Yep, except it's more "front-to-back" for me. My left sitz bone sits a little further forward than my right. I think it's something to do with a very small femur length discrepancy that shoves my hips out of alignment, though I've never had a formal diagnosis of such. My overuse-type injuries tend to be on my left side too.

We're all a little crooked, I think. I find that it gives me less trouble when my flexibility and core strength are good. Hooray for yoga!