Sometimes with a back injury(I had a Neck injury where this applied) the best answer is to start training again(assuming you quit) LIGHT, and build the reigon back up. If it was a spinal injury of some sort, then chances are that it will still hurt even after it has healed, being that there are nerve-endings involved. In that case, the best thing to do is to start trying to strengthen the muscle-reigons around said spinal injury, in order to stabilize the spine in that area.
The reason I had neck problems was because I trained heavy as fuck on Delts, while doing probably HALF of that workload for Traps, and ZERO for Neck. When that happens, you are asking for an injury because you have the delts being able to train with weight that the supporting muscles(Traps & Neck) can't handle. This is one of the reasons that you have to train areas like Neck, which alot of people avoid. It is also one of the reason that each area of the body needs equal amounts of attention from a muscle-strenthening perspective. Maybe that applies to your problem bro. Maybe not. Good luck though. Ibuprofen will help you get through those routines though in the meantime.