Injuries to me are fairly minor, nearly pitch polling a H16, as I swung forward on the trapeze, I managed to make sure both legs went the same side of the mast, which is always my main priority, then as I swung back toward the boat my legs struck the front beam, leaving two dents on my shins for the rest of the year.
The first time I sailed my own H16, we capsized, as we righted the boat, the crew was looking up to grab the dolphin striker, but was still under the hull, the hull came down hard on his face, potentially very dangerous, but luckily he got away with a black eye and some bruising.
The worst injury I heard of was to our old commodore, I believe he was trapezing at the back of the H16 and slipped, he landed on his butt on the corner of the rear corner casting so heavily that he needed stitches , and I am told by him that due to the place he landed the stitches were practically internal, ouch!