Résumé : This is a report on a patient who suffered a large skin, muscle and bone defect of the leg following a Volkmann's ischemia. The authors' indications for a flat crossleg flap are explained: extended skin defect at the anterior and inner aspect of the broken tibia or a skin defect associated to a tibial defect making a secondary bone graft necessary. Finally the authors describe an original technique of crossleg flap: this consists in a trapezoidal flap with the large side being the implantation basis.