Cochlear Size and Shape Variation from the Russian Population and a New Cochlear Parameter for a Safe Cochlear...

Area of Science:

• Otolaryngology
• Anatomy
• Medical Imaging

Background:

• Cochlear dimensions are crucial for cochlear implantation.
• Understanding population-specific variations aids surgical precision.

Purpose of the Study:

• To investigate cochlear size and shape variations in the Russian population.
• To introduce and validate a new parameter (I-value) for assessing the straight segment of the cochlear basal turn.
• To correlate cochlear shape with electrode insertion safety.

Main Methods:

• Utilized a medical-grade DICOM viewer (OTOPLAN) for measurements.
• Measured cochlear parameters including A-value (length) and B-value (width) of the basal turn.
• Calculated the B/A ratio for shape determination and introduced the I-value for the effective straight segment.

Main Results:

• Cochlear size (A-value) in Russians: 8.04-10.03 mm (mean 9.03 mm).
• Cochlear basal turn shape: 48% round, 52% elliptical.
• New parameter (I-value) ranged from 6.7-9.6 mm (mean 8.3 mm), approximately 0.7-0.8 mm shorter than A-value.

Conclusions:

• Presents the first data on cochlear size (A-value) for the Russian population.
• Identifies a near-equal prevalence of round and elliptical cochlear basal turns.
• The I-value offers a novel metric for evaluating cochlear anatomy relevant to electrode insertion.