After four years the leg pain started and worked its way up to the but then the lower back.Thinking that after a S1-L5 fusion you could not get sciatica pain back I was wrong. Three more years past before I found a Dr. who said it can happen and ordered a CT as you know with a MRI you cant see any of the surgery site. CT confirmed that bone growth had occurred and has been pressing on the nerves for so long that there might be nerve damage. Also L4 is collapsing and will have to come out also not fully seen on MRI due to the metal interfering with the resolution. Not blaming any one things do happen for a reason I am just glad someone found it and I can get some relief. And happy to send this along to others who might be in the same boat.