, Mäkelä, Keijo T, Mohaddes, Maziar
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Taylor & Francis 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8023871/
https://www.ncbi.nlm.nih.gov/pubmed/32619155
http://dx.doi.org/10.1080/17453674.2020.1788290
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author Laaksonen, Inari
Hjelmberg, Natalie
Gromov, Kirill
Eskelinen, Antti E
Rolfson, Ola
Malchau, Henrik
Troelsen, Anders
Mäkelä, Keijo T
Mohaddes, Maziar
author_facet Laaksonen, Inari
Hjelmberg, Natalie
Gromov, Kirill
Eskelinen, Antti E
Rolfson, Ola
Malchau, Henrik
Troelsen, Anders
Mäkelä, Keijo T
Mohaddes, Maziar
author_sort Laaksonen, Inari
collection PubMed
description Background and purpose — The use of trabecular metal cups in primary total hip arthroplasty (THA) is increasing, despite the survival of Continuum cups being slightly inferior compared with other uncemented cups in registries. This difference is mainly explained by a higher rate of dislocation revisions. Cup malpositioning is a risk factor for dislocation and, being made of a highly porous material, Continuum cups might be more difficult to position. We evaluated whether Continuum cups had worse cup positioning compared with other uncemented cups. Patients and methods — Based on power calculation, 150 Continuum cups from 1 center were propensity score matched with 150 other uncemented cups from 4 centers. All patients had an uncemented stem, femoral head size of 32 mm or 36 mm, and BMI between 19 and 35. All operations were done for primary osteoarthrosis through a posterior approach. Patients were matched using age, sex, and BMI. Cup positioning was measured from anteroposterior pelvic radiograph using the Martell Hip Analysis Suite software. Results — There was no clinically relevant difference in mean inclination angle between the study group and the control group (43° [95% CI 41–44] and 43° [CI 42–45], respectively). The study group had a larger mean anteversion angle compared with the control group, 19° (CI 18–20) and 17° (CI 15–18) respectively. Interpretation — Continuum cups had a greater anteversion compared with the other uncemented cups. However, the median anteversion was acceptable in both groups and this difference does not explain the larger dislocation rate in the Continuum cups observed in earlier studies.
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spelling pubmed-80238712021-04-22 Does cup position differ between trabecular metal and titanium cups? A radiographic propensity score matched study of 300 hips Laaksonen, Inari Hjelmberg, Natalie Gromov, Kirill Eskelinen, Antti E Rolfson, Ola Malchau, Henrik Troelsen, Anders Mäkelä, Keijo T Mohaddes, Maziar Acta Orthop Research Article Background and purpose — The use of trabecular metal cups in primary total hip arthroplasty (THA) is increasing, despite the survival of Continuum cups being slightly inferior compared with other uncemented cups in registries. This difference is mainly explained by a higher rate of dislocation revisions. Cup malpositioning is a risk factor for dislocation and, being made of a highly porous material, Continuum cups might be more difficult to position. We evaluated whether Continuum cups had worse cup positioning compared with other uncemented cups. Patients and methods — Based on power calculation, 150 Continuum cups from 1 center were propensity score matched with 150 other uncemented cups from 4 centers. All patients had an uncemented stem, femoral head size of 32 mm or 36 mm, and BMI between 19 and 35. All operations were done for primary osteoarthrosis through a posterior approach. Patients were matched using age, sex, and BMI. Cup positioning was measured from anteroposterior pelvic radiograph using the Martell Hip Analysis Suite software. Results — There was no clinically relevant difference in mean inclination angle between the study group and the control group (43° [95% CI 41–44] and 43° [CI 42–45], respectively). The study group had a larger mean anteversion angle compared with the control group, 19° (CI 18–20) and 17° (CI 15–18) respectively. Interpretation — Continuum cups had a greater anteversion compared with the other uncemented cups. However, the median anteversion was acceptable in both groups and this difference does not explain the larger dislocation rate in the Continuum cups observed in earlier studies. Taylor & Francis 2020-07-03 /pmc/articles/PMC8023871/ /pubmed/32619155 http://dx.doi.org/10.1080/17453674.2020.1788290 Text en © 2020 The Author(s). Published by Taylor & Francis on behalf of the Nordic Orthopedic Federation. http://creativecommons.org/licenses/by/4.0/ 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 cited.
spellingShingle Research Article
Laaksonen, Inari
Hjelmberg, Natalie
Gromov, Kirill
Eskelinen, Antti E
Rolfson, Ola
Malchau, Henrik
Troelsen, Anders
Mäkelä, Keijo T
Mohaddes, Maziar
Does cup position differ between trabecular metal and titanium cups? A radiographic propensity score matched study of 300 hips
title Does cup position differ between trabecular metal and titanium cups? A radiographic propensity score matched study of 300 hips
title_full Does cup position differ between trabecular metal and titanium cups? A radiographic propensity score matched study of 300 hips
title_fullStr Does cup position differ between trabecular metal and titanium cups? A radiographic propensity score matched study of 300 hips
title_full_unstemmed Does cup position differ between trabecular metal and titanium cups? A radiographic propensity score matched study of 300 hips
title_short Does cup position differ between trabecular metal and titanium cups? A radiographic propensity score matched study of 300 hips
title_sort does cup position differ between trabecular metal and titanium cups? a radiographic propensity score matched study of 300 hips
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8023871/
https://www.ncbi.nlm.nih.gov/pubmed/32619155
http://dx.doi.org/10.1080/17453674.2020.1788290
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