There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
Bear bones are extremely strong, even those of Arctodus. A. simus has more bone marrow/cortical bone ratio than bears of the Ursus genus, that is true. Yet, I seriously doubt their leg would break that easily simply by making sharp turns or trying to overrun. If these two things are done, it most likely would have resulted in a forward fall or sidewards roll instead of broken bones. Modern bears don't gallop as much, thus they can turn MUCH more efficiently than A. simus. Though, I'm not sure about running speed of both bears.