[Evaluation of cochlear function in otospongiosis. Preliminary study].

One of the major therapeutical problems encountered in the natural history of otospongiosis are lesions affecting Corti's organ. We obtained audiometric measurements, including pure-tone and speech audiograms, tympanograms, and spontaneous and provoked otoemission determinations in 26 patients (40 ears), who benefited from total platinectomy and collumellar effect recuperation by means of temporal aponeurosis interposition and piston-cupping. Results show that the piston-cup procedure does not appear to modify the transfer function of the middle ear. On the other hand, even at a stage when pure-tone and speech audiograms show little alteration, there seems to be some lesion of the external ciliated cells of Corti'organ.