Hi, I have friend [removed] . She had scoliosis as a girl and had back fusion when she was 11yo. She's 30 now and has not had further problems above or below her fused vertebrae. I was thrilled when she shared this with me. I had back and neck surgery this year, but my fusion was in my neck, not back (my back was a lami). Even so, I worried about the future weakening b/c of my own fusion. It was a boost to hear from someone I knew that her experience was one of the better outcomes. I hope it helps you to hear this, too.
Meghan