The Otosclerosis reference article from the English Wikipedia on 24-Apr-2004
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Otosclerosis

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Otosclerosis is a hearing condition where the stapes in the ear becomes attached to the surrounding bone by a growth of abnormal bone. Sound transmission is progressively impaired so that hearing in the affected ear deteriorates.

The condition can be cured by having a stapedectomy. This involves bypassing the stuck stapes by making a hole through it to the outer chamber of the inner ear and placing an artificial bone from the still moveable healthy hearing bones through the hole to the inner ear.