摘要Aim: The utilization of free-tissue transfer secondary to traumatic lower extremity defects in the pediatric population is scarcely described. Factors include microsurgeon inexperience, inadequate center resources, and fear of historically described poor surgical outcomes. The aim of this study is to investigate more recent articles describing free-flap microsurgical reconstruction for these defects.Methods: A systematic review of the literature was conducted through the online databases PubMed, Embase, and Web of Science, examining for articles with at least 20 subjects utilizing free-tissue transfer for soft-tissue defects of the pediatric (aged 18 and younger) lower extremity following traumatic etiology since 2005. Outcomes included flap failure, return to the operating room, and functional status, where available. Results: Seven studies were deemed appropriate for inclusion, with a total of 243 flaps included. Motor vehicle and motorcycle accidents were greater than 75％ of total etiology. Most defects involved the foot or ankle (65.1％). In total, perforator flaps compromised the majority of flaps (54％), with the most common being the anterolateral thigh, the scapular/parascapular, and deep inferior epigastric flaps. Less common perforators included the groin flap, tensor fascia lata, radial forearm, lateral arm, and thoracodorsal perforator flap. Muscle-based flaps were less common (46％), with the latissimus dorsi and rectus muscle flaps composing the majority. The most commonly used recipient vessel was the anterior tibialis (49.5％) and posterior tibialis vessels (45.3％). Most studies performed reconstruction within 7-10 days of presentation. There was a cumulative 6.5％ flap failure rate.Conclusion: Free tissue transfer for pediatric lower extremity trauma is an important tool that likely leads to powerful outcomes. Recent trends indicate increasing usage of perforator flaps. This study shows that based on existing data, free flap utilization for pediatric patients is an adequate modality for repair, and may warrant greater consideration moving forward.