From the Research
Intramedullary nails are generally safe for MRI scanning, but a 3.0 T MRI should be avoided when possible, especially if further activation of the nail is required, as suggested by the most recent study 1.
Key Considerations
- The use of magnetic resonance imaging (MRI) with a magnetic intramedullary lengthening nail in place is contraindicated per the manufacturer due to concerns of implant activation and migration, but recent studies have shown that MRI appears to be safe with a magnetic nail in place and did not result in any complications 1.
- A retrospective analysis of patients who underwent an MRI with a magnetic lengthening nail in place found no adverse effects, and no hardware complications were identified 1.
- However, the study also found that a 3.0 T MRI weakened the internal magnet, and therefore, a 3.0 T MRI should be avoided when possible if further activation of the nail is required 1.
Recommendations
- Patients with intramedullary nails can typically undergo MRI examinations immediately after surgical placement without safety concerns, but informed consent should be obtained prior to an MRI being performed 1.
- To minimize artifacts, radiologists may employ specialized metal artifact reduction sequences (MARS), adjust the field strength, or modify imaging parameters.
- Patients should always inform MRI technologists about their intramedullary nail before undergoing scans, and the referring physician should communicate with the radiology department to optimize imaging protocols for diagnostic accuracy.
Additional Considerations
- Other studies have compared the use of titanium and carbon fiber intramedullary nails in terms of MRI compatibility, with carbon fiber nails showing reduced artifact and improved imaging quality 2, 3, 4.
- However, these studies are not directly relevant to the question of MRI compatibility with magnetic intramedullary nails, and the most recent study 1 should be prioritized when making a recommendation.