PMC4438594_01
Steps for calculating stiffness of trabecular bone cylinder of rat vertebra.
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F1
Except for Conn.Dn, all structure parameters were also calculated two dimensionally (2D) from cross sectional images slice by slice, along the longitudinal direction from caudal to cranial (Figure 1), and graphed with respect to the normalized height of the cylinder. Thus, it was selected for FEA (Figure 1).
Calculations of the index of stiffness (k/k').
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F2
Therefore, values of k were further normalized with the theoretical stiffness (k'), which was calculated from the size of each cylinder by assuming that the cylinder was solid (Figure 2).