Related Experiment Video
Updated: Jul 4, 2026
03:58
Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion
Published on: January 17, 2025
Cochlear size variation in a large-scale international multicentre cohort.
Andrea Schreier1, Mario Zernotti2, Aanand Acharya3
1Department of Otorhinolaryngology, Head and Neck Surgery, Ludwig Maximilians University, Munich, Germany; Department of Otorhinolaryngology, Head and Neck Surgery, TU Dresden, Dresden, Germany.
Hearing Research
|July 2, 2026
Summary
Cochlear size and shape vary significantly across global populations, with most exhibiting an elliptical basal turn. This study confirms average cochlear dimensions while revealing greater anatomical variability than previously understood.
Area of Science:
- Anatomy and Physiology
- Medical Imaging
- Otolaryngology
Background:
- Cochlear size and shape are crucial for hearing implant outcomes.
- Previous studies report variations in cochlear dimensions, but data is fragmented.
- Standardized measurement of cochlear parameters is needed for accurate comparisons.
Purpose of the Study:
- To review existing literature on cochlear size (A-value).
- To consolidate cochlear parameters (A-value and B-value) using OTOPLAN®.
- To compare these measurements with published data and assess variations.
Main Methods:
- Conducted a scoping literature review for A-value measurements.
- Collected international cochlear measurements using OTOPLAN® software.
- Calculated the B- to A-value ratio to determine basal turn shape.
Main Results:
- Literature review: 38 studies, 5,206 A-value measurements (avg. 9.08 mm).
- OTOPLAN® data: 5,580 measurements from 43 clinics (mean 9.07 mm).
- 68.7% of cochleae showed an elliptical basal turn shape.
Conclusions:
- Demonstrates significant cochlear size and shape variation across international clinical cohorts.
- Mean A-value aligns with literature, but the range indicates greater anatomical variability.
- The majority of cochleae present an elliptical basal turn configuration.
