Diagnostic and prognostic significance of so-called direct bone conduction in otospongiosis.

The modified Pohlman sound probe was used to provide a prognostic evaluation of the results of surgery in otospongiosis by means of transtympanic exploration. Based on the reactions obtained with this probe, it is possible to recognize theoretically the degree of cochlear involvement 'direct bone conduction coefficient' and to indicate which component of the hearing defect - conductive or perceptive - prevails in a given case of otospongiosis.