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7mm. Using two-way ANOVA, there were significant sex differences for needle distances (p=.001), and full and limited sacral curvatures (p=.02, and p=.046, respectively). There were no significant linear regression correlations between age and sacral curvature, needle distance, canal area, or hiatus width. Therefore, despite a frequently prominent full sacral curvature, the combination of S1-S2 dural sac termination plus a relatively straight trajectory of the lower vertebral canal between S2 and S4 support the theoretical feasibility of