Otosclerosis, known as inner ear calcification, is one of the common causes of hearing loss. In otosclerosis, the wall where the stirrup is adjacent to the inner ear becomes stiff as a result of structural calcification and movement restriction occurs in the stirrup. As a result, sound waves cannot be transmitted to the inner ear fluids at a sufficient level and hearing loss called conductive type occurs. In this case, the inner ear is intact. Only sounds cannot be transmitted. However, in the later stages of the disease, this calcification can also affect the inner ear wall and nervous type hearing loss may also occur.

 

Source:  http://www.kbb.org.tr