N.G.
I by no means have experience in this area but your question topic sparked enough curiosity for me to read your post. I have a good friend who injured her tail bone in high school basketball and to this day, if she sits for a long time, it hurts her. She told me it was pretty common, she also played college ball and a lot of her team mates have the same injury.
Not sure how you could market to that demographic, because your services are pretty specific, making your focus demographic relatively small. That makes marketing difficult, I'm sure.
People do tend to go to chiropractors for lots of issues so why not a general practice? Just a thought. Good luck with your endeavor!!