I've been racing motocross and desert since I was real little, so I've racked up a few... Broken both ankles (right one twice) which just leads to them getting sprained a few times later, dislocated right knee, exploded my left hip, broken my right collar bone 5 times (it's all misshapen and twisted now and sticks up where it doesn't belong), broken left collar bone once, and more concussions than i can remember.
I also tweaked my lower back in a car accident when I was 18, not sure what happened but I think it was just a sprain or something cause the swelling went down pretty fast.
Some of these happened after I got out of the Marine Corps but it was pretty funny; I had to wait for a special day to go get processed through MEPS because some medical specialist was only there a few days a month and they wanted him to see me cause so many joints are messed up. He signed off on me though and said I needed to stop racing haha.