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Cochlear orientation: pre-operative evaluation and intra-operative significance.
S Sharma1, M Grover1, S N Singh1
1Department of Otorhinolaryngology and Head Neck Surgery,Sawai Man Singh Medical College and Hospital,Jaipur,Rajasthan,India.
The Journal of Laryngology and Otology
|July 19, 2018
Summary
Pre-operative imaging of cochlear orientation using computed tomography can predict surgical difficulty in cochlear implantation. Calculating angles α and β helps surgeons plan electrode insertion and preserve hearing.
Area of Science:
- Otolaryngology
- Neurosurgery
- Medical Imaging
Background:
- Cochlear implantation is a complex procedure requiring precise surgical navigation.
- Predicting intra-operative challenges in electrode insertion is crucial for successful outcomes.
Purpose of the Study:
- To determine pre-operative cochlear orientation using high-resolution computed tomography (HRCT).
- To correlate calculated angles (α and β) with the ease of electrode insertion during cochlear implantation.
Main Methods:
- HRCT scans were performed on 96 children scheduled for cochlear implantation.
- Two angles, α and β, representing cochlear orientation relative to the surgical axis, were calculated.
- Correlation analysis was performed between these angles and intra-operative insertion difficulty.
Main Results:
- Difficulties in electrode insertion were observed in patients with an α angle < 50 degrees.
- Insertion difficulties also occurred in patients with an α angle > 50 degrees, specifically when the β angle exceeded 20 degrees.
- These findings suggest specific angle thresholds associated with surgical challenges.
Conclusions:
- Pre-operative calculation of cochlear orientation angles (α and β) aids surgical planning.
- This method can help optimize cochleostomy site selection.
- It may also contribute to the preservation of residual hearing by guiding insertion trajectory.
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