title: Cochlear implant magnet displacement with minor head trauma.
abstract: OBJECTIVE
  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.
  
  
  METHODS
  Retrospective case series.
  
  
  METHODS
  The records of 3 young males who experienced CI magnet dislodgement were reviewed and compared against records from the institutional implant database.
  
  
  RESULTS
  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.
  
  
  CONCLUSIONS
  Magnet displacement may be a relatively common complication after minor head trauma in pediatric patients with certain CIs that have removable magnets.
authors.affiliation: Departments of Otolaryngology and Communicative Disorders, University of Florida, Gainesville, FL 32610-0264, USA.
authors.forename: James M
authors.initials: JM
authors.lastname: Yun
authors.forename: Michelle W
authors.initials: MW
authors.lastname: Colburn
authors.forename: Patrick J
authors.initials: PJ
authors.lastname: Antonelli
mesh_terms: D002675:Child, Preschool; D019929:Cochlear Implantation / Q000009:adverse effects / Q000379:methods*; D003054:Cochlear Implants; D006259:Craniocerebral Trauma / Q000150:complications* / Q000175:diagnosis; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D015601:Injury Severity Score; D008280:Magnetics; D008297:Male; D011475:Prosthesis Failure; D012042:Registries; D012086:Reoperation; D012189:Retrospective Studies; D018570:Risk Assessment; D016896:Treatment Outcome