Mandibular callus distraction was performed on 14 patients. In addition to established radiological methods, sonography was performed to monitor the clinical progress. Ultrasound shows a precise picture of all interesting items in distraction treatment. Although the value of radiographs is not obsolete completely, sonography was found to be a meaningful supplement in the clinical monitoring of callus distraction. Furthermore the method is capable of early recognition of complications and it can reduce X-ray exposure.