Stability of the cochlear implant array in children

Laryngoscope. 1998 Aug;108(8 Pt 1):1119-23. doi: 10.1097/00005537-199808000-00003.


Objective: To determine cochlear implant electrode stability in the young patient. Electrode migration due to future skull growth was a concern that led to prohibiting implantation in children less than 2 years of age. Recently, the high level of performance achieved by young implantees has led to a re-evaluation of this lower age limit, requiring an assessment of the effects of skull growth over time.

Study design: Prospective radiographic analysis of electrode position of cochlear implants in young children.

Methods: Twenty-seven children implanted with the Nucleus (Cochlear Corp., Denver, CO) or Clarion (Advanced Bionics Inc., Sylmar, CA) multi-channel cochlear prostheses were subjects for this study. Follow-up radiographic studies were obtained for a period of 1 month to 5 years after implantation. The age at time of implantation ranged from 14 months to 5 years. An intraoperative modified Stenver's view plain radiograph was obtained as a baseline. After implantation, on a yearly basis transorbital Stenver's and base views were obtained for comparative purposes. Additional radiographs were obtained whenever a change in performance or electrode map caused suspicion for extrusion. Electrode position was determined using a computer graphics enhancement technique whereby image contrast filters enhanced the visibility of the electrode array and surrounding bony structures.

Results: An analysis of the data revealed no migration of the electrode array over time.

Conclusions: The confirmation of the stability of the electrode array alleviates the concern of the effects of skull growth on cochlear implantation in young children.

MeSH terms

  • Child, Preschool
  • Cochlear Implantation*
  • Electrodes, Implanted
  • Female
  • Foreign-Body Migration / diagnosis
  • Humans
  • Infant
  • Male
  • Prospective Studies
  • Radiography
  • Temporal Bone / diagnostic imaging