SummaryThe energy absorbed in the impact fracture of bovine metatarsal and metacarpal bone was shown to depend on the aspect from which the inpact specimen was obtained. In a majority of cases caudad specimens were more than an order of magnitude tougher than cephalad specimens and the fracture surfaces of the tough specimens were fibrous or woody in appearance due to osteon pull out. This pull out phenomenon was identified as a major factor in determining the toughness of bone and is analogous to the toughen…
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