Has anyone had or heard of cage movement? I'm 4 mos postop from ALIF L4/L5 with threaded cages and BMP. I got into a fix this week with pain that was putting me into tears. Went back to the NS and they did bloodwork and gave me an epidural shot. Today I had an MRI but am waiting for the report. I did bring home a cdrom. I know I'm not a doctor, but it looks like one of the cages is sticking out into my spinal cord. I have a bulge at L3/L4 and my L4/L5 area looks bumped out more than L3/L4. If this is what is wrong and causing all the pain, what can they do about it? I know I'm freaking without really knowing the true story, but I can't find much on the net about cage movement. I haven't fused yet and my NS was saying he thought I was having too much movement in the joint causing the pain. But after seeing the MRI pics, I'm worried that one has migrated out of the joint space.