Landmarks for Proper Round Window Electrode Insertion in Cochlear Implantation.

Area of Science:

• Otolaryngology
• Neurosurgery
• Surgical Anatomy

Background:

• Cochlear implantation relies on accurate electrode placement.
• The round window is a common insertion site, but can be challenging.
• Standardized landmarks can improve surgical consistency.

Purpose of the Study:

• To evaluate the utility of five specific surgical landmarks for round window electrode insertion.
• To assess the reliability of these landmarks in cochlear implantation surgery.
• To determine if these landmarks aid in training junior surgeons.

Main Methods:

• A case series of 150 cochlear implantation surgeries was conducted.
• Five landmarks were used to guide round window electrode insertion: oval window, pyramid, fustis, round window membrane, and intracochlear blood vessel arborization.
• Surgeons reported landmark identification and reliability; postoperative imaging confirmed electrode position.

Main Results:

• The oval window and round window membrane were identified in 100% of cases.
• Pyramid (94%), intracochlear wall (90%), and fustis (85%) were also frequently identified.
• All cases demonstrated correct intracochlear electrode placement via postoperative X-ray.

Conclusions:

• The five identified surgical landmarks facilitate precise round window electrode insertion.
• These landmarks are reliable in both straightforward and complex cochlear implantation cases.
• The landmarks serve as a valuable tool for teaching and standardizing the round window insertion technique for surgeons.