I've never been injured in any kind of crash, but I managed to get injured on a school trip to the Lake District. If any of you have ever walked Cat Bells, or from Derwent Water to Watendlath, you will know what I mean.
There was rather a steep slope, with steps down it. However, these steps were slate, and it was raining, I had hired boots form teh school, and they had little grip on them. I slipped on the way town, spun round and gashed my leg on the edge of a slate. I bled quite heavily, and still have the scar. However, it was 6 hours. six hours before the school sought any proffessional medical attention.
BTW, I still walked Cat Bells in this condition, and was not troubled by it, while amny other with perfectly healthy legs found it a struggle.