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Comparing Slim Straight and Slim Perimodiolar Electrode Arrays for Cochlear Implantation: Hearing Results and Risks-A
Chul Ho Jang1,2, Do Yeon Kim1
1Department of Otolaryngology, Gwangju Veterans Hospital, Gwangju 62284, Republic of Korea.
Audiology Research
|February 26, 2026
Summary
Straight cochlear implant (CI) electrode arrays offer better safety and hearing preservation than perimodiolar arrays, with similar speech outcomes. Proper electrode placement is key, regardless of CI design.
Area of Science:
- Otolaryngology
- Biomedical Engineering
- Neurosurgery
Background:
- Cochlear implant (CI) electrode array design impacts intracochlear position, hearing results, and surgical risks.
- Straight (lateral wall) and perimodiolar arrays are primary CI designs, but their comparative efficacy is debated.
Purpose of the Study:
- To systematically review and compare hearing outcomes and surgical risks of straight versus perimodiolar CI electrode arrays.
Main Methods:
- Systematic literature search (PubMed, Embase, Scopus, Cochrane Library) for studies from 2015-2025.
- Included comparative clinical studies on speech perception, hearing preservation, or complications.
- Followed PRISMA 2020 guidelines for study selection.
Main Results:
- 32 studies included; speech perception outcomes were comparable between array types.
- Straight arrays showed lower rates of scalar translocation/tip fold-over and better hearing preservation.
- Perimodiolar arrays had potential electrophysiological benefits but higher intracochlear trauma risk with malposition.
Conclusions:
- Straight electrode arrays present a more favorable safety profile with equivalent hearing outcomes compared to perimodiolar arrays.
- Electrode position within the scala tympani is a more significant factor than array design alone.
