I was most happy to find this forum discussing leg cramps following an epidural and/or steroid injection.
I had an epidural last Thursday to relieve pain in buttocks, hip and leg down through the knee. A MRI revealed severe irritation/inflammation of the L4 nerve. I had not slept much in nine days because of severe, all-encompassing pain and this appeared to be the only way to get relief. Nothing else had worked.
It was interesting to read about the number of people who have had similar experiences.