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Robotic Cochlear Implantation for Direct Cochlear Access
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Difficult round window access during cochlear implantation: a simple prediction method utilising pre-operative CT

Jun Wei Sia1, Dhana S Kumar1, Heng Wai Yuen2

  • 1Yong Loo Lin School of Medicine, National University of Singaporehttps://ror.org/00mrhvv69, Singapore.

The Journal of Laryngology and Otology
|December 5, 2025
PubMed
Summary

A new method using computed tomography (CT) scans can predict difficult round window access during cochlear implant surgery. This simple technique accurately identifies cases needing extra care, improving surgical planning.

Keywords:
X-ray computedcochlear implantationearround windowtomography

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Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Medical Imaging

Background:

  • Cochlear implantation is a common procedure for hearing loss.
  • Visualizing the round window can be challenging during surgery.
  • Pre-operative imaging is crucial for surgical planning.

Purpose of the Study:

  • To present a novel method for predicting difficult round window accessibility.
  • To evaluate the accuracy of this CT-based prediction method.

Main Methods:

  • Retrospective multicentre study of cochlear implantation surgeries (2018-2021).
  • Analysis of pre-operative CT temporal bone scans using a specific two-line measurement on axial cuts.
  • Comparison of CT predictions with intra-operative findings.

Main Results:

  • Difficult round window access occurred in 10.1% of cases (9/89).
  • The novel CT method correctly predicted 88.9% of these difficult cases.
  • The method demonstrated high sensitivity (89%) and specificity (100%) with statistical significance (p < 0.001).

Conclusions:

  • A simple and effective method for predicting difficult round window access using axial CT images is described.
  • No reconstructed images or complex calculations are required.
  • This technique can aid surgeons in planning cochlear implant procedures.