Rathgeb, Christoph Martin; Demattè, Marco; Yacoub, Abraam; Anschütz, Lukas Peter; Wagner, Franca; Mantokoudis, Georgios; Caversaccio, Marco; Wimmer, Wilhelm (2019). Clinical Applicability of a Preoperative Angular Insertion Depth Prediction Method for Cochlear Implantation. Otology & neurotology, 40(8), pp. 1011-1017. Lippincott Williams & Wilkins 10.1097/MAO.0000000000002304
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Rathgeb et al. - 2019 - AID.pdf - Published Version Available under License Publisher holds Copyright. Download (314kB) | Preview |
Objective: Evaluation of the accuracy and clinical applica-bility of a single measure cochlear implant angular insertiondepth prediction method.
Background: Cochlear implantation outcomes still varyextensively between patients. One of the possible reasonscould be variability in intracochlear electrode array place-ment. For this reason, single measure methods weresuggested to preoperatively predict angular insertion depths.Based on a previously performed accuracy study in humantemporal bones, we were interested in determining the extentto which the method could be applied in a clinical setting.
Methods: A retrospective analysis was performed on pre-and postoperative radiographic images of 50 cochlearimplant recipients. Preoperatively predicted angular insertiondepths were compared with angular insertion depths mea-sured on postoperative ground truth. The theoretical predic-tion error was computed under the assumption that allachieved insertions were matching the preoperativelyassumed linear insertion depth. More importantly, the clinicalprediction error was assessed using two different softwaretools performed by three experienced surgeons.
Results: Using the proposed method we found a theoreticalprediction error of 5 degrees (SD¼41 degrees). The clinicalprediction error including the cases with extracochlearelectrodes was 70 degrees (SD¼96 degrees).
Conclusions: The presented angular insertion depth predic-tion method is a first practical approach to supportthe preoperative selection of cochlear implant electrodearrays. However, the presented procedure is limited inthat it is unable to predict the occurrence of insertion resultswith extracochlear electrodes and requires user training.Key Words:A value—Basal turn diameter—Cochlear base
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