Yes, this happened to me in 1984 when I was 11. My parents weren't with me and at the time I was a shy girl and just went along with whatever I was asked to do.
It's only years later that I have looked back and thought this was not quite right, although in the 80s maybe it was?
Juvenile Idiopathic Scoliosis diagnosed aged 6/7
Milwaukee brace 1980 - 1984, Fused T2 - L3 with Harrington Rod 1984, 10 rib costoplasty 1999, artificial disc at L3/L4 2003, extended fusion to L5 2006.
2015 - Sagittal plane imbalance correction by insertion of 30 degree hyperlordotic cage at L5/S1 level (anterior approach) with fixation to pelvis (posterior approach) now fused T2 to sacrum.
2017 - October - SI joint fusion - left side
2017 - December - Revision of failed left SI joint fusion