Risk of Permanent Dysfunction of Facial Nerves After Open Rigid Internal Fixation in the Treatment of Mandibular Condylar Process Fracture.

Background: Facial nerve palsy is a relatively common complication following open rigid internal fixation (ORIF) of a mandibular condylar fracture. The aim of this study was to investigate the risk factors that influence post-operative facial nerve function and the recovery process.

Methods: A retrospective study was conducted based on the medical records of 329 patients who underwent ORIF treatment for condyle fractures, with the follow-up period being 24 months long.

Results: During the initial post-operative examination, 50.45% of patients exhibited some signs of facial nerve dysfunction, ranging from slight to severe, and 48.63% of patients presented transient palsy, while only 1.82% presented permanent facial nerve palsy. Female patients were found to be more susceptible to post-operative facial nerve palsy. Patients with multiple mandibular fractures and bilateral condyle fractures had a worse prognosis. The preauricular approach and its modifications were identified as posing the greatest risk to the facial nerve. The safest approach was the retromandibular approach. Patients treated for injuries resulting from traffic accidents or falls had a worse prognosis than those treated for assault injuries.

Conclusions: Post-operative facial nerve palsy following ORIF of the mandibular condyle is, in most cases, transient and can be effectively treated. However, it is important to choose the safest possible surgical approach. The safer approach, the retromandibular approach, should be considered when possible.