Cochlear implant magnet displacement with minor head trauma.

Abstract

Manufacturers have introduced cochlear implants (CIs) with removable magnets to allow for magnetic resonance imaging after placement. The purpose of this study was to describe magnet displacement as a new CI complication and to suggest a possible treatment option to prevent its recurrence. Retrospective case series. The records of 3 young males who experienced CI magnet dislodgement were reviewed and compared against records from the institutional implant database. Magnet displacement was observed only in young males (14% of male children) who received CI with removable magnets. This occurred 13-14 months after CI placement. Magnets were replaced under general anesthesia, and the scalp was bolstered with a dermal allograft. Recurrent magnet dislodgement was encountered in 1 patient, 6 months later. Magnet displacement may be a relatively common complication after minor head trauma in pediatric patients with certain CIs that have removable magnets.