Full-field measurement of micromotion around a cementless femoral stem using micro-CT imaging and radiopaque markers.

Détails

ID Serval
serval:BIB_D127CDABD54A
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Full-field measurement of micromotion around a cementless femoral stem using micro-CT imaging and radiopaque markers.
Périodique
Journal of biomechanics
Auteur(s)
Malfroy Camine V., Rüdiger H.A., Pioletti D.P., Terrier A.
ISSN
1873-2380 (Electronic)
ISSN-L
0021-9290
Statut éditorial
Publié
Date de publication
08/12/2016
Peer-reviewed
Oui
Volume
49
Numéro
16
Pages
4002-4008
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
A good primary stability of cementless femoral stems is essential for the long-term success of total hip arthroplasty. Experimental measurement of implant micromotion with linear variable differential transformers is commonly used to assess implant primary stability in pre-clinical testing. But these measurements are often limited to a few distinct points at the interface. New techniques based on micro-computed tomography (micro-CT) have recently been introduced, such as Digital Volume Correlation (DVC) or markers-based approaches. DVC is however limited to measurement around non-metallic implants due to metal-induced imaging artifacts, and markers-based techniques are confined to a small portion of the implant. In this paper, we present a technique based on micro-CT imaging and radiopaque markers to provide the first full-field micromotion measurement at the entire bone-implant interface of a cementless femoral stem implanted in a cadaveric femur. Micromotion was measured during compression and torsion. Over 300 simultaneous measurement points were obtained. Micromotion amplitude ranged from 0 to 24µm in compression and from 0 to 49µm in torsion. Peak micromotion was distal in compression and proximal in torsion. The technique bias was 5.1µm and its repeatability standard deviation was 4µm. The method was thus highly reliable and compared well with results obtained with linear variable differential transformers (LVDTs) reported in the literature. These results indicate that this micro-CT based technique is perfectly relevant to observe local variations in primary stability around metallic implants. Possible applications include pre-clinical testing of implants and validation of patient-specific models for pre-operative planning.

Mots-clé
Arthroplasty, Replacement, Hip, Bone-Implant Interface/diagnostic imaging, Bone-Implant Interface/physiology, Femur/diagnostic imaging, Femur/physiology, Humans, Motion, Pressure, Prostheses and Implants, Prosthesis Design, Stress, Mechanical, X-Ray Microtomography, Femoral stem, Micro-CT, Micromotion, Primary stability, Total hip replacement
Pubmed
Web of science
Création de la notice
30/11/2016 20:53
Dernière modification de la notice
20/08/2019 15:51
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