Compression Tests on Spongy Bone

S. Baivier, P. Drazetic, and E. Markiewicz (France)


Compression test, quasi-static, spongy bone


An experimental protocol is set up on spongy bone to identify the mechanical parameters for FE modeling of the human skull. In a first step, beef ribs are used. The structure of the rib is comparable to the skull’s bone structure as it consists of two layers of compact (cortical) bone separated by a layer of spongy (trabeculare) bone. The spongy bone is a complex network of intersecting osseous spans (trabeculae), where the space in and around the trabeculae contain bone marrow and fluids. Quasi static compression tests, density and rate of mineralization measurements are performed on cylindrical specimens of spongy bone. Compression tests in opened cells make appears three stages in the crash response and result in the extrusion of fluids and marrow on the third stage. Other compression tests are performed on closed cells to show the effect of the fluid and marrow during the second stage of compression when the osseous spans break. Finally the results of compression tests on opened cells for 97 specimens, are analyzed in terms of dispersions and correlation with physical parameters such as density and rate of mineralization.

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