Inclusion Criteria

• Unilateral or bilateral asymmetric otosclerosis

• Conductive hearing loss of at least 30 dB with an average loss Rinne means greater than or equal to 20 dB

• Normal tympanum

Exclusion Criteria

• Far advanced otosclerosis defined as less than 95dB air conduction at all frequencies or lower bone conduction 55dB on at least one frequency

• Cochlear otosclerosis objectified on the temporal bones Ct-scan

• Others clinical or radiological diagnostics: cholesteatoma, tympanic membrane perforation, geyser's syndrome, ossicular dislocation, ossicular malformation, tympanosclerosis.

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