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Updated: Feb 7, 2026
Robotic Cochlear Implantation for Direct Cochlear Access
Published on: June 16, 2022
Outcomes after cochlear implant provision in children with cochlear nerve hypoplasia or aplasia
Désirée Ehrmann-Müller1, Heike Kühn1, Cordula Matthies2
1Department of Otorhinolaryngology, Plastic, Esthetic and Reconstructive Head and Neck Surgery, University of Wuerzburg, Josef-Schneider-Str. 11, 97080 Wuerzburg, Germany.
Insights
Cochlear implants (CI) can improve hearing and sound awareness in children with cochlear nerve aplasia or hypoplasia. These children showed significant audiological improvements after CI use, regardless of aplasia or hypoplasia severity.
Area of Science:
- Otolaryngology
- Audiology
- Pediatric Medicine
Background:
- Cochlear nerve aplasia or hypoplasia affects up to 50% of hearing loss cases.
- Evidence is conflicting on cochlear implant (CI) efficacy for hearing rehabilitation in these children.
- This study addresses the need for data on CI outcomes in children with cochlear nerve abnormalities.
Purpose of the Study:
- To assess audiological abilities in children with cochlear nerve hypoplasia or aplasia before and after CI.
- To compare audiological outcomes between children with aplasia versus hypoplasia.
- To inform decisions regarding CI appropriateness for these pediatric cases.
Main Methods:
- Retrospective study of 7 children with diagnosed cochlear nerve aplasia or hypoplasia who received a CI.
- Evaluation of pre- and postoperative audiological performance.
- Assessment of hearing and speech development post-CI.
Main Results:
- All 7 children demonstrated hearing reactions to sound post-CI, with prompt responses noted.
- Aided thresholds in free field were similar for both hypoplasia (30-60 dB) and aplasia (30-70 dB) groups.
- Long-term CI use led to improved hearing reactions and general development in all participants.
Conclusions:
- CI provision supports improved sound detection and awareness in children with radiologically-defined cochlear nerve hypoplasia or aplasia.
- Children with detectable responses to stimuli benefit significantly from CI intervention.
- Findings suggest CI is a viable option for hearing rehabilitation in this pediatric population.
Introduction:
Cochlear nerve aplasia or hypoplasia is found in up to a half of patients with unilateral or bilateral hearing loss. There is an ongoing discussion regarding the indication of cochlear implants for hearing rehabilitation in cases with radiologically-defined aplasia or hypoplasia of the cochlear nerve in those patients, especially in children. At present there is conflicting evidence whether the audiological outcomes of those children with a CI are comparable to those of children with a CI and a radiologically-normal cochlear nerve. The primary aim of this study was to assess the audiological abilities before and after CI provision in children with cochlear nerve hypoplasia or aplasia. Additionally, we aimed to determine if audiological outcomes differed in children with aplasia from those with hypoplasia. Such data should be helpful in determining if CI provision is appropriate for such children.
Methods:
This retrospective study presents 7 children who were diagnosed with cochlear nerve aplasia or hypoplasia and received a CI. The pre- and postoperative audiological performance and the hearing and speech development of the children were examined.
Results:
4 children were unilateral CI users and 3 were bilateral CI users. Hearing reactions could be detected in all children. Already at first fitting, prompt responses and reactions to songs were observed. The aided thresholds in free field in children with hypoplasia were between 30 and 60 dB. Even in children with aplasia, the results in free field with CI averaged between 30 and 70 dB. Therefore the aided thresholds in children with hypoplasia and in children with aplasia of the CN are similar. It could be demonstrated that hearing reactions improve with the long term use of the implant. Improvement in general development could be observed in all children despite the very heterogeneous conditions and the accompanying handicaps.
Conclusion:
The results of this study support the hypothesis that children with radiologically-defined CN hypoplasia or aplasia and detectable responses to electrical or acoustical stimuli can improve their sound detection thresholds and their awareness of sound when provided with a CI.
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