I'm glad you're relatively OK, nice x-ray!
I did something similar Saturday in Jimmy Lewis' class. We were practicing locking up the front to see what it felt like and how to correct. On my last time around or so I went too fast (I was getting a little frustrated at not being to lock it up like I wanted) and when things started going south I didn't release the brake. duh. Always, always carefully follow Jimmy's directions. Anyways, I hit the lake bed hard on my left side with my ribs, then knee and elbow. My ribs hurt then, but not too bad. However, as the day went on they got more and more painful so I sat out a few times and didn't do as much practice as I wanted. That night I could hardly drive my car to dinner and had a heck of a time rolling over in bed - thought I was screwed for part 2 of the class on Sunday. Fortunately, with some Aleve, the pain let up pretty well for Sunday, but I got pretty sore again driving home.
Anyways, it wasn't a high side or a low side, but a slam!
Hope I learned my lesson!
In your helmet, no one can hear you scream.
Old(ish) Chick on a Bike
V-Strom 650 Adventure "Maxwell"
DR-Z400s "Little Donkey2"