But it is. Her leaning to one side and having one leg shorter than the other was noticable to outside family and the doctors . But than isn’t bad enough for a person to receive the operation. It was the way her spin was twisted (not visible to the human eye only by x-ray) and that she needed 4 disc removed  that they performed the surgery. Same goes for myself, I too have scoliosis and I have seen myself in the mirror many times but never noticed anything until my fysiotherapist told me where to look.