Hi Kimberly
I also look forward to hearing from anyone with spinal fusion. I have no personal experience with the procedure, but have a friend who just had a similar operation. She is taking things very slow. As always, it is best to follow the advice of your physical therapist. Every body is different, so you will have to experiment, pay attention, and see how it goes for you.
I did write an
article a while ago on back pain. it doesn't strictly apply to your case, but the yin yoga flow there might be worth trying once you get the okay from your health team. Obviously your range of motion will be restricted, so now is not the time to try to gain lots of mobility. Strengthening is more important (check out Stu McGill's
Big 3 exercises for good ways to do that. I discuss them in my recent book Your Spine, Your Yoga).
Good luck, and let us know how it goes!
Bernie