A buddy of mine has a slipped disk in his back, and this may not be the best advice but he goes ahead and does all the core lifts. Cleans, squats, deads, and bench. For any lift where there will be weight on his back he puts a belt on as tight as he can, says it doesn't bother him. The only time he really complained about the pain was when he would go running, pretty strange, but he does just fine, and gets bigger.