A Systematic Review and Meta-Analysis of Anterolateral Thigh Flap Outcomes in High-Risk Diabetic Foot Reconstruction

Background: Complex diabetic foot ulcers (DFUs) are a leading cause of morbidity and lower-limb amputation, and their management is profoundly challenging. Microvascular free tissue transfer is a primary limb salvage strategy, with the anterolateral thigh (ALT) free-flap recognized as a workhorse reconstructive solution. However, a quantitative summary of its performance specifically within this high-risk patient population is lacking. Methods: A systematic review and single-arm meta-analysis was conducted in accordance with PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines. Five electronic databases (PubMed/MEDLINE, Embase, Scopus, Cochrane, and Web of Science Core Collection) were searched up to 9 September 2025 to identify studies reporting on outcomes of ALT free-flaps for diabetic foot reconstruction. The risk of bias was assessed using the Methodological Index for Non-Randomized Studies (MINORS) criteria. Primary outcomes were set as the complete and partial flap necrosis rate. Secondary outcomes included functional recovery status and complication rates. All data were synthesized using a random-effects model. Results: Six retrospective cohort studies met the inclusion criteria, including a total of 162 patients. The pooled rate of total flap failure was 5.2% (95% CI: 2.5-10.6%), a finding that was highly consistent across all studies (I² = 0%). The pooled incidence of partial flap necrosis was 13.0% (95% CI: 6.3-25.1%), resulting in an overall weighted flap success rate of 81.8%. Notably, the pooled rate of return to ambulation was 95.2% (95% CI: 88.5-98.1%), which also demonstrated no statistical heterogeneity (I² = 0%). Conclusions: The anterolateral thigh free-flap appears to be a robust and highly reliable strategy for diabetic foot reconstruction, associated with low failure rates, minimal long-term complications, and excellent functional recovery. However, the current evidence is limited to a small number of poor-to-moderate-quality retrospective studies. High-quality, prospective, and comparative multicenter trials are necessary to confirm these findings and establish the ALT flap's effectiveness in high-risk cohorts.