I too have Scoliosis, little back ground on me. Had surgery in 1991 to correct it, long story short, I still have a curve, but it had stopped move so all is good. I think at the age of 31 I have about 43 degree curve.
Not really sure what the doctor will say. If it doesn't hurt your son, I don't see why he count ride them. I don't ride Splash that often due to I don't like getting wet. But I have never had a problem with it. Never gotten hurt and never felt pain afterwards from riding.
BTMRR, I have no problems with that one either. Out of the two my guess is this would be the harder one to ride, because you move around a lot more in your seat. If that would be a problem for your son, maybe you and hold him close to you while you ride. That sometimes help.
I know you didn't ask, but here are some things I do to make my trips better. Good pair of shoes, I found a running shoe store locally and finally at the age of 29 found good shoes that really do help take the pressure off my back. I guess when you give up style for comfort you can find a good pair. lol I assum since he is 4 he may have a stroller and that would help.
I find that anything memory foam helps. I love the relaxtheback.com. Bought a wedge to sleep on while in hotel rooms and it helps a lot. If you are staying at a Disney value or mod hotel, you may want to get your son something to put on the bed to help sofen it. I just came back from Pop and my back went out on me and the beds were bad. Love Pop hate their beds.
I too have found the memory foam seat couchions very helpeful. Make any seat better. Now Im older and weigh more then your son but it took me years to find these products so I like to share.
I hope you and your family have a wonderful trip. If there is anything I can help you with, just ask. I be happy to help, Ive lived with Scoliosis for almost 20 years now. Wow time flys.
