caa a22 4500 60618726X CHVBK 20210128100840.0 cr unu---uuuuu 210128e20151101xx s 000 0 eng 10.1007/s00405-014-3352-4 doi (NATIONALLICENCE)springer-10.1007/s00405-014-3352-4 Estimation of insertion depth angle based on cochlea diameter and linear insertion depth: a prediction tool for the CI422 [Elektronische Daten] [Annett Franke-Trieger, Dirk Mürbe] Beside the cochlear size, the linear insertion depth (LID) influences the insertion depth angle of cochlear implant electrode arrays. For the specific implant CI422 the recommended LID is not fixed but can vary continuously between 20 and 25mm. In the current study, the influence of cochlea size and LID on the final insertion depth angle was investigated to develop a prediction tool for the insertion depth angle by means of cochlea diameter and LID. Preoperative estimation of insertion depth angles might help surgeons avoid exceeding an intended insertion depth, especially with respect to low-frequency residual hearing preservation. Postoperative, high-resolution 3D-radiographs provided by Flat Panel Computed Volume Tomography (FPCT) were used to investigate the insertion depth angle in 37 CI422 recipients. Furthermore, the FPCT images were used to measure linear insertion depth and diameter of the basal turn of the cochlea. A considerable variation of measured insertion depth angles ranging from 306° to 579° was identified. The measured linear insertion depth ranged from −18.6 to 26.2mm and correlated positively with the insertion depth angle. The cochlea diameter ranged from 8.11 to 10.42mm and correlated negatively with the insertion depth angle. The results suggest that preoperatively measured cochlea diameter combined with the option of different array positions by means of LID may act as predictors for the final insertion depth angle. Springer-Verlag Berlin Heidelberg, 2014 Cochlea implant array nationallicence Insertion depth angle nationallicence Linear insertion depth nationallicence Cochlear size nationallicence Franke-Trieger Annett Department of Otorhinolaryngology, Saxonian Cochlear Implant Center, Technische Universität of Dresden, Fetscherstr. 74, 01307, Dresden, Germany aut Mürbe Dirk Department of Otorhinolaryngology, Saxonian Cochlear Implant Center, Technische Universität of Dresden, Fetscherstr. 74, 01307, Dresden, Germany aut European Archives of Oto-Rhino-Laryngology Springer Berlin Heidelberg 272/11(2015-11-01), 3193-3199 0937-4477 272:11<3193 2015 272 405 https://doi.org/10.1007/s00405-014-3352-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00405-014-3352-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Franke-Trieger Annett Department of Otorhinolaryngology, Saxonian Cochlear Implant Center, Technische Universität of Dresden, Fetscherstr. 74, 01307, Dresden, Germany aut NATIONALLICENCE 700 1- Mürbe Dirk Department of Otorhinolaryngology, Saxonian Cochlear Implant Center, Technische Universität of Dresden, Fetscherstr. 74, 01307, Dresden, Germany aut NATIONALLICENCE 773 0- European Archives of Oto-Rhino-Laryngology Springer Berlin Heidelberg 272/11(2015-11-01), 3193-3199 0937-4477 272:11<3193 2015 272 405