Stapedectomy
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In case of otosclerosis the ossified Stapes may be removed and replaced by a prosthesis - a stapedectomy. Nine out of ten patients who undergo the prodcedure will come out with significantly improved hearing while less than 1% will experience worsened hearing ability or deafness. Successful surgery usually provides an increase in hearing ability of about 20 dB. That is as much difference as having your hands over both ears or not.