Definitely check with your doctor, and maybe see a PT to get some rehab exercises.
At this time, I think moves like planks, supermen, cat pose with lifts of opposite arm and leg are the best ways to approach improving back strength.
Later on, you can get back in to more traditional strength work, but watch your form on deadlifts (and I recommend NOT doing the 'off the riser, low end' deadlift that Cathe shows in either GSL or Muscle Max, it is very hard for most people to keep their back in the right position for this...and even some of the crew round their backs some, which is risky on the lower back).