Hi Misty,
I would really urge you to go ask Dr Dick many, many questions about the planned surgery and specifically how he chooses what levels to fuse, what he thinks will happen to your L5/S1 level and pain if that is left unfused, and how the curve and levels above the fusion will fare if left at this point. I would think your L5/S1 disc should be perfect if he plans to leave it. You want to ask what your outcome realistically will be with the shorter fusion.
I'm just a patient, but looking at your X-rays I would have expected a longer fusion, more like at least T10-sacrum. As an example I had a degenerating 47 degree lumbar curve that required fusion T8-sacrum at age 42. I met two other surgeons who wanted to do smaller, 2 level fusions at the time, but upon being pressed for outcomes, they both said I would need the bigger T8-sacrum within a year or two, so I decided to bite the bullet and have it done right the first time. The reason they gave for doing the smaller surgery first was that "I was too young" to be fused to the sacrum.
I know you didn't ask, but please reconsider getting a second opinion from somewhere very qualified like Twin Cities. There's no rush for this surgery, and you need to commit to it fully informed and with eyes wide open about what to expect. Even if you have to cancel your upcoming surgery date, don't worry, this sort of thing happens all the time. It is your body, and you need to be 100% sure you're choosing the right surgeon and the right surgery for you.
Gayle, age 50
Oct 2010 fusion T8-sacrum w/ pelvic fixation
Feb 2012 lumbar revision for broken rods @ L2-3-4
Sept 2015 major lumbar A/P revision for broken rods @ L5-S1
mom of Leah, 15 y/o, Diagnosed '08 with 26* T JIS (age 6)
2010 VBS Dr Luhmann Shriners St Louis
2017 curves stable/skeletely mature
also mom of Torrey, 12 y/o son, 16* T, stable