Both sides move for me, but the spinal curve puts extra pressure on that left side and makes it super painful. Steroid shots help, but I have a wicked case of sacroilitis to go with it. A good chiropractor could straighten it all out and make my spine look healthy(ish), but mine retired and I haven't found a good replacement.

Ahhh I see you have the additional L6. For me, I have castelvie type 4. I also have pseudo articulation on both sides with partial movement on the right side.

Yep. Both sides have pseudo articulation, but the scoliosis makes the left one painful. I get steriod shots, and that helps. I also do a lot of stretching.