Do Dedicated Free Flap Units Improve Outcomes for Free Flap Head and Neck Cancer Patients?

Introduction: Free flap reconstruction is essential for restoring form and function for patients with advanced head and neck cancer. It requires complex postoperative care, prolonged hospitalization, and high costs. Dedicated free flap units (FFUs) as an alternative to ICU level post operative care have been adopted at many tertiary care centers to improve outcomes and decreased associated healthcare costs, yet their advantage remains unclear in the published literature.

Methods: PubMed, Embase, and Cochrane Library were searched (June 12, 2025) for studies of adults undergoing head and neck free flap reconstruction managed in FFUs versus ICU level of care. Risk of bias was assessed using ROBINS-I, RoB 2, or Newcastle–Ottawa Scale as appropriate. The protocol followed PRISMA-P guidelines and was registered on OSF (https://doi.org/10.17605/OSF.IO/KNXYC).

Results: Fifteen studies were included. FFU care was associated with a significant reduction in length of stay (MD = −0.83 SD; 95% CI −1.34 to −0.32; p = 0.0045), corresponding to ~1.8 fewer hospital days. Lower odds of flap failure (OR = 0.29; 95% CI 0.41–1.22; p = 0.21) and pulmonary complications (OR = 0.43; 95% CI 0.16–2.06; p = 0.35) were observed but these measures were imprecise. Cardiovascular complications trended higher in FFUs (OR = 5.38; 95% CI 0.71–40.62; p = 0.09) with wide uncertainty. Though unsuitable for meta-analysis, three studies that evaluated cost reported a savings range of $4,900.86–$29,609 per patient

Conclusions: This is the first meta-analysis to demonstrate a significant reduction in hospital length of stay with dedicated free flap units compared to ICU level of care. Our results can be used to justify the establishment of these units for optimization of the postoperative clinical pathway and cost reduction while maintaining excellent clinical outcomes including flap survival.