Curved Spine (Scoliosis) - Operate or Not?

The hospital has yet to call to fix the appointment for Mikaail's scoliosis operation.  Previously the doctor said will be in early 2011.   It's now mid Jan and I have not heard from the hospital.  I didnt follow up as I am unsure whether to proceed with the operation or not.  At the back of my mind, I know that with the operation, he will probably be in pain for a bit but in the long term, it will be better for him as he should be able to breathe better.  I am just afraid if there will be any side effects or screw up!

His rib cage on the right side is protruding.  Actually when he is seated he tend to be resting his weight on one side.