More than 40 publications have reported the ferromagnetic qualities of 261 different metallic objects (aneurysm and hemostatic clips, 32 carotid artery vascular clamps, five dental devices or materials, 16 heart valve prostheses, 29 intravascular coils, filters, and stents, 14 ocular implants, 12 orthopedic implants, materials, and devices, 15 otologic implants, 56 pellets and bullets, 23 penile implants, nine vascular access ports, 33 and miscellaneous, 17) on the basis of measurements of defieclion forces or attraction during exposure to static magnetic fields at strengths of 0.147-4.7 T. Neither group had a surgical complication.ĬONCLUSION: The titanium stapes prosthesis is a good alternative to a stainless steel prosthesis.Ferromagnetic metallic immaterials, and devices are reas contraindications for magnetic resonance imaging, primarily because of the risks associated with their movement or dislodgment. The mean postoperative air-bone gap was 2.65 dB for the stainless steel group and 2.60 for the titanium group. The mean four-frequency hearing improvement was 27.7 dB for the stainless steel group and 27.8 dB for the titanium group. RESULTS: There was no significant difference between groups in hearing improvement or postoperative air-bone gap. MAIN OUTCOME MEASURES: Audiometric results are analyzed, and surgical complications noted. These patients were matched on the basis of age and preoperative bone-conduction scores with patients who underwent stapedectomy with a Robinson stainless steel piston prosthesis. PATIENTS: In all, 50 patients underwent stapedectomy with a Gyrus titanium piston prosthesis. STUDY DESIGN: Retrospective chart review. The objective of the study was to determine whether a titanium piston stapes prosthesis would be audiometrically and surgically equivalent to a Robinson stainless steel piston for stapedectomy. OBJECTIVE: Although stainless steel stapes prostheses have generally been considered magnetic resonance imaging safe, there is concern that this may change with the development of more powerful imaging systems.
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