Figure 3. Relationships between density and orientation of the trabecular structure and the magnitudes of the various moduli and their principal mechanical directions. (A) Relation between bone volume fraction (BV/TV) and Young’s (E_1,2,3) and shear moduli (G_12,23,31) relative to the 3 principal mechanical directions. (B) Relation between principal structural direction (angles _MIL and _MIL) and principal mechanical direction (angles _E and _E). For each graph, n = 44.