Cross-Leg Flap: An Effective Alternative for Limb Salvage in Complex Trauma

Although microsurgery is the current gold standard for the reconstruction of lower extremity diffects, the cross-leg flap remains vital when free tissue transfers are not feasible (due to vascular compromise, lack of recipient vessels, or limited resources). The technique has evolved since its description in 1854, with notable advancements including the introduction of the fasciocutaneous flap (Ponten, 1983) and the development of microsurgical variants. Its key indications include severe trauma, absence of local vessels supply, previous flap failures, and resource-limited settings. However, there are relative contraindications such as bilateral trauma or lack of patient cooperation. Among its advantages are its reliability, robustness, independence from local vessels, and technical simplicity. Disadvantages include prolonged immobilization (3-4 weeks), the need for two surgical stages, and potential aesthetic outcomes that may require revisions. Complications vary (necrosis, infection, etc.) but are accompanied by a generally high success rate. Postoperative management is crucial, focusing on immobilization with external fixators, flap monitoring, pain control, and early physiotherapy. The pedicle is divided once the flap has developed sufficient vascularization (approximately 3-4 weeks).