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AKB: Biologische Physik

AKB 100: Poster Session I

AKB 100.44: Poster

Samstag, 5. März 2005, 16:45–18:45, Poster TU D

Texture analysis and 3D nanostructure of bone using synchrotron SAXS and WAXD — •Wolfgang Wagermaier¹, Himadri S. Gupta¹, Paul Roschger², Oskar Paris¹, Manfred Burghammer³, Klaus Klaushofer², and Peter Fratzl¹ — ¹MPI-KGF, Biomaterials, Potsdam, Germany — ²LBIO, 4th Med. Dept., Hanusch Hospital and UKH Meidling, Vienna, Austria — ³ESRF, Grenoble, France

Bone is a biological composite material, consisting of a mineral particle reinforced collagen matrix, whose structure is adapted to physiological requirements. However, the design of the bone material at the sub-µm level is still poorly understood. Specifically, little is known about the material-level structure of the fundamental unit of compact bone - the lamellar osteon. We have combined microbeam (1 µm) synchrotron scanning diffraction and scattering with sample rotation to reconstruct the full 3D mineral particle distribution within single osteonal lamellae. Several osteons around blood vessels in compact bone were scanned. On the basis of the SAXS data a physical model was used to reconstruct the 3D orientation of the mineral particles. The wide angle x-ray diffraction (WAXD) data were analyzed by means of pole figures to find the mean orientation and texture of the mineral crystallite c-axis. Our results show mineral crystallite orientation has a fiber texture within single lamellae, but shows a smooth spatial variation around the cylindrical core of the osteon.