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Related Concept Videos

The Cochlea01:13

The Cochlea

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Related Experiment Video

Updated: Dec 30, 2025

Performing Intracochlear Electrocochleography During Cochlear Implantation
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How Much Cochlea Do You Need for Cochlear Implantation?

Stefan K Plontke1, Laura Fröhlich1, Luise Wagner1

  • 1Department of Otorhinolaryngology, Head and Neck Surgery.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|January 28, 2020
PubMed
Summary

Cochlear implantation (CI) after removing intracochlear schwannomas showed surprisingly good word recognition scores. These results suggest CI may be effective even with significant cochlear damage from tumor removal.

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Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Audiology

Background:

  • Intracochlear and intravestibulocochlear schwannomas are rare tumors.
  • Surgical removal can cause significant damage to the cochlea.
  • Cochlear implantation (CI) is a treatment for hearing loss, but its efficacy after cochlear trauma is debated.

Purpose of the Study:

  • To evaluate the effectiveness of cochlear implantation (CI) in patients who have undergone surgical resection of intracochlear or intravestibulocochlear schwannomas.
  • To compare the hearing outcomes of these patients with a control group of CI recipients.

Main Methods:

  • A nonconcurrent cohort study was conducted at a single tertiary referral center.
  • Sixteen patients who received CI after tumor resection (2011-2018) were compared to 16 matched control CI patients.
  • Hearing outcomes were assessed using monosyllabic word recognition scores in quiet at 65 dB SPL.

Main Results:

  • Patients with schwannoma removal and CI achieved a mean word recognition score of 75% at 12 months post-implantation.
  • This was significantly better than the control group, which achieved 58% in the tumor group and 41% in the control group.
  • Good word recognition was observed despite substantial structural defects in the cochlear capsule.

Conclusions:

  • Cochlear implantation demonstrates a tendency toward better word recognition outcomes in patients with intracochlear schwannomas, even after extensive cochlear damage.
  • These findings challenge previous assumptions about CI efficacy in traumatically altered cochleae.
  • The results may influence clinical considerations for cochlear implantation in similar or other challenging cases.