1 Two rare cases who suffer stapes - otosclerosis associated with ossified mallei superius ligament were reported.

2 Otosclerosis is a progressive degenerative condition of the temporal bone which can result in hearing loss.

3 Objective To assess the effect of stapes surgery on advanced otosclerosis ( AO ).

4 Objective To compare the effect of small fenestra stapedotomy and total stapedectomy in patients with otosclerosis.

5 Objective:To investigate the effects of the stapes surgery on treatment of the otosclerosis to find out the more suitable surgical style.

6 The experimental data obtained may be used as a reference for the treatment of otosclerosis with laser of appropriate power density.

7 Objective To compare the effect of fenestra stapedotomy and total stapedectomy in patients with otosclerosis.