Doctor here! Fracturing bone does not predispose it to osteoporosis.
Bone is dynamic and living. It remodels (and fortifies) itself according to forces exerted on it!
This implies we can mold legs to be different shapes (for what devious purpose I don’t know).
I look forward to scampering around the house on four sharpened bone legs like some kind of horror movie esque spider beast when I'm an old man - it will be an excellent way to terrify the grandchildren.
For some reason my first facile thought was: to add cupholders