Muscle-nerve-muscle Neurotization of the Orbicularis Oris Muscle

Introduction: A denervated half of the orbicularis oris muscle is not reinnervated spontaneously by axon sprouting from the intact contralateral side. The borderline between the facial nerve territories seems to act as a barrier. The muscle-nerve-muscle technique was advocated as a technique to reneurotize a denervated half of the orbicularis oris muscle in cases of marginal mandibular paralysis.

Material And Methods: This muscle-nerve-muscle neurotization was tried to induce reinnervation of a denervated angle of the mouth in four patients. Grafts were harvested from the sural nerve. Functional recovery was assessed by measurement of facial movements and by electrophysiological examination.

Results: In three of the four cases presented, this technique helped to improve function of the lower lip. The clinical relevance of the results is discussed.