[Experimental studies and theoretical considerations on the behavior of stapes metal prostheses in the magnetic field of a nuclear magnetic resonance tomograph].

The effects of Nuclear Magnetic Resonance Imaging fields on stapedectomy prostheses were studied in several experiments and calculated theoretically. Sufficiently strong forces to create a risk of dislodgement were found to be exerted on ferromagnetic alloys. However, with the paramagnetic steelwire prosthesis (Schuknecht) or the platinumpiston types no hazards are to be feared. Studies with operated patients proved the expected hearing loss inside the magnetic field at distinct positions of the head, as vibrations of the steelwire are attenuated.