MRI Safety - Surgeon Information
The results of the MR safety tests for the Smith & Nephew devices indicated the following for the implants:
Titanium Intramedullary Nail - titanium Al/4V
Cobalt Chrome Staple - ASTM F75 cobalt chrome
Compression Hip Screw Plate and Lag Screw - 316L stainless steel
Oxidized Zirconium Knee Femoral Component - Oxinium material
Based on this MR safety test information, it appears that these Smith & Nephew implants will not present additional hazards or risks to patients undergoing an MR procedure using an MR system operating with a static magnetic field of 1.5-Tesla or less. As such, these devices should be considered “MR safe” according to the specific conditions used for testing.
This testing was performed using a shielded, 1.5-tesla 64 MHz MR system made by GE.
Regarding image artifacts, the report states:
For these devices, the artifacts that appeared on the MR images were relatively minor in relation to the size and shape of the metallic components of these devices. Basically the artifacts were shown as localized signal voids (i.e. signal loss) and distortions of the images.
External Fixators: Smith & Nephew’s policy is not to recommend MRI for patients with Ilizarov, Taylor Spatial Frame, or other external frames due to the possibility of magnetic field response causing undesired movement of the frame. Many of the accessory components of external fixators are made using hardenable stainless steels that do exhibit varying levels of magnetic permeability and it is not possible to guarantee use with MRI is safe.
2 Comments:
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