Facial nerve paralysis is one of the complications with temporal bone fractures. Although
most are treated medically with observation and steroids, we review the indications
and surgical approaches to the facial nerve along its course within the temporal bone.
It is important to get an examination as early as possible to determine immediate
vs delayed, and complete vs incomplete paralysis. Patients with immediate onset, complete
facial nerve paralysis should receive electrodiagnostic testing 3-7 days after onset,
to allow for Wallerian degeneration. If there is >90% electroneuronography degeneration
within 6 days or >95% degeneration within 14 days, surgical exploration is recommended.
Exact surgical timing for decompression is controversial and definitive data is lacking
but some authors have had success even beyond 2 months postinjury and the risks and
benefits should always be discussed with each patient. The approach for surgical decompression
of the facial nerve should be based on the site of injury, if discernible, but most
commonly involves transmastoid, middle fossa craniotomy, or a combination of these
approaches. The perigeniculate region is the most commonly injured portion of the
facial nerve with temporal bone fractures. If a transection is encountered, the nerve
should be repaired by either primary nerve repair if tension free, otherwise a secondary
repair with a cable graft should be performed.
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Published online: August 25, 2017
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© 2017 Published by Elsevier Inc.
