My 2 cents
Amanda,
You are smart to monitor your curve. If you are not in pain, and the fusion is solid there is no reason to go through another major surgery. Definitely keep your xrays and the measurements of your curve so you will have a record for the future if things change.
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.