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Published on: February 6, 2026
Determining ideal electrode insertion depth in paediatric cochlear implantation
Mohammed Rami1, Youssef Lakhdar, Mohamed Chehbouni2
1Department of Otolaryngology and Head and Neck Surgery, Faculty of Medicine and Pharmacy, Mohammed VI University Hospital, Cadi Ayyad University, Marrakech, Morocco. dr.rami.orl@gmail.com.
Summary
Optimizing cochlear implant surgery for children with hearing loss is key. Deeper electrode insertion (angular depth of insertion) up to 340° showed improved speech perception outcomes in young patients.
Area of Science:
- Otolaryngology
- Neurosurgery
- Speech-Language Pathology
Background:
- Speech and language development after early cochlear implantation (CI) shows significant patient variability.
- Identifying surgical parameters specific to the device is crucial for optimizing CI outcomes.
Purpose of the Study:
- This study examined the relationship between electrode angular depth of insertion (aDOI) and speech perception in children.
- The focus was on a homogeneous group receiving a specific lateral wall electrode design.
Main Methods:
- Twenty-five prelingually deaf children (4-5 years old) received Oticon Neuro ZTI cochlear implants.
- Angular depth of insertion (aDOI) was calculated from radiographs; auditory outcomes were assessed using APCEI and CAP scores.
- Response surface regression modeled the non-linear association between aDOI and auditory performance.
Main Results:
- The mean aDOI was 275°. Speech perception scores varied, with APCEI ranging from 11-21 and CAP from 3-7.
- Non-linear modeling predicted peak auditory performance at approximately 340° aDOI.
- This optimal insertion depth corresponded to predicted APCEI of 17.67 and CAP of 5.98 for the Oticon Neuro ZTI electrode.
Conclusions:
- Auditory outcomes in this cohort showed a non-linear relationship with aDOI, peaking near 340°.
- These findings underscore the importance of device-specific surgical strategies and planning for CI.
- Results are specific to this electrode design and require validation for others.