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This review covers the issues related to the application of radial free forearm flaps for the reconstruction of defects after surgeries for oral squamous cell carcinoma. The advantages of this method include optimal match of the flap to the tissues of the oral cavity, good adaptation to defect edges, and possibility to replace defects of almost any size and locations. Flap survival rate reaches 92.0–98.4 %. The method demonstrated good functional and aesthetic results when used for the repair of extensive defects of the tongue, oral floor, cheeks, as well as total defects of the lips, hard and soft palates. The main disadvantages of the method include aesthetic defects of the donor site and possible forearm dysfunction, but most patients are quite comfortable with these inconveniences. The death rate is 0.09 %; the incidence of complications is 15–24 %. The main cause of graft failure in this case is venous thrombosis. Advanced age is not currently considered as a contraindication for this method. Further studies evaluating free radial flaps are highly relevant, particularly those comparing this method with other ones and determining strict indications for it (such as size and location of the defect, tumor characteristics, and previous treatment).

The study objective is to assess immediate and long-term results of replacing complex defects with a free radial forearm flap in the multimodal treatment of patients with locally advanced oral cavity squamous cell carcinoma. Materials and methods. Twenty eight patients (20 women and 8 men aged 23 to 71 years) with locally advanced oral cavity squamous cell carcinoma (including 10 buccal cancers, 8 carcinomas of tongue, 6 carcinomas of the floor of the mouth, 2 retromolar area carcinomas, 1 carcinoma of the hard palate and 1 carcinoma of alveolar region of the lower jaw) underwent tumor surgery with simultaneous plastic reconstruction of the defect using radial forearm free flap at the department of head and neck tumors of N. N. Blokhin National Medical Research Center of Oncology within 2010–2018. Primary tumors were detected in 2 patients and 11 patients had residual (n = 7) or recurrent (n = 4) tumors after radiotherapy or chemoradiotherapy. Results. An overall success rate was 96.4 %. Postoperative histology revealed that there were no tumor cells at the resection edges. Postoperative complications included: complete flap necrosis in 1 patient with severe concomitant diseases, marginal flap necrosis in 2 patients (in both cases after the necrotic tissue had rejected, wounds were healed by secondary intention), sural veins thrombosis in 1 patient, acute peptic ulcer bleeding on the 6th day after surgery in 1 patient treated with emergency endoscopic hemostasis. No lethal outcomes were reported. Postoperative period lasted in average 14 days. Upon subsequent observation tumor relapse in the oral cavity occurred in 4 (14.3 %) patients, relapses of regional metastases – in 2 (7.1 %). Good aesthetic and functional results were noted. Adequate restoration of breathing, chewing, swallowing and speaking resulted in a full patients’ rehabilitation. In all cases, the radial flap adapted well to the oral cavity organs and corresponded to the surrounding tissues in thickness and consistency. Conclusion. Use of a radial forearm free flap makes it possible to successfully reconstruct extensive and complex defects after surgery of locally advanced primary and recurrent forms of oral cavity squamous cell cancer of various locations. Due to flap’s high regenerative capabilities, preoperative radiation therapy does not affect the frequency of local complications. It allows restoring vital functions of the oral cavity and achieving good aesthetic and functional results.