Cochlear implantation is a safe and effective clinical method to restore hearing and communication in deaf patients. As is the case in any other clinical methods there are some problems, failures and complications. In this paper the series of patients that required surgical revision due to various reasons are evaluated. Surgical, anatomical and functional results are evaluated. From 1994 the authors have implanted 95 deaf patients. There were 6 (6,3 %) reoperations in this series of patients. The indication for reoperation were: device failure in 2 cases (Medel C40+), flap breakdown in 2 cases, head injury in 1 case, iatrogenic damage to electrodes in one case. Surgical and anatomical results of all except one revisions were excellent. Functional results in all 6 patients confirmed that they all reached at least the same results as with the first implant if not better soon after the revision surgery. The average time to reach original results was 6.3 months after revision. Cochlear re-implantation is a safe and effective surgical procedure that gives very good functional, anatomical and surgical results.

        Key words: cochlear implantation, revision surgery, device failure, functional results.