Midface distraction using spring scale attached to rigid external device.

Distraction osteogenesis has become an al-ternative technique for treatment of craniofa-cial dysplasias. The success of the halo distrac-tion device in the treatment of severe maxillaryhypoplasia associated with cleft palate patientshas led to the application of this device to treatmany more complex craniofacial anomalies.