Final answer:
A cochlear implant surgery is the procedure that would require a postauricular incision, which is made behind the ear. This surgery helps restore hearing by implanting a device that converts sound to electrical impulses for the auditory nerve, which wouldn't be effective for those with an abnormal auditory nerve.
Step-by-step explanation:
A postauricular incision is a surgical procedure that requires an incision made behind the ear, known as the postauricular area. This type of incision is commonly used for surgeries that involve the structures deep within the ear. Among the listed procedures, a cochlear implant surgery would require a postauricular incision. A cochlear implant is a device that can restore hearing in individuals with a nonfunctional cochlea by converting sounds to electrical impulses and sending them to the auditory nerve. A postauricular incision provides access to the inner ear where the device can be implanted.
Regarding the different types of hearing loss, a cochlear implant would not be able to restore hearing in cases of an abnormal auditory nerve, because the device relies on a functioning auditory nerve to transmit the electric impulses.