I was put on Fosamax in 1997 after a total hip replacement and was told that studies show it maintains the bone growth around the implants (I later discovered this is not proven) Oct. 2005 I had a spontaneous fracture of my pelvis. After doing much research on my own I have discovered that others have experienced this as well. Still no warning on Fosamax insert. Apparently Bisphosphonates (Fosamax and Actonel and Boniva) cause severe repression of bone turnover which is what actually makes the bones strong. No one should stay on this drug for more than 5 yrs. You do not lose any of the gain you have gotten when you quit as Fosamax stays in your body forever.......GREAT!