Helmstaedter V, et al. - In this retrospective case-control-study, experts assessed the associations between morphologic, electric and functional parameters. Findings suggested an influence of impedances and stimulation charge on each other. They noted the necessity of increased charge for higher cochlear implant output. In hearing rehabilitation, a significantly worse performance of patients with obliterated and patients with ossified cochleae was noted, despite higher charges. In study group patients without morphologic cochlear changes, reduced audiological outcome was noted which furthermore hints at additional factors besides cochlear tissue neogenesis like postinflammational changes at the neural pathway.