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The objective of this prospective study was to evaluate the position of the slim, perimodiolar electrode (SPE), and to study the influence of the SPE position on CI outcome.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>Methods<\/jats:title>\n<jats:p>Twenty-three consecutively implanted, adult SPE candidates were included in this prospective cohort study conducted between December 2016 and April 2019. Mean age at surgery was 59.5\u00a0years. Mean preoperative residual hearing was 92.2\u00a0dB. Intra-operative fluoroscopy and high-resolution computed tomography scans were performed to evaluate electrode position after insertion using a cochleostomy (CS) approach. Follow-up was 12 months after implantation; residual hearing (6\u20138\u00a0weeks) and speech perception (6\u20138\u00a0weeks and 12\u00a0months) were evaluated in relation to the intracochlear SPE position.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>Results<\/jats:title>\n<jats:p>In most patients in whom the SPE was positioned in the <jats:bold>s<\/jats:bold>cala tympani residual hearing was preserved [mean absolute increase in PTA of 4.4\u00a0dB and 77.2% relative hearing preservation (RHP%)]. Translocation into the scala vestibuli occurred in 36% of the insertions, resulting in a mean absolute increase in PTA of 17.9\u00a0dB, and a RHP% of 19.2%. Participants with a translocation had poorer speech perception scores at 12-month follow-up.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>Conclusion<\/jats:title>\n<jats:p>Given the incidence of CS-associated translocations with the SPE and the negative effect on outcome, it is advised to insert the SPE using the (extended) round window approach.<\/jats:p>\n<\/jats:sec>","DOI":"10.1007\/s00405-019-05696-y","type":"journal-article","created":{"date-parts":[[2019,10,25]],"date-time":"2019-10-25T20:06:46Z","timestamp":1572034006000},"page":"343-350","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["The evaluation of a slim perimodiolar electrode: surgical technique in relation to intracochlear position and cochlear implant outcomes"],"prefix":"10.1007","volume":"277","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2042-2254","authenticated-orcid":false,"given":"Floris","family":"Heutink","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Berit M.","family":"Verbist","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lucas H. 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