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Density plots of lipid fraction (A) and collagen volume fraction (B) for all 45 pedicle screw breaches for cancellous bone, cortical bone, and the pre-cortical zone. In (A), the lipid content of the pre-cortical zone follows a binomial distribution in between the two bone types whereas in (B) collagen exhibits a dichotomous behavior in the pre-cortical zone. Abbreviations: PCZ = Pre-cortical zone
