11 patients were treated for severe mandibular prognathism or maxillary retrognathism with a one-stage procedure combining Le-Fort I and sagittal-split osteotomy of the ramus. Clinical and radiographic check-ups were done at 3, 6, 12 and 18 months after the operation. The evaluation was based on the measured base angles and distances between the planes passing through skeletal key positions of the visceral cranium and the resulting soft tissue positions. The esthetic and functional rehabilitation obtained was good. In 3 of our patients the skeletal relapse rate was 1.1 mm.