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Fig. 2. —Drawing shows three separate regions in distal femur that were independently analyzed. Region 1 (predominately cancellous bone) was defined as rectangle beginning at anterosuperior edge of and extending posteriorly one half of distal femoral width across growth plate. Region 2 included full width of femur, extending proximally from top of region 1 and encompassing transition from metaphyseal to diaphyseal bone. Region 3 (predominately cortical bone) was defined as extending proximally from top of region 2. Height of rectangle in all regions was twice that of diaphyseal diameter. y = diameter of femur proximally; x = width of femur distally at growth plate.