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Cochlear Apex Triangulation Utilizing Ct Measures And Middle Ear Landmarks.

Justin Cottrell1, David Landsberger1, Matt Breen2

  • 1Department of Otolaryngology-Head and Neck Surgery, NYU Langone, New York.

Otology & Neurotology Open
|September 27, 2024
PubMed
Summary

This study precisely mapped the cochlear apex using computed tomography (CT) scans. New surgical vectors identified key boundaries, improving accuracy for cochlear implant electrode placement.

Keywords:
Apical cochleostomyCochlear apexCochlear implantCochlear implant accessCochlear implant complicationsLabyrinthitis ossificansPitch perception

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Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Medical Imaging

Background:

  • Accurate placement of cochlear implant electrodes in the cochlear apex is crucial for procedural success.
  • Existing anatomical landmarks for apical electrode insertion can be variable and challenging to identify.
  • Improved characterization of the cochlear apex relative to surgical landmarks is needed.

Purpose of the Study:

  • To anatomically characterize the cochlear apex in relation to surgically relevant landmarks.
  • To provide guidance for surgeons performing apical electrode placement in cochlear implant surgery.
  • To enhance procedural accuracy and potentially reduce trauma during apical cochleostomy.

Main Methods:

  • Retrospective analysis of 82 preoperative computed tomography (CT) scans from cochlear implant recipients.
  • Multiplanar reformats were used to measure cochlear dimensions and distances to middle ear landmarks.
  • A novel stapes vector was developed and assessed for its ability to mark cochlear apex boundaries.

Main Results:

  • Significant variability was observed in the relationship of the cochlear apex to critical surrounding structures.
  • The average lateral width of promontory bone over the cochlear apex was 1.2 mm.
  • A newly developed stapes vector accurately marked the posterior/superior boundary of the apex in 94% of cases, and a parallel vector through the round window marked the anterior/inferior boundary in 89%.

Conclusions:

  • This study provides detailed anatomical characterization of the cochlear apex and its relationship to surgical landmarks.
  • The identified distance relationships and anatomical boundaries can inform surgical approaches for apical cochleostomy.
  • Enhanced understanding of cochlear apex anatomy can improve procedural accuracy and minimize surgical trauma.