Personally, I had a debilitating shoulder injury, couldn't put any weight on my right arm at all, and one of my yoga teachers put me on the path of fixing it up. Same with a low back injury, I couldn't even sit at one point and she helped fix me.
I'd 100% recommend someone with back pain visit a highly trained yoga or Pilates teacher. Some Pilates studios even take health insurance, since some are considered PT.