i wouldnt do it
A 30 degree curve is very manageable with conservative measures such as PT, pain management, exercise, etc. I would not go through such a serious, I repeat , very serious surgery that is NOT guaranteed to decrease pain or cause any complications with a curve such as yours. Keep monitoring with xrays every year with an orthopedic surgeon. You may be surprised and not progress!!
May 2008 Fusion T4 - S1, Pre-op Curves T45, L70 (age 48). Unsuccessful surgery.
March 18, 2010 (age 50). Revision with L3 Osteotomy, Replacement of hardware T11 - S1 , addition of bilateral pelvic fixation. Correction of sagittal imbalance and kyphosis.
January 24, 2012 (age 52) Revision to repair pseudoarthrosis and 2 broken rods at L3/L4.