I just wanted to comment on your post here so it would be relevant. You're likely right on point about
the treadmill. When my PT had my try - and I emphasize the word "try" - it, I was about
a year out from surgery. He was really trying to get me moving, as I wasn't even doing a lot of walking (I think it was winter here at the time and thing is I have a great treadmill at home that hasn't been turned on since I fell in 2004). After I had done a lot of stretches and such he had me get on it for 5 minutes at .5 miles/hour which drove me crazy as I used to do 3.5-4.0 mph! But he insisted - nothing faster. Well, I left that night hurting more than when I went in, and the treadmill had aggravated all the nerve pain, so that was the end of that. I love my PT, but I've had some bad and dangerous ones over the years. That's why now I'll only go to him.
I will say he did help immensely with putting my SI joint back in place very gently. I can pretty much tell now when this goes out because my pain in my feet (oddly enough) flares like crazy, and he will see me at no charge and just roll it back in place. He said he learned all these tricks over about
40 years of experience and training, starting with being in the military.
But SE what might be relevant for you is that my PT really worked more to ease the muscles around the incision, and try to keep scar tissue from forming. But it was mostly all passive modalities like ultrasounds, heat, stim, and some massage. That might be worthwhile if you again can find a PT very experienced with post-fusion patients, and who isn't going to try to push you for exercise, just help with healing. Unfortunately the insurance companies often don't like that because they like to see "progress" usually meaning more and more activity. And straydog I really think has that right that a lot of times PT can aggravate more than help. It's all in the skill, experience and philosophy of the PT.
Oh - Birkenstocks, anyone? I have tons of those for summer to slip into, and did manage to find some mules (slip into shoes in case guys don't know LOL) just before my surgery made by Rebock and I'm on my second pair. They have ties so you can keep them snug, but you tie them once (even on your lap) and that's it. Then the rest is just like crocs, which I don't own yet but may one of these days.
SE I'd watch the flip flops. Just my thoughts but I think those of us with back issues need something with more support or cushion.
Ok, I'll stop now!