Difference in cochlear length between male and female patients

Area of Science:

• Otolaryngology
• Radiology
• Anatomy

Background:

• Cochlear duct length (CDL) is a critical parameter in auditory research and clinical applications.
• Previous studies have not definitively established sex-based differences in CDL.
• Accurate measurement of CDL is essential for understanding auditory development and pathology.

Purpose of the Study:

• To investigate and compare cochlear duct length (CDL) between male and female patients.
• To utilize temporal bone CT scans to evaluate the diameter of the basal turn (distance A) as a proxy for CDL.
• To determine if sex is a significant factor influencing CDL.

Main Methods:

• Retrospective review of 888 temporal bone CT scans from 2014-2020.
• Measurement of basal turn diameter (distance A) on multiplanar reconstructions by two independent physicians (otolaryngologist and neuroradiologist).
• Statistical analysis using ANOVA to compare CDL between sexes and sides, with reliability assessed via intra-class correlation.

Main Results:

• A statistically significant difference in basal turn diameter (distance A) was observed between sexes (p < 0.0001), with males exhibiting a larger measurement (0.29 mm greater).
• Estimated CDL was longer in males (34.5 mm) compared to females (33.3 mm).
• No significant difference in CDL was found between the left and right sides (p = 0.226), and good inter-rater reliability (ICC = 0.79) was achieved.

Conclusions:

• Males possess a statistically significant greater cochlear duct length (CDL) compared to females.
• Basal turn diameter on CT scans is a reliable indicator for assessing sex-based differences in CDL.
• These findings contribute to a better understanding of anatomical variations in the human cochlea.