I have had 3 spinal surgeries in 4 years. I am not able to walk without pain in my lower left leg. Pain is present even during sleep, usually awaking me. Doctor has performed a nerve study . Results show significant problem in the L4-L5 area with resulting pain in upper left side of leg to lower left leg even down to ankle. Ortho Surgeon is now recommending a CT Scan with Myelogram injection. Will this procedure finally give some answers to the continuing left leg problem or will this procedure damage anything now existing in my spine. Prior surgeries have removed bone and cysts, etc. from left facet joints in L3, L4, L5, S1, yet the nerve pain remains. What do you think is going on in my spine?