Donor Site Morbidity in Fibula Free Flaps: A Technique-Dependent Comparative Analysis of Donor Site Wound Healing

Abstract

Background: The fibula free flap (FFF) is a mainstay in maxillofacial reconstruction, yet donor site morbidity remains a significant clinical concern. Closure technique is a key factor influencing complication rates, but comparative data remain heterogeneous. This study provides a technique-dependent analysis of 60-day donor site wound healing in FFF with skin paddles and reports a two-stage closure approach. Methods: A retrospective review of 211 patients undergoing FFF between 2017 and 2024 was conducted. Donor site complications within the first 60 postoperative days were assessed and stratified by closure technique: one-stage split-thickness skin grafting (STSG) with or without negative pressure wound therapy (NPWT), and a two-stage closure consisting of one-week NPWT followed by STSG. Multivariate logistic regression was applied to identify independent predictors for complications. Results: Overall, 50.2% of patients experienced donor site complications, with wound healing disorders (31.8%) and (partial) skin necrosis (23.7%) most prevalent. Regarding wound closure, STSG coverage without NPWT was associated with the highest morbidity and a complication rate of 91.0%. Despite being limited in sample size, the two-stage closure, despite larger skin defects, showed complication rates comparable to one-stage closure with NPWT. Multivariate analysis identified STSG with NPWT (OR 0.1 [0.01; 0.4], p = 0.002) and two-stage closure (OR 0.1 [0.01; 0.5], p = 0.01) as protective factors for wound healing complications. Conclusion: Donor site morbidity following FFF harvest with skin paddles is significantly impacted by closure technique. Wound management using one- or two-stage STSG with NPWT is preferred. Initial results of the two-stage closure indicate potentially beneficial outcomes for extensive defects and warrant further prospective validation.