I used to play football, had quite a few injuries.
Whilst playing in goal I made a top corner save and on my way down I knocked my shoulder blade off, which is very painful. The worst I've experienced was a stud tackle to my knee, which as left it very weak and I actually refused surgery to correct it because the risk was quite high in terms of repercussions.
Thankfully those are the only major one's, I've broken my arm while playing tennis in my parents backgarden when I was kid with my brother. Sprained many parts of my body, pulled muscles.. Sports can be very dangerous! :/