Document Detail

MR safety and compatibility of a noninvasively expandable total-joint endoprosthesis.
MedLine Citation:
PMID:  16214609     Owner:  NLM     Status:  MEDLINE    
A noninvasively expandable total-joint endoprosthesis is now available for pediatric patients; the prosthesis can be lengthened by external application of a magnetic field. We investigated the risks of unintentional heating or lengthening of the prosthesis during MR imaging and evaluated the effect of the device on the diagnostic efficacy of MR imaging of surrounding tissues. We performed MR imaging at 1.5 T by using standard pulse sequences and pulse sequences with high-gradient and high-radiofrequency duty cycle. MR imaging caused no measurable change in prosthesis length, and the temperature of the prosthesis increased by less than 1 degrees C during repeated 14-min exposures. Despite significant signal loss and image distortion around the prosthetic joint, clinically useful images were obtained as close as 12 cm from the ends of the prosthetic stems, measured toward the body of the device. Thus, the prosthesis can be safely exposed to MR imaging pulse sequences at 1.5 T, and the visualization of some tissue surrounding the device is clinically useful.
Robert J Ogg; C Brian McDaniel; Donald Wallace; Pierre Pitot; Michael D Neel; Sue C Kaste
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Publication Detail:
Type:  Journal Article     Date:  2005-09-08
Journal Detail:
Title:  Magnetic resonance imaging     Volume:  23     ISSN:  0730-725X     ISO Abbreviation:  Magn Reson Imaging     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-10-10     Completed Date:  2006-05-04     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8214883     Medline TA:  Magn Reson Imaging     Country:  United States    
Other Details:
Languages:  eng     Pagination:  789-94     Citation Subset:  IM    
Department of Radiological Sciences, St. Jude Children's Research Hospital, Memphis, TN 38105-2794, USA.
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MeSH Terms
Bone Neoplasms / surgery*
Equipment Safety
Hot Temperature
Magnetic Resonance Imaging*
Osteosarcoma / surgery*
Prostheses and Implants*
Prosthesis Design

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