Back to Search
Start Over
Effectiveness of skull X-RAY to determine cochlear implant insertion depth
- Source :
- Journal of Otolaryngology - Head and Neck Surgery, Vol 47, Iss 1, Pp 1-7 (2018)
- Publication Year :
- 2018
- Publisher :
- SAGE Publications, 2018.
-
Abstract
- Abstract Background Cochlear implant (CI) insertion depth can affect residual hearing preservation, tonotopic range coverage, and Mapping. Therefore, determining insertion depth has the potential to maximize CI performance. A post-op skull X-RAY is commonly used to assess insertion depth, however its effectiveness has not been well established. Our primary objective was to assess the accuracy of post-op skull X-RAYs to determine insertion depth, compared to CT as the gold standard. Secondary objectives were to compare experience level of raters and different skull X-RAY views. Methods Thirteen patients with Advanced Bionic HiRes 90 K implants, and post-operative temporal bone CT scans were selected from the CI database at Sunnybrook Health Sciences Centre. Medical students, otology fellows, and CI surgeons evaluated insertion depths on post-op skull X-RAYs, while neuroradiologists evaluated CT scans. Descriptive statistics, regression analysis, and paired t-tests were used to compare the two types of imaging. Results X-RAYs and CTs provided an equivalent mean insertion depth of 337 degrees (p = 0.93), a mean difference of − 0.9 degrees and a standard deviation of paired differences of 43 degrees. Although means were similar across rater groups, CI surgeons (45 degrees) had the lowest standard deviation of paired differences. Comparing X-RAY views, Caldwell (29 degrees) had less variation than Towne (59 degrees) for standard deviation of paired differences. Conclusions Skull X-RAYs provide accurate and reliable measurements for CI insertion depth. The Caldwell view alone may be sufficient for evaluations of insertion depth, and experience has a minor impact on the variability of estimates.
- Subjects :
- Cochlear implant
Insertion depth
CT
X-RAY
Surgery
RD1-811
Subjects
Details
- Language :
- English
- ISSN :
- 19160216
- Volume :
- 47
- Issue :
- 1
- Database :
- Directory of Open Access Journals
- Journal :
- Journal of Otolaryngology - Head and Neck Surgery
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.f4feb642b544977ac542c27e7911c94
- Document Type :
- article
- Full Text :
- https://doi.org/10.1186/s40463-018-0304-9