RESUMO
BACKGROUND: Arteriovenous loops are one of the main therapeutic alternatives to address the absence of recipient vessels in lower extremity microsurgical reconstruction. However, there is no consensus on whether to perform them in one or two surgical stages. The objective of this work is to determine whether the outcome of lower limb free flaps anastomosed to vascular loops depends on the number of surgical stages. MATERIALS AND METHODS: A literature review was conducted, following PRISMA guidelines, on vascular loops and free flaps in lower limb. Survival rate, as well as major and minor complications were studied. A forest plot and Pearson's chi-square were used for statistical analysis. Study quality was assessed in duplicate using Methodological Index for Non-Randomized Studies (MINORS) and Joanna Briggs Institute (JBI) tool. This study was registered on PROSPERO. RESULTS: Thirty-two articles using free flaps anastomosed to vascular loops in lower limb, either one or two-stage, were selected. A total of 296 flaps were included, 52% (n = 154) in one and 48% (n = 142) in two surgical times. No statistically significant differences were found in the survival rate (OR = 1.85, 95% CI 0.62; 5.47, p = .09 and p = .344) or major complications (OR = 0.70, 95% CI 0.31; 1.57, p = .56 and p = .92) of flaps between both groups. CONCLUSIONS: According to the available evidence, the outcome of free flaps anastomosed to vascular loops in the lower limb does not depend on the number of surgical stages they undergo. Although there is some heterogeneity in the groups studied, the decision on the number of procedures to be performed should be determined by the surgeon, concerning the clinical situation of the patient, as well as to the vascular, bone and soft tissue status of the extremity.