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Crack surface densities for each type of microcrack. (i) Did not hit an osteon. (ii) Hit an osteon and were halted. (iii) Hit an osteon and were deflected. (iv) Hit an osteon and penetrated the cement line. (v) Hit an osteon at both ends. (vi) Osteonal. (vii) Pre-existing. Error bars represent standard deviation. Kruskal–Wallis one-way analysis of variance on ranks showed highest level of damage in interstitial and fibrolamellar bone. P < 0.05.
