I noticed after taking some new pictures yesterday, our recently rescued beardie, Tyler, he has a divet down his spine from the back of his head down his tail. The above photo is the only one where you can really see it.
It looks like that's just the shape of his back along the spine. I don't see any abnormal twisting or deformation that would be associated with something like MBD. He also looks to be a pretty good weight. His arms and legs are nice and full. Are you enjoying your time with your new buddy so far?