External Fixation Devices Within the Magnetic Resonance Imaging Bore: A Safety and Radiologic Analysis.
Journal
Journal of orthopaedic trauma
ISSN: 1531-2291
Titre abrégé: J Orthop Trauma
Pays: United States
ID NLM: 8807705
Informations de publication
Date de publication:
01 01 2021
01 01 2021
Historique:
accepted:
20
05
2020
pubmed:
3
6
2020
medline:
22
6
2021
entrez:
3
6
2020
Statut:
ppublish
Résumé
To (1) report the thermal changes encountered at the pin/skin interface in a cadaver with a knee-spanning external fixator inside the magnetic resonance imaging (MRI) bore and (2) report on the quality of the MRI sequences collected. Three commonly used external fixation systems were placed on cadaveric lower extremities to simulate knee external fixation. Fiber optic thermal probes were placed at the pin/skin interface of a femoral and tibial pin. A control probe was embedded in the soft tissues of the thigh. Full knee MRI scans were performed using a 1.5-Tesla magnet. Real-time thermal data were collected. A clinically significant increase in temperature compared with the control was defined as 2°C. Two blinded radiologists evaluated the images for image quality and overall diagnostic utility using a standardized 5-point grading scale. There were statistically significant differences in the temperature changes between the femoral/tibial pin sites and the control probe sites during each phase of the MRI scan. However, there was only one clinically significant difference in temperature change during a single sequence of one MRI scan of one of the external fixator devices. Overall image quality was graded as a 4 for each image set with 100% interobserver agreement (k = 1.0). Despite significant differences in temperature changes between the pin sites and controls over multiple MRI sequences in commonly used external fixator devices, the differences in temperature change are likely not clinically relevant. Overall image quality and interpretability of the images were excellent.
Identifiants
pubmed: 32482974
pii: 00005131-202101000-00015
doi: 10.1097/BOT.0000000000001848
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e25-e30Informations de copyright
Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.
Déclaration de conflit d'intérêts
The authors report no conflict of interest.
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