That is also something I am not sure about. But I know the a few days lates, there is blood vessel grownth forming a jelly-like matrix
Then  ithin a few days the blood vessels expand into a jelly like material of a blood clot.
My brother just broke his arm, I wonder how much time he will have a cast. A bone fracture is a medical issue when there is damage to the bone continuity. How do bone fractures heal ? I am not sure about the whole healing process, but I do know that blood coagulates and forms a clot, that is situated between broken fragments But what happens to the blood clot if the bones move ?
Within a few days, blood vessels grow into the jelly-like matrix of the blood clot.