Otoadmittance measurements in cases of dual ossicular disorders

Audiologic evaluations, including otoadmittance measurements, were obtained on two patients, each of whom had dual, series-connected disorders of ossicular fixation and disarticulation. In one case, the disarticulation was the lateral-most disorder; in the other case the fixation was the lateral-most disorder. In both cases, it was the lateral-most disorder that had the dominant effect on the otoadmittance of the tympanic membrane, due to the fact that the sites of the two disorders were connected in series with the tympanic membrane.