Partial and Double-Array Implantation of the Ossified Cochlea

Abstract

To review our experience with partial standard and double-array cochlear implantation in the ossified cochlea. Retrospective case review. Tertiary referral center. Twenty cochleae in 19 adult and pediatric patients with ossified cochleae. Patients underwent either partial insertion of a standard electrode array or double-array electrode insertion for their cochlear implantation. Number of electrodes inserted, number of active electrodes at follow-up, and open-set speech performance. Twelve patients (four children and eight adults) had partial insertion of standard array electrode. The mean number of electrodes inserted and active at follow-up was 14.8 and 11.3, respectively. Eight patients (four children and four adults) had a double-array electrode implanted. The mean number of electrodes inserted and active at follow-up was 18.1 and 16.3, respectively. Open-set speech recognition was better in children regardless of duration of deafness. There were no complications. These findings suggest that the double array allows for more usable electrodes than in partially inserted cochlear implant. Compared with adults, children with ossified cochlea do well both in partial standard and double-array insertion. Both insertion techniques are safe, with no complications occurring in our patients. Straight and double arrays should be available in the operating suite for any patient in whom suspected cochlear ossification is confronted.