I hope I can help a little. I'm not a fit expert by any means, and don't know much about back injuries. That said, I'd maybe try a touring bike, with a more upright posture than a road bike, with some easy gears so you can spin uphill. You'll want a rack and panniers to carry your stuff (so you won't need to carry things on your back, which sounds like a bad idea for someone who just had surgery).
Something like this might be a good bike to test ride:
http://www.surlybikes.com/bikes/long...cker_complete/



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