Risk assessment of electromagnetic fields exposure with metallic orthopedic implants: a cadaveric study

Area of Science:

• Biomedical Engineering
• Electromagnetics
• Medical Physics

Background:

• Metallic medical devices interact strongly with electromagnetic fields.
• Limited research exists on electromagnetic wave interactions with implanted passive metallic devices.
• Previous studies primarily used numerical simulations and phantom models.

Purpose of the Study:

• To investigate the in situ effects of electromagnetic waves on various orthopedic implants.
• To assess temperature changes and induced currents in metallic implants under simulated environmental exposures.
• To evaluate potential biological risks associated with electromagnetic field exposure in patients with orthopedic implants.

Main Methods:

• Eight orthopedic devices (plates, knee, hip prostheses) were implanted in six human cadavers.
• Devices were exposed to multifrequency electromagnetic fields (VHF, UHF, GSM, GCS) at 50W/m² and 100W/m².
• Temperature measurements and induced current estimations were performed post-exposure.

Main Results:

• No significant temperature increase (<0.2°C) was detected near any of the tested medical devices.
• Slight induced voltages (up to 1.1V) were recorded, deemed too low to cause biological side effects.
• The study demonstrated minimal thermal or electrical effects on orthopedic implants from common electromagnetic exposures.

Conclusions:

• Orthopedic metallic implants show negligible temperature rise when exposed to common electromagnetic fields.
• Induced currents are minimal and unlikely to pose a biological risk.
• This in situ cadaver study provides crucial data on the safety of electromagnetic field exposure for patients with orthopedic implants.