Sarah - you crack me up! Not that you hurt yourself, that your are so funny writing about yourself. How are you?
Korie - sorry I didn't see your post. (I'm a T6-7 fusion in 2/07, scheduled for revision in 1/08)
1. How did I know something was wrong? My back improved for a while (3-5 months after surgery, then started getting worse. I had pain on the left where I never had left sided pain prior to surgery. The radicular pain was worse on both sides. It increased with any movement and the severity progressed to restrict my movements to virtually nothing. I joke that I live like a cat. Folding a load of laundry lanRAB me in bed for a day now. I cannot stir soup or chop carrots without a day or more of pain. Bending side to side or backwarRAB (even slightly) or twisting is excruciating. These are signs of non-fusion or a hardware problem. A myelogram confirmed that there was no fusion.
2. Why revision surgery? You have to have fusion. The hardware I have in is not designed to hold in the event that I don't fuse. In fact, I hurt because the hardware is loosening. Once you go into the spine and start messing around, fusion is the ideal outcome for long term stability. So, this revision surgery in January will try again for fusion. I'll probably be asking for some good thoughts from the board when my time comes!
BTW, my doctor totally supported me hiring a personal trainer to get an exercise program tailored to me. I'm calling tonight! I know it will be very low-key, but I hope it will help keep some tone. Should I let you know how it goes? I used to run half marathons and lift weights! I'm a little stir crazy!!!
I hope that answers your questions.

Margaret