Safety of orthopedic implants in magnetic resonance imaging

an experimental verification

Ritabh Kumar, Richard Lerski, Stephen Gandy, Benedict Clift, Rami J. Abboud

    Research output: Contribution to journalArticle

    43 Citations (Scopus)

    Abstract

    Magnetic resonance imaging (MRI) is an indispensable tool for musculoskeletal imaging. The presence of metal, however, raises concerns. The potential risks are loosening and migration of the implant, heating of the metal with surrounding tissue, causing thermal damage, and artifactual distortion which compromise the diagnostic value of the procedure. The aim of this study was to test experimentally the nature and extent of the first two of these effects in orthopedic implants. The degree of ferromagnetism was evaluated by deflection studies at the portals of a 0.25 Tesla permanent magnet and 1.0 Tesla clinical MRI scanner. None of the orthopedic implants exhibited any attraction. External fixator clamps, however, showed significant ferromagnetism. The heating of implants by “worst-case” scenario imaging sequences was insignificant. Many contemporary nonferromagnetic orthopedic implants can be imaged safely. It is prudent, however, to perform ex vivo deflection studies on a duplicate implant to confirm MR compatibility. With external fixator devices exhibiting strong ferromagnetism, MRI should be avoided. With expanding indications for MRI, orthopedic implants are unlikely to limit the potential of this powerful tool. © 2006 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res
    Original languageEnglish
    Pages (from-to)1799-1802
    Number of pages4
    JournalJournal of Orthopaedic Research
    Volume24
    Issue number9
    DOIs
    Publication statusPublished - Sep 2006

    Fingerprint

    Orthopedics
    Magnetic Resonance Imaging
    Safety
    External Fixators
    Heating
    Metals
    Magnets
    Hot Temperature
    Equipment and Supplies

    Keywords

    • Magnetic resonance imaging (MRI)
    • MRI
    • Orthopedic implants
    • Safety
    • Ferromagnetism
    • Heating

    Cite this

    Kumar, Ritabh ; Lerski, Richard ; Gandy, Stephen ; Clift, Benedict ; Abboud, Rami J. / Safety of orthopedic implants in magnetic resonance imaging : an experimental verification. In: Journal of Orthopaedic Research. 2006 ; Vol. 24, No. 9. pp. 1799-1802.
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    abstract = "Magnetic resonance imaging (MRI) is an indispensable tool for musculoskeletal imaging. The presence of metal, however, raises concerns. The potential risks are loosening and migration of the implant, heating of the metal with surrounding tissue, causing thermal damage, and artifactual distortion which compromise the diagnostic value of the procedure. The aim of this study was to test experimentally the nature and extent of the first two of these effects in orthopedic implants. The degree of ferromagnetism was evaluated by deflection studies at the portals of a 0.25 Tesla permanent magnet and 1.0 Tesla clinical MRI scanner. None of the orthopedic implants exhibited any attraction. External fixator clamps, however, showed significant ferromagnetism. The heating of implants by “worst-case” scenario imaging sequences was insignificant. Many contemporary nonferromagnetic orthopedic implants can be imaged safely. It is prudent, however, to perform ex vivo deflection studies on a duplicate implant to confirm MR compatibility. With external fixator devices exhibiting strong ferromagnetism, MRI should be avoided. With expanding indications for MRI, orthopedic implants are unlikely to limit the potential of this powerful tool. {\circledC} 2006 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res",
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    Safety of orthopedic implants in magnetic resonance imaging : an experimental verification. / Kumar, Ritabh; Lerski, Richard; Gandy, Stephen; Clift, Benedict; Abboud, Rami J.

    In: Journal of Orthopaedic Research, Vol. 24, No. 9, 09.2006, p. 1799-1802.

    Research output: Contribution to journalArticle

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    AU - Lerski, Richard

    AU - Gandy, Stephen

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