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Cochlear implantation in labyrinthitis ossificans
Lavor M.S.D. , Carvalho G.M.D. , Guimarães A.C. , Coelho G.V. , Onuki C. , Bianchini W.A. , Castilho A.M.
UNICAMP, Department of Otorhinolaryngology, Head and Neck, Campinas, Brazil
Labyrinthitis ossificans is a pathologic ossification in the otic capsule due to an inflammatory or destructive
process. The main causes are meningitis, trauma and otosclerosis. Cochlear ossification results in sensorineural
hearing loss and its presence os associated with technical difficulties and poorer functional results. Advances in
surgical techniques and bioengineering provided the development of special electrodes for this condition. The
aim of this study is to evaluate the functional results with partial standard and double-array cochlear implantation
in ossified cochleas and further the performance using the device, the complication rate and patient´s
A retrospective and transversal analysis of data on the demographic aspects, auditory performances, surgical
findings and quality of life was made. A satisfaction questionnaire was implemented and a transorbital
radiograph was used to evaluate migration and depth of insertion of the electrode and the position of the internal
component. All patients who underwent either partial insertion of a standard electrode array or double-array
electrode insertion for their cochlear implantation in a quaternary centre in the last five years were enrolled.
Eight patients (six adults and two children) were included. The cause of labyrinthitis ossificans was bacterial
meningitis in six cases, Cogan´s syndrome in one patient and trauma in one patient. The majority of patients
were implanted in adulthood and the average duration of deafness was 104.5 months. Displacement of basal
electrode was observed in one patient and he went through a new surgical procedure with successfully
repositioning. Bacterial meningitis was the most common cause of cochlear ossification in the sample. In adult
patients, meningitis acquired in childhood resulted in a longer deafness than children patients had , which may
explain poorer auditory results.
Patients with ossified cochleas benefits significantly from double-array and compressed short array cochlear