Contralateral orbicularis oculi muscle transposition in facial paralysis: functional, aesthetic and electromyographic outcomes. A case report and literature update.

PURPOSE

Many surgical approaches have been described for achieving satisfactory functionality in patients with facial paralysis, to ensure the protection of the cornea and the highest degree of physiological blinking. Out of all those available, dynamic techniques are indicated when motion recovery and synchrony are the goals pursued. transposition (OOT) allows a genuine restoration of blinking by means of contralateral reinnervation, with minimal insult for the donor site.

METHODS

We present the case of a 64-year-old man with unilateral facial paralysis. A physical examination revealed a lagophthalmos of more than 5 mm. A neurophysiological study showed a mild-to-moderate axonal injury of the left facial nerve. Contralateral OOT was indicated as the first therapy option since it can restore involuntary blinking. The orbicularis muscle flap was not divided into branches, as described previously by other authors; the whole flap was transposed to the paralysed upper eyelid to achieve the highest level of potential reinnervation.

RESULTS

Lagophthalmos was fully corrected after the surgery. The patient reported subjective improvement of symptoms, less frequent instillation of artificial tear drops and, especially, synchronous blinking with significant improvement in involuntarity. These improvements were maintained after 1 year of follow-up. Postoperative electromyographic studies confirmed the improvement in neural function.

CONCLUSIONS

OOT can be a safe and effective option for the treatment of patients with peripheral facial paralysis, as it achieves a good restoration of blinking function with minimal morbidity in the healthy donor eye.