Traumatic osteoarticular or ligament defect of the tibial medial malleolus is a rare entity in children. Associated lesions may include soft tissue and joint defect, subsequent instability of the ankle, and growth arrest. We report here, the case of an 11-year-old boy, a victim of a severe trauma to the ankle, managed by an original technique. It combined a reconstruction by a composite iliac crest and gluteal fascia graft, an anticipatory Langenskiold procedure, and a serratus anterior muscle flap. This original technique proved to be a suitable alternative in this type of trauma.