All I have done is cut open my left shin when I was about 10. This was the result of my first attempt at jumping I landed on a lump of broken concrete and it split open my shin so I could see both bones in there. 10 proper stitches in a 10 year old sized shin is quite big. Only had one day off school too.
Oh and Ive tore my ball bag again while jumping but I was about 18, hooked up the back wheel landing a double and bent the saddle then landed my balls on the tyre I was only wearing thin football shorts that offered no protection. My balls got pulled in between the tyre and the seat stay and the only way of stopping was with v brakes! I limped off behind a tree to inspect myself came back with my hand covered in blood and decided to go home. It was a two mile ride because we didn't have mobile phones then.
Oh yes I also still suffer 10 years on from having got whiplash down my back when (you guessed it) jumping again. I'm in constant pain from it. Nice.
I think that's all.
Not really hurt myself properly for some time now but I have a feeling I will if Llandegla is open on Monday.