Almost the same thing happened to me about 20 years ago on a Schwinn if I remember correctly. My buddy and I were being dumb kids and riding on a trail in the woods way beyond what our experience could handle.
Hit a stump, the wheel bent and I flew over the handlebars. My elbow came out the back of my arm and I walked home to mom in complete shock.
To this day I have about a 10" railroad track scar, my left arm is full of metal and won't bend straight.
Won't get on a bike anymore, now I switched to playing with firearms in my spare time, much safer hobby.
Might have struck a heavy ant or worm [/sarc off]