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Updated: May 31, 2026

Robotic Cochlear Implantation for Direct Cochlear Access
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Robotic Cochlear Implantation for Direct Cochlear Access

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Cochlear function following implantation with a full electrode array.

R J Obholzer1, W P R Gibson

  • 1Sydney Cochlear Implant Centre, Gladesville Sydney, NSW, Australia.

Cochlear Implants International
|July 16, 2011
PubMed
Summary
This summary is machine-generated.

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Conventional cochlear implant array insertion preserves residual hearing in many patients, particularly at low frequencies. This challenges the assumption that full array implantation inevitably leads to hearing loss.

Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Audiology

Background:

  • Clinicians traditionally advise that full cochlear implant (CI) array insertion causes complete hearing loss in the implanted ear.
  • This belief influences patient counseling and surgical approach.

Purpose of the Study:

  • To evaluate the impact of standard full electrode array insertion on cochlear function.
  • To determine the extent of residual hearing preservation after CI surgery.

Main Methods:

  • Air conduction pure tone audiometry was conducted on 81 adult CI patients 6 months post-implantation.
  • Patients received the nucleus CI24 device with complete insertion of a straight (n=68) or contour (n=13) array.
  • Surgery involved a separate cochleostomy anterior to the round window; surgeons were blinded to study inclusion.

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Main Results:

  • 58 out of 81 patients (71.6%) preserved some residual hearing at 6 months post-implantation.
  • Hearing preservation was more pronounced at lower frequencies (e.g., 500 Hz).
  • No correlation was found between insertion depth and hearing preservation.

Conclusions:

  • Standard insertion of a full conventional cochlear implant electrode array is less damaging to cochlear function than commonly assumed.
  • Approximately two-thirds of patients can expect to retain residual low-frequency hearing 6 months post-surgery.
  • This finding supports counseling patients that significant air conduction hearing preservation is possible despite CI implantation.