الفهرس 
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Abstract
Otosclerosis refers to an osseous dysplasia, confined to the human’s otic capsule. It’s an enzyme mediated bone resorption & redeposition process. Along with progressive hearing loss, tinnitus and vertigo may result as well.
The aim of this study was to assess the functions of the saccule, the utricle and the 3 SCC using cVEMP, oVEMP and vHIT respectively, in cases with cochlear otosclerosis and to correlate the results with the audiological measurement.
20 subjects suffering bilateral otosclerosis were enrolled in this study, divided in 2 groups. One group consisted of 10 adult patients with bilateral conductive otosclerosis. The 2nd group consisted of 10 adult patients with bilateral mixed otosclerosis. All patients underwent cVEMP and oVEMP, using a BC 500Hz tone burst stimulus and vHIT for the three SSCs.
The study results revealed that there was significant relation between the cVEMPs and oVEMPs abnormalities and degree of SNHL. Also, statistically significant correlation was determined between the means of AC and BC.PTA with the cVEMPS results but not with the oVEMPs. No correlation between the audiological measurement and the means of each SCC gain.
The findings of the current study suggest that the saccule is more liable to be affected by otosclerosis in comparison with the utricle and the 3 SCCs.