I also wonder if you hear about injuries in a well kept facility, where they look at their horses multiple times a day, and not at junky facilities... because they never look at their horses to notice a scrape, and it heals before you hear about it.

My mare has never (knock on wood) been really injured, but regardless of where she is, she gets a whole lot of scrapes. Also, she's low horse on the totem pole, but some of them (just walking, she got distracted and walloped her hip against a door frame and gave herself a big old scrape) are just her being a klutz. I'm always finding a new scrape on her legs.

A friend in high school had an exmoor/shetland pony that got himself in the most awkward of positions, and never ever a scrape or bump. They left a 1' gap between edge of fence and barn (I forget why, but they figured it was too small for the horses), and we would ride the school bus to her house and find the pony out grazing on the lawn. He must have squeezed himself through the gap, but never a scratch.