Inclusion Criteria:  Patient aged> 18 years  Diagnosis of otosclerosis with indication for primary stapes surgery by the combination of the arguments:  Clinical: normal eardrum and audiometry revealing conductive or mixed hearing loss with audiometric Rinne of> 15 dB and absence of stapedial reflex. Radiological: otosclerotic foci on preoperative CT scan Non-opposition to participating in the study Good understanding of French Affiliate or beneficiary of a health insurance plan  Inclusion criteria for witnesses:  Person aged> 18 years Absence of known otological pathology Without otological surgical history Non-opposition to participating in the study Good understanding of French  Exclusion Criteria:  Comorbidity that may interfere with the interpretation of results History of stapes surgery Person benefiting from a legal protection measure