Manda,
I am worried about that too. It seems to me and my logic tells me that if we can keep moving and doing exercises, fusion just can't happen. The problem is (with me!) that as soon as I am quite sore, I stop moving... Know that is just not what I should be doing. Have to exercise soon!
All of the best to you!

Ronel "It's not good or bad. We can't see the big picture."