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bone healing

Darren Tanke wrote:

> two bones together. The injury was so severe, I can see no way how
> the animal could have walked on all fours as hadrosaurs are often
> depicted. It would either have had to hobble along in a tripodal
> stance or move bipedally. This is the first I am aware of a forearm
> fracture in a hadrosaur that involved both elements.

How long does it take to form a repair such as this? Months, surely?
Could any quadrupedal animal injured in this way survive long enough
for the bones to heal? Seems unlikely, it'd be a preferred target for