It's only the marrow that is wet. The structural part of the bone is non-absorbent.
The marrow can exert a lot of pressure. Many years ago, I had to have chemotherapy, and in between chemo rounds got marrow-stimulating shots to make the marrow ooze blood more and reduce the amount of time I was anemic. The associated pain in my large bones was the worst pain I have ever had.
Thanks for the kind thoughts, stranger. It was eighteen years ago now, and I am glad to have been here for those years!