Ultrasound measurements on the os calcis in a prospective multicenter study.

Détails

ID Serval
serval:BIB_B76D105BA88B
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Ultrasound measurements on the os calcis in a prospective multicenter study.
Périodique
Calcified Tissue International
Auteur(s)
Hans D., Schott A.M., Chapuy M.C., Benamar M., Kotzki P.D., Cormier C., Pouilles J.M., Meunier P.J.
ISSN
0171-967X
Statut éditorial
Publié
Date de publication
1994
Peer-reviewed
Oui
Volume
55
Numéro
2
Pages
94-99
Langue
anglais
Résumé
Ultrasonic assessment is a new approach to assess both quality and density. Two ultrasonic parameters are measured on the os calcis: the attenuation or broadband ultrasound attenuation (BUA) and the velocity or speed of sound (SOS). The interunit variations in vitro and in vivo of an ultrasound instrument, the Lunar Achilles system, used in a French multicenter study named EPIDOS, were calculated and the stability of these instruments over a 12-month period was evaluated. A third parameter called "stiffness index," calculated from the SOS and BUA, was also used in this study. The average CV in vitro for the BUA and SOS was 0.92% and 0.12%, respectively, and the average CV in vivo for the BUA, the SOS, and the stiffness index was 1.83%, 0.23%, and 1.9%, respectively. The interunit (or inter-machines) variations were calculated by a one-way analysis of variance. We detected small but significant measurement differences among centers on a phantom for both SOS (maximum significant difference 0.4%) and stiffness (maximum significant difference 3.5%) but not for BUA. Similar differences were found in vivo. The precision over 12 months of the interunit variations in vitro was evaluated by measuring a single phantom traveling from one center to another several times. The range of the CV for the BUA (1.54-0.51%), for the SOS (0.25-0.14%), and for the stiffness index (2.26-1.10%) are explained in part by technical failures. The variation among the five Achilles was estimated by the combined CV which was 1.42% for the BUA, 0.32% for the SOS, and 2.33% for the stiffness index. In conclusion, our findings indicate that equipment from one manufacturer appears to be consistent between machines for the BUA, but not completely for the SOS. The results for this stiffness index are necessarily influenced by both SOS and BUA. The short-term and long-term interunit precision is good, both in vitro and in vivo. Such results provide increased confidence in multicenter clinical trials where ultrasonic data are pooled.
Mots-clé
Adult, Aged, Analysis of Variance, Bone Density, Calcaneus, Female, Humans, Male, Middle Aged, Prospective Studies, Quality Control, Ultrasonography
Pubmed
Web of science
Création de la notice
02/03/2009 13:33
Dernière modification de la notice
20/08/2019 16:25
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