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Fig. 1. —Method of measuring subperiosteal new bone formation is illustrated. Radiograph (left side of figure) of 3-month-old infant shows subperiosteal new bone formation along medial aspect of right tibia. Right side of figure is magnified view with superimposed ruler simulating ocular magnification system used in study. subperiosteal new bone formation in this infant measures 1.8 mm, a common measurement finding. Div = division.