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Robotic Cochlear Implantation for Direct Cochlear Access

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High-resolution computerized tomography for ossicular replacement prostheses.

Pongsathorn Sagonrat¹, Kan Radeesri², Sirinan Junthong¹

¹Department of Otolaryngology, Faculty of Medicine Vajira Hospital, Bangkok, Thailand.

Acta Otorrinolaringologica Espanola

|November 25, 2022

Summary

High-resolution computed tomography (HRCT) accurately measures distances between ossicular structures in cadaveric temporal bones. These HRCT measurements closely correlate with actual surgical dissection findings, proving its reliability.

Keywords:

High-resolution computerized tomography Ossicular replacement prosthesis Ossiculoplasty Temporal bone

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Area of Science:

Otolaryngology
Radiology
Anatomy

Background:

Assessing ossicular structures in the temporal bone is crucial.
High-resolution computed tomography (HRCT) offers a non-invasive method for such assessments.
Understanding the accuracy of HRCT in measuring distances between temporal bone elements is of significant interest.

Purpose of the Study:

To measure distances between the malleal neck and the stapedial head and footplate using HRCT.
To compare HRCT measurements with actual distances obtained through surgical dissection of cadaveric temporal bones.

Main Methods:

Utilized 20 cadaveric temporal bones (10 male, 10 female).
Performed HRCT to measure distances between specific ossicular structures.
Conducted surgical dissection to obtain direct measurements for comparison.
Analyzed data using statistical methods, including intraclass correlation coefficients.

Main Results:

HRCT measurements for malleal neck to stapedial head (3.35 mm) and footplate (5.29 mm) were highly comparable to surgical measurements (3.40 mm and 5.30 mm, respectively).
Intraclass correlation coefficients were high (0.901 for head, 0.923 for footplate), indicating strong agreement.
No statistically significant differences were found between HRCT and actual measurements.

Conclusions:

HRCT provides statistically comparable, reliable, and accurate measurements of ossicular structures in cadaveric temporal bones.
HRCT is a valuable tool for assessing the spatial relationships of ossicles, with results mirroring direct surgical measurements.