Morphometry around Cochleostomy Site to Aid Safe Cochlear Implantation

Area of Science:

• Otolaryngology
• Neurosurgery
• Medical Imaging

Background:

• Safe cochleostomy and electrode insertion are critical for cochlear implant surgery.
• Precise anatomical landmarks are needed to prevent complications during inner ear surgery.

Purpose of the Study:

• To define and measure key anatomical parameters at the cochleostomy site.
• To establish reference values for the round window to carotid canal distance (RCD), basal turn diameter (BD), and promontory thickness (PT).
• To assess the utility of these measurements for guiding safe cochlear implant placement.

Main Methods:

• A cross-sectional observational study was conducted on 150 individuals.
• CT temporal bone images were analyzed to measure RCD, BD, and PT.
• Paired T-test was used to compare measurements between genders and sides.

Main Results:

• Mean RCD was 8.84 mm, mean BD was 2.27 mm, and mean PT was 1.15 mm.
• No statistically significant differences were found in RCD, BD, or PT between genders (p=0.37) or sides (p=0.24).

Conclusions:

• The study provides defined anatomical measurements crucial for safe cochleostomy.
• These measurements serve as valuable guides for accurate electrode insertion and preventing misplacement during cochlear implantation.
• Established reference values aid surgeons in planning and executing cochlear implant procedures safely.