Comparative study of cochlear damage with three perimodiolar electrode designs

Adrien A. Eshraghi, Nathaniel W. Yang, Thomas J. Balkany

Research output: Contribution to journalArticlepeer-review

179 Scopus citations


Objective: To describe intracochlear insertion trauma caused by three perimodiolar cochlear implant electrodes. Study Design: Descriptive histological study of 15 human cadaver temporal bones. Methods: Fifteen cadaver temporal bones underwent surface preparation and were implanted with one of the following perimodiolar electrode arrays: Combi 40+PM (MedE1 Corporation), HiFocus II (Advanced Bionics Corporation), or Contour (Cochlear Corporation). A cryosectioning technique was used to study horizontal sections at 200-μm intervals with the electrode in place. Image-enhanced videofluoroscopy and computer-assisted morphometrics were used to assess the mechanism of insertion trauma and to determine electrode position within the modiolus. Results: Histological examination revealed varying degrees of damage to the spiral ligament, basilar membrane, and osseous spiral lamina. Using a novel grading system for electrode trauma, there was no statistically significant difference among the three electrodes. A literature search of histological studies of a commonly used "standard" electrode showed damage equal to or greater than that seen in the current study. Conclusions: Insertion trauma caused by periomodiolar electrodes occurs to an acceptable degree. Refinement of electrodes based on mechanisms of trauma may be able to further reduce damage.

Original languageEnglish (US)
Pages (from-to)415-419
Number of pages5
Issue number3
StatePublished - Mar 1 2003


  • Cochlear implant
  • Cochlear trauma
  • Cryomicrotomy
  • Deafness
  • Inner ear
  • Perimodiolar electrode
  • Temporal bone

ASJC Scopus subject areas

  • Otorhinolaryngology


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