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. 2024 Dec 16;13(24):7652. doi: 10.3390/jcm13247652

Figure 2.

Figure 2

In this radiographic image of the metacarpal bone, the solid white line (upper line in the figure) represents the periosteal (outer) diameter, and the dotted white line (lower line in the figure) represents the endosteal (inner) diameter. These measurements are taken at the midpoint of the diaphysis. Cortical thickness is calculated as the difference between the outer and inner diameters, and the cortical thickness rate (CTR) is calculated by dividing the cortical thickness by the outer diameter.