Outcomes of Muscle versus Fasciocutaneous Free Flap Reconstruction in Acute Burns: A Systematic Review and Meta-analysis.

[BACKGROUND] Free flap reconstruction in acute burns is high risk but often required for limb salvage and coverage of vital structures. Prior studies have shown a flap loss rate up to 44%. This study aimed to compare the complications associated with muscle and fasciocutaneous free flaps in acute burn reconstruction.

[METHODS] A systematic review and meta-analysis was conducted according to PRISMA guidelines and registered on the PROSPERO database (CDR42023471088). The databases accessed were Embase, PubMed, Web of Science, and Cochrane Library. The primary outcome was free flap failure rate based on flap type. Secondary outcomes included venous congestion, arterial thrombosis, amputation, and need for reintervention.

[RESULTS] Twelve studies with 181 free flaps were included: 87 muscle flaps and 94 fasciocutaneous flaps. Muscle flaps had a higher risk ratio (RR) for total flap loss [RR: 2.32, 95% confidence interval (CI): 1.01-5.32, = 0.04], arterial thrombosis (RR: 3.13, 95% CI: 1.17-8.42, = 0.02), and amputations (RR: 8.89, 95% CI: 1.27-70.13, = 0.03) compared with fasciocutaneous flaps. No significant differences were found in venous thrombosis (RR: 1.33, 95% CI: 0.37-4.78, = 0.65) or need for reinterventions (RR: 1.34, 95% CI: 0.77-2.32, = 0.29).

[CONCLUSIONS] Muscle flaps in burn injuries are associated with higher risks of flap failure, arterial thrombosis, and amputations. Fasciocutaneous free flaps in acute burns seem to be safer with better outcomes, though further research is needed to confirm these findings.