I have had 2 bone grafts in my one foot.  The first one did not heal well and eventually broke down causing a non-union between my toe and metarsal.  I have had a second graft done and am 5 months post op and although it is healing - progress is slow.  My doctor thinks that the fosamax I took for 8 years is the cause since it basically freezes bone and apparently causes the formation of new bone to be slowed.  Is there any study as to the truth of this?  Note:  I went off of fosamax 2 months ago and since then healing seems to have progressed better.  Any information would be appreciated.  Also note that my last bone density indicated Osteopenia