Free-fibula transfer has been widely used since 1975. Many modifications have been described; one of them, association of the lateral part of the soleus muscle to the fibula, is reported here through a 14-case series. This composite flap is intended for extensive defects of the lower limbs involving bone and soft tissues. The flap is considered by the authors to be reliable, with a constant vascularization. A 20-cm length offibula may be harvested associated either with the lateral part of the soleus muscle or with the whole muscle. Moreover, the soleus muscle represents a vascular security inasmuch as it preserves both medullar and periosteal bone supply. Fourteen cases have been performed by the authors since 1978 and could be reviewed with a minimum 2-year follow-up. Average length of bone defect was 12 cm, and average length offibula harvested was 18.6 cm. Soft-tissue defect was always associated and ranged from 8 x 4 cm to 20 x 30 cm. The fibula was harvested with the lateral part of the soleus muscle in 10 cases and with the whole soleus muscle in 4 cases. One total treatment failure was reported and was related to intimal degenerative lesions on veins used for arteriovenous bypass. In other patients, mean time for bone healing was 11 months. Patients could walk again, on average, 17 months after reconstruction. Sequelae at the donor site were minimal.