In facial paralysis, denervation of the orbicularis oculi muscle (OOM) may result in loss of lower eyelid support and paralytic ectropion. Surgical repair of ectropion aims to reduce vertical palpebral aperture and reposition the eyelid and lacrimal punctum to the globe. Common ectropion repair techniques use static support of lower eyelid structures and include canthal tightening, eyelid shortening, and slings, which are not dynamic and are subject to relaxation and recurrence of eyelid laxity and malposition.1 Dynamic function can be restored only through reinnervation of the paralyzed OOM or transfer of functional muscle units, but, to our knowledge, few dynamic procedures have been described.2 In this preclinical study, we describe a novel technique for repair of paralytic medial ectropion using a flap consisting of the transposed contralateral corrugator supercilii muscle (CSM)–tendon unit. The contralateral CSM in unilateral facial paralysis remains innervated and may be transposed as a functional muscle unit.
Genther DJ, Kim LR, Loyo MD, Boahene KD. Transposed Corrugator Supercilii Muscle–Tendon Unit Flap for Contralateral Paralytic Medial Ectropion Repair. JAMA Facial Plast Surg. 2016;18(3):231-232. doi:10.1001/jamafacial.2016.0019