The most common forms of severe hearing loss and deafness are related to morphological
changes in the cochlea. Many individuals with such forms of hearing disorders have
received cochlear implants. It has been assumed that preservation of spiral ganglion cells is
important for success of cochlear implants. Preservation of ganglion cells is negatively correlated
with the duration of the hearing loss. It has, however, not been possible to reveal a relationship
between the degree of survival of spiral ganglion cells and performance of cochlear
implants. It is important to understand the histopathological changes that follow cochlear
implantation. Insertion of cochlear implants may cause trauma to the basilar membrane, the
spiral lamina, and the spiral ligament. Rupture of the basilar membrane may occur. Over time,
new bone forms at the cochleostomy and along the implant track. Further investigation is necessary
to evaluate the causes of variability of behavioral measures of performance.
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