Good morning,
I began to have muscle pain in the middle of my back on each side of the fused spin. As time went on I would get a massage to see if that would help. It never did. I was in constant pain. I would wake all during the night in pain. I couldn’t enjoy standing, walking, gardening or even riding in a car. I knew the SI joints were a problem. It can be one side or both when could be the pain generator. Mine was both. I’m going on my 4th after surgery and still no pain.
I’ll be happy to answer any questions you have.