My son broke his finger trying to catch the ball when he was about 8 or 9. He also broke his patella coming down from a jump ball on turf when he was about 11. We had another kid on our team slam his knee into someone elses and had to stop football for a while to let it heal (wasn't broken just really badly bruised).
Sounds like you just had a very unfortunate event happen.
I've coached 16+ seasons of football and I can only remember a handful of instances where there were serious injuries.