First a little background,
I had my surgery on 9/11/2010. I was in an accident where my L1 vertebrae was completely shattered and therefore needed to be fused. So, now I am fused two above and two below. That's a lie, my bottom two screws actually broke. Now, after multiple CT scans (and X-rays and MRIs) my doctor has told me my spine is totally fused. He says nothing changes through the months between scans and it all looks exactly the same. So, it is safe to go back to working out but being very careful. I asked him about running and he told me I can run SOME. I'm not entirely clear on what the category some falls under but I was hoping to run maybe a mile or two a day. I run with my gym, usually only about 400-800 meters if I do at all. The issue I have is that he told me to use the rowing machine (or an elliptical or bike - which my gym does not have), but that tends to bother me more.
So, my question is how much is too much running? I'm not doing any marathons and triathalons or anything like that, just a little running because that was when I felt my best (this was actually after my surgery, about a 18 months).