The role of subtotal petrosectomy (STP) in preparing a diseased ear for cochlear implantation has expanded. Because STP involves complete exenteration of all air cells of the temporal bone, obliteration of the mastoid cavity, and closure of the external auditory canal (EAC) and eustachian tube, the resulting sterile field is optimal for cochlear implantation.
1 Subtotal petrosectomy is indicated for extensive infectious middle ear disease, temporal bone or skull base tumors, cerebrospinal fluid leaks, and potential infectious sequelae after temporal bone fractures.
2-5 Subtotal petrosectomy results in maximal conductive hearing loss in addition to any cochlear or sensorineural loss. Additional surgery, such as placement of an osseointegrated implant, can generally overcome the conductive loss if the cochlear reserve is reasonable. For patients with poor underlying sensorineural hearing, an osseointegrated device can provide stimulation to the contralateral ear, or a cochlear implant can be used to stimulate the ear in question.