I hadn't thought of that...guess it would depend on how it healed...for me, I fractured mine twice, but it didn't seem to be a factor during my labor
well google has become my best friend and worst enemy lol and I googled and it said baby could have gotten stuck if your tailbone didnt heal right so i was kinda paranoid
PS - I went through a 36hr labor, was induced 28hrs in because I was only 3cm dialated(if they didn't, by the time I could push I would be too tired requiring a C section), . I had one shot of Demerol that lasted two hrs (I slept two hrs, woke up when it wore off). After that, I hit transition au natural and pushed au natural. It can be done if you want :)
I cracked my coccyx (buttbone) rollerblading at 12yrs old. When I had my daughter at 16, the labor felt like it started in my lower back and wrapped around to my front. I guess you could say I definitely had back labor. I'm 20 weeks now and 32yrs old, and my lower back is already pinching if I lay down too long. I wanna say it's from the injury, but I have no way to be sure.