I am 4 days out from L5 S1 fusion. My back feels great and overall I am doing well - very little pain. What I have notice is some cramping in my buttocks and weakness in my left leg. I have to use the walker to ensure when I first stand I don't crumbling to the ground. I assume this is standard muscle adjustment and certainly doesn't feel like nerve pain. Anyone else experience anything like this? Thanks in advance.