@ainsleigh Ainsleigh, otosclerosis is a disease of the ear that can cause the bones in the middle ear to get brittle and effectively collapse. I've only heard of it affecting the stapes bone so far. When the stapes collapses, it ends up blocking the tiny passageway from the middle ear to the inner ear so that no sound is getting through to the cochlea. In a stapedectomy the surgeon takes out the old stapes bone remnants and replaces it with a titanium 'bone' that operates like the stapes did.