Effect of a collar on subsidence and local micromotion of cementless femoral stems: in vitro comparative study based on micro-computerised tomography.

Détails

ID Serval
serval:BIB_416C8BD9CC71
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Effect of a collar on subsidence and local micromotion of cementless femoral stems: in vitro comparative study based on micro-computerised tomography.
Périodique
International orthopaedics
Auteur(s)
Malfroy Camine V., Rüdiger H.A., Pioletti D.P., Terrier A.
ISSN
1432-5195 (Electronic)
ISSN-L
0341-2695
Statut éditorial
Publié
Date de publication
01/2018
Peer-reviewed
Oui
Volume
42
Numéro
1
Pages
49-57
Langue
anglais
Notes
Publication types: Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
The aim of this study is to quantitatively compare the difference in primary stability between collarless and collared versions of the same femoral stem. Specifically, we tested differences in subsidence and micromotion.
Collarless and collared versions of the same cementless femoral stem were implanted in two groups of six fresh-frozen cadaveric femurs. Each implanted femur was then subsequently tested for axial compressive and torsional loadings. A micro-CT based technique was applied to quantify implant subsidence and compute the map of local micromotion around the femoral stems. Micromotion of collarless and collared stems was compared in each Gruen zone.
Subsidence was higher but not significantly (p = 0.352) with collarless (41.0 ± 29.9 μm) than with collared stems (37.0 ± 44.6 μm). In compression, micromotion was lower (p = 0.257) with collarless (19.5 ± 5 μm) than with collared stems (43.3 ± 33.1 μm). In torsion, micromotion was also lower (p = 0.476) with collarless (96.9 ± 59.8 μm) than collared stems (118.7 ± 45.0 μm). Micromotion was only significantly lower (p = 0.001) in Gruen zone 1 and for compression with collarless (7.0 ± 0.6 μm) than with collared stems (22.6 ± 25.5 μm).
Primary stability was achieved for both stem designs, with a mean micromotion below the osseointegration threshold. Under loading conditions similar to those observed in normal daily activity and with good press-fit, the collar had no influence on subsidence or micromotion. Further studies are required to test the potential advantage of collar with higher loads, undersized stems, or osteoporotic femurs.
Mots-clé
Adult, Aged, Aged, 80 and over, Arthroplasty, Replacement, Hip/instrumentation, Cadaver, Female, Femur/surgery, Hip Prosthesis, Humans, Male, Middle Aged, Osseointegration, Pressure, Prosthesis Design/adverse effects, Prosthesis Design/methods, Prosthesis Failure/adverse effects, X-Ray Microtomography/methods, Cementless Total hip arthroplasty, Collar, Femoral stem, Micromotion, Primary stability, Subsidence
Pubmed
Web of science
Création de la notice
13/06/2017 18:17
Dernière modification de la notice
20/08/2019 13:41
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