Functional lower lip reconstruction with the partial latissimus dorsi muscle free flap without nerve coaptation.

Abstract

The repair of extensive lower lip defects is difficult due to the presence of both functional and esthetic requirements. This report describes functional lip repair using the partial latissimus dorsi free flap without nerve coaptation. Reconstruction of the lower lip due to subtotal and total tissue defects was performed using latissimus dorsi free flap on twelve patients, between 2013 and 2017. The etiology was squamous cell carcinoma in six patients, malignant melanoma in one, firearm injury in three and microstomia in two. Following exposure of the lip defect, the partial latissumus dorsi muscle flap was harvested and transfered into the lower lip defect. The microvascular anastomoses was done and no nerve coaptation was performed. The muscle was covered with a skin graft taken from the thigh for mucosal and skin lining. Functional outcomes were assessed using physical examination, electromyography (EMG), electroneuromyography, cold/warm and pain sensation, two point discrimination (TPD), and Semmes Weinstein (SMW) tests. Postoperative course was uneventful for all of the flaps. Patients were followed for between fifteen months and four years (mean 28.2 months).Color match between the flap and the face and functional outcome was satisfactory. Reinnervation was detected at EMG in eleven patients undergoing surgery six months postoperatively.After 1 year, the patients demonstrated quite normal results of the test with SMW and TDP results. None of patients perceived both hot and cold sensation. The technique is an alternative option in lower lip reconstruction since it provides satisfactory functional and esthetic results despite absence of any neural coaptation.