Go see a Doctor or maybe a personal trainer who has experience with injuries. A forum isn't a good place for this. I have no idea the scope of your injury and do not have the knowledge to safely point you in the right direction other than what I aid in my first sentence.
I've had a bad back for many years. When I try to stay in posture with a chest turn, I always tweak my knee. I am not sure if I should rehab by knee or work on the lack of flexibility/bad back.Either way, would love suggestions on exercises. Cheers, SG