Investigations of the mechanical properties of the spinal cord at high strain rates for computer simulation model of the spinal cord injury

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In the present study, we made the original high speed tensile equipment(Maximum crosshead speed 1, 000mm/s), and investigated the mechanical properties of the pia mater(postero-lateral sulcus, posterior median septum, dentate ligament) andspinal parenchyma(gray matter, white matter), which are the important parts to analyze the stress distribution within the spinal cord. The results exhibit the characteristic nonlinear and viscoelastic stress-strain response, in which the stiffness of the material increases with strain and strain rate. Furthermore, the gray matter is stiffer but fails at a lower mechanical strain than the white matter at high strain rates.