I am fused T5-L4 to correct scoliosis. I was riding in weekly lessons at the time of my procedure and I was back in the saddle (with surgeon’s blessing) at 3 months post-op. I was jumping again at 6 months. I’m now 12 years post-op and while I do compensate for my lack of flexibility, I don’t routinely experience pain – while riding or in general. Riding in a full seat at any gait is most likely to cause pain, but my tolerance for trot and canter is directly correlated to my core strength. I post the trot and use a half-seat at the canter, mixing in sitting work to tolerance. I also don’t even bother trying to sit the trot on a hollow, inverted horse. If the back isn’t up, there’s nowhere to sit anyway.
I am not a very competitive person, but I have shown in the years since my fusion. (Local & B rated hunters, IHSA, unrecognized horse trials, etc.) My back hasn’t played a role in that decision-making process. While not very competitive, I despise trail riding for the sake of trail riding, especially at the walk. Riding at the walk for extended periods is the one riding-related activity that is pretty much guaranteed to make me hurt afterward. (At the same time, I love to school in a field, do conditioning work, and generally ride out whenever possible.)
I do not have a leg length discrepancy, so I make a point to ride with my stirrups even. They don’t always feel even to me, but I think I ride straighter when they are even, regardless of my perception. I was receiving regular instruction both before and after my fusion, so I don’t think I ride more crooked than the average non-fused person. That said, I got very good correction and am relatively straight to begin with.