Otosclerotic Involvement of the Cochlea: A Histologic and Audiologic Study

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Abstract
Correlations were sought between sensorineural hearing loss and otosclerotic endosteal involvement in 29 temporal bones examined histologically. The sensorineural hearing loss of the affected parts of the cochlea was determined by the last antemortum bone conduction audiogram available. There were 8 temporal bones with only stapes footplate involvement, 6 with 1 discrete focus of otosclerotic endosteal involvement, and 15 with 2 or more foci of endosteal involvement. Analysis of audiometric data showed that the group of bones with 2 or more foci of endosteal involvement had a similar incidence of 45 dB sensorineural loss (9 of 15 or 60%) as did the group with no endosteal involvement (5 of 8 or 62%). The group with 2 or more foci had a greater incidence of 60 dB or greater sensorineural loss (46%) compared with the groups with none (12%) or 1 focus (16%) involved. Correlation between hearing loss and involvement of cochlear endosteum was poor. Correlation existed in only 2 of 15 ears with 2 or more foci involving the cochlear endosteum. There was no correlation in the other groups. Apparently cochlear endosteal involvement alone may not be sufficient explanation for the sensorineural hearing loss found with otosclerosis, except in the most severely involved ears.

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