Microstructural features such as osteons and cement lines are considered to play an important role in determining the crack growth behavior in cortical bone. Cracks that penetrate the osteons may lead to complete failure of the bone [1]. On the other hand, the cracks that are deflected into the cement line slow down the crack propagation and increase the crack resistance of the bone. Although various factors were reported in the literature [1–4], the underlying mechanisms of crack propagation behavior in cortical bone have not been completely understood.

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