Salvage surgery for free flap failure in the maxillofacial region: a comprehensive review of principles and outcomes.

Background: Free tissue transfer is the cornerstone of complex maxillofacial reconstruction, offering high success rates (90-95%) but carrying the risk of devastating flap failure in 1.5-5.8% of cases. When failure occurs, it necessitates urgent, strategic decision-making to mitigate morbidity and preserve oncological and functional outcomes. Objective: This review aims to synthesize current evidence on the principles, decision-making frameworks, and outcomes of salvage surgery following free-flap failure in the maxillofacial region. Methods/findings: A comprehensive narrative review was conducted, integrating data from clinical studies, case series, and systematic reviews published between 2000 and 2024. Key themes included the etiology and timing of flap failure (predominantly venous thrombosis within 48 hours), the critical distinction between flap salvage and salvage surgery, and a multifactorial decision matrix incorporating patient, defect, oncologic, and institutional factors. Reconstructive options range from second free flaps (success rates ~67-73%) and pedicled flaps (e.g., pectoralis major) to prosthetic rehabilitation. Immediate salvage is preferred in stable patients, whereas a staged "bridge and stage" approach using negative pressure wound therapy is safer in compromised settings. Functional outcomes vary by site and technique, but salvage surgery can significantly reduce pain and improve quality of life, with curative potential in select oncologic recurrences. Conclusion: Free-flap failure, while uncommon, demands a systematic, individualized, and multidisciplinary response. With timely intervention and an appropriate reconstructive strategy - whether microvascular, pedicled, or prosthetic - salvage surgery can successfully restore form, function, and hope, transforming a surgical crisis into a manageable clinical challenge.