I've been pretty lucky over the years I think.
Broken arm at age 6 from being thrown off a donkey. My parents thought it was a good idea when I asked for a horse to buy me an intact male donkey off the side of the road. They put me on him, without anyone actually ensuring he was ridable, with no saddle, no helmet and only a halter.
Plus I had NO riding experience. So that ride lasted about 2 minutes and resulted in him bucking me off and I landed on my arm. Oh well. It healed and I still rode that %$@& donkey even with my cast on.
I would say the only other somewhat serious injuries were from two falls off my riding horse I had as an adult. One was my fault, one she got spooked. Each resulted in a concussion and the second one was worse. Headaches for months, nausea for weeks, and also had a lot of deep bruising on my hip and my back still hurts every now and then to the point I have to stay in bed for a day or two. After the second fall, I decided riding over 40 wasn't for me and maybe I just needed to stick with my minis.
My riding horse was also trained to drive single and double so I sold her to a man that needed another Belgian to make a team with his existing mare. She's happy and I still get to see her, but even though I'm tempted to ride her a bit when I go visit, I resist the temptation as it's a LONG WAY down from her 17.1h back!
Other than that, just lots of kicks, stepped on toes, bites, etc from various minis over the years.