@gently has added this interesting idea on porosity vs density, flexibility vs strength, on a few threads and I am intrigued.

Personally, I have found that as my DEXA improves, I feel stiffer: reaching and lifting, for instance, cause a different kind of pain. Of course I already have several fractures and wonder what consequences there might be after making those compressed vertebrae, more dense. More stable but with less give?

Anyway thank you @ gently for this interesting addition to discussion which I intend to discuss with my doctor.