What cochlear defect necessitates a cochlear implant?

A cochlear implant is typically necessary for individuals with severe to profound sensorineural hearing loss due to a defect in the cochlea, such as damage to hair cells or the auditory nerve. This condition prevents normal sound transmission and processing, rendering traditional hearing aids ineffective. Candidates for cochlear implants often have limited benefit from hearing aids and experience significant communication challenges in everyday situations. The implant bypasses damaged structures in the cochlea, directly stimulating the auditory nerve to restore a sense of sound.