ArticleOtology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology2020
Insertion Depth for Optimized Positioning of Precurved Cochlear Implant Electrodes.
Article in Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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5 citing papers in PubMed, 11 citations in OpenAlex.
- Hearing outcomes following cochlear implantation with anatomic or default frequency mapping in postlingual deafness adults.European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery · 2024Trial
- Curvature analysis of CI electrode arrays: a novel approach to categorize perimodiolar positions without anatomical landmarks.European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery · 2025Article
- Variations in microanatomy of the human modiolus require individualized cochlear implantation.Scientific reports · 2022Article
- Automated objective surgical planning for lateral skull base tumors.International journal of computer assisted radiology and surgery · 2022Article
- Notable Programs in Neurotology Series: The Otology Group at Vanderbilt University Medical Center.Otology & neurotology open · 2021Article
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Authors and funding
4 authors at 2 institutions in 1 country.
Funding
Abstract
hypothesisGeneric guidelines for insertion depth of precurved electrodes are suboptimal for many individuals.
backgroundInsertion depths that are too shallow result in decreased cochlear coverage, and ones that are too deep lift electrodes away from the modiolus and degrade the electro-neural interface. Guidelines for insertion depth are generically applied to all individuals using insertion depth markers on the array that can be referenced against anatomical landmarks.
methodsTo normalize our measurements, we determined the optimal position and insertion vector where a precurved array best fits the cochlea for each patient in an IRB-approved, N = 131 subject CT database. The distances from the most basal electrode on an optimally placed array to anatomical landmarks, including the round window (RW) and facial recess (FR), was measured for all patients.
resultsThe standard deviations of the distance from the most basal electrode to the FR and RW are 0.65 mm and 0.26 mm, respectively. Owing to the high variability in FR distance, using the FR as a landmark to determine insertion depth results in >0.5 mm difference with ideal depth in 44% of cases. Alignment of either of the two most proximal RW markers with the RW would result in over-insertion failures for >80% of cases, whereas the use of the third, most medial marker would result in under-insertion in only 19% of cases.
conclusionsNormalized measurements using the optimized insertion vector show low variance in distance from the basal electrode position to the RW, thereby suggesting it as a better landmark for determining insertion depth than the FR.
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