Implantation of the CLARION (R) Cochlear Implant in an ossified cochlea

This report describes the successful implantation of the CLARION(R) Multi-S trategy(TM) Cochlear Implant electrode in the totally ossified cochlea of a 5-year-old child via a radical mastoidectomy approach. Postoperatively, th e child demonstrated responses to auditory stimuli, even though the electro de array contacted only bone and muscle graft tissue with no visible eviden ce of nerve fibers or cochlear lumen. Responses to sound did not begin to e merge until 10 weeks following initial stimulation and improved slowly over time. Although the child's postoperative auditory performance is more limi ted than that of most implanted children, she derives substantially more be nefit from her implant than she did from conventional hearing aids.