I was reading another one of your posts on another board and you started out where I did, cysts. They thought that my pain was cysts, but in the end, it turned out to be SI Dysfunction. The ligament that runs around from the lower back to the groin, was torn. This whacked my SI joint and caused arthritis in my back. The SI Dysfunction won't show on a X-Ray or MRI. They do a simple leg raise test. You don't even have to go to the doctor to have it diagnosed. You can have a friend do it for you. Lie on your back (on the side of the bed), legs straight out, have someone stand beside you while you raise your leg staight into the air. They will have their hand on your SI joint (where the dimple in your butt is on the same side that you had the pain in the groin area). If it hurts like heck when you raise your leg, you might have SI Dysfunction, or just tight ham strings.
I would have never put groin and back pain together, but one of my doctors finally did after I had a work related accident. I had spent years complaining of the groin pain. They just kept sending me to the GYN. The GYn just could not understand why removing the cysts didn't stop the pain.
When you go to a spine center, their job is to find your pain. Make sure that you tell them about the cysts.