Wang J, et al. - This study was designed to evaluate differences in intra- and postoperative electrode impedances following cochlear implantation between round window insertions (RWI) and extended round window insertions (ERWI). In investigations, no significant difference was observed between RWI and ERWI in operative duration or complications of cochlear implantation. In addition, no significant differences were reported in postoperative electrode impedance values between the two surgical routes.