What is the prevalence of vitamin D-resistant rickets (X-linked hypophasphatemic rickets)?
Approximately 1 per 20,000 live births.
What are the characteristic radiographic findings of rickets?
Cupping, fraying and splaying of long bone metaphyses. Widening of the zone of provisional calcification.
After 2 weeks of treatment, there is new bone formation in the zone of provisional calcification in the distal femur and proximal tibia, and is consistent with healing rickets.