Quantitative Analysis of Small-Angle X-Ray Scattering of Bone: Determination of Sizes of Its Collagen and Apatite Components

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Abstract
The diffuse anisotropy scattering from oriented bone sections is quantitatively studied on the basis of recent developments in small-angle X-ray scattering (SAXS). This SAXS from the bone is explained as a random distribution of apatite rods with a preferred orientation of the principal axis of the rods parallel to the longitudinal axis of the bone. The results obtained suggest that the average cross-sections of the apatite rods and the collagen components are 40–55 A and 75–105 A, respectively, which indicates that the apatite rods are within the collagen fibrils.