Related Experiment Video
Updated: Jun 30, 2025
06:42
Extracting the Cochlea from a Human Temporal Bone: A Cadaveric Protocol
Published on: August 18, 2023
729
Orientation of the Cochlea From a Surgeon's Perspective
Nozomu Matsumoto1, Nana Akagi-Tsuchihashi1, Teppei Noda1
1Department of Otorhinolaryngology, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
Otology & Neurotology Open
|March 22, 2024
Summary
Misalignment during cochlear implantation can cause electrode tip fold-over. Analyzing the cochlea's "slope angle" may help surgeons prevent this complication by ensuring proper electrode array insertion.
Area of Science:
- Otolaryngology
- Neurosurgery
- Biomedical Engineering
Background:
- Electrode tip fold-over during cochlear implantation is a known complication.
- This fold-over is often caused by misalignment between the electrode array's coiling and the cochlea's natural curvature.
Purpose of the Study:
- To investigate the cochlea's orientation relative to the surgical view.
- To identify a quantifiable measure that could predict or prevent electrode tip fold-over.
Main Methods:
- Surgical videos and CT scans from 220 cochlear implantation procedures (2010-2021) were analyzed.
- The "slope angle" was measured, defined as the angle between the cochlea's coiling plane and the horizontal plane.
Main Results:
- The mean slope angle across all cases was 12.1° ± 9.5°.
- Individual surgeons demonstrated preferred, consistent ranges for the slope angle during procedures.
- The slope angle varied from -9.4° to 44.6° across the patient cohort.
Conclusions:
- Understanding the cochlea's slope angle is crucial for successful cochlear implantation.
- Minimizing misalignment by considering the slope angle during electrode insertion may prevent tip fold-over in slim perimodiolar electrode arrays.
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