I don't know how your surgery/back problems relate to mine but I'm going to assume that they are somewhat similar. I had trouble training, walking, sitting, sleeping... living. I had severe nerve impingement, sciatic pain and massive leg pain on both sides all the way down to the foot. However, it did give me a good excuse to fly first class...I just told me wife I needed more room. More room for free alcohol.
The following is an excerpt from the Jim Wendler Forum - it is in response to a question from a forum member that wanted to increase his deadlift. It wasn't a specific question; more it was any suggestions that any of us had regarding the deadlift and how to increase it. Additionally, he also had a question regarding being weak at the bottom of the movement.