I broke my ankle when I was 16, and didn’t know it until I was 43, when it “went out” on me-- it would every so often behave as though it had a bad sprain, even though I hadn’t done anything to it, except maybe bump it slightly, or step down a little hard.
Anyway, there was a loose bone fragment and evidence of a very old fracture.
It must have been the very bad “sprain” I had when I was 16. I jumped down hard on it, taking too many steps on a long staircase at once. It hurt, but I could walk on it. Then it went numb. So I continued to walk on it. The color was fine, and the foot had a pulse, and it was warm. I iced it, and wrapped it like it was a sprain. I slept with it up, and the next day was a Friday. I couldn’t walk when I woke up. My aunt called into school for me, and did everything to drag me to a doctor, but I said I’d had sprained ankles before, and I was sure that was all this was. There was some distraction, like my cousin having chicken pox, or something, so she didn’t force me to go.
By Monday, I could walk. I limped, but I walked. It took about two weeks before I wasn’t limping, and I bought one of those heavy-duty braces at the pharmacy, but it get better.
I biked all over S. Indiana on that ankle in my 20s, and hiked all the state parks. I did Army basic training on it, including the running, and never thought twice about it. I wore heels flats, took some dance classes, lifted weights over my head, got a blue belt in Judo, and just once in a while, maybe every other year, it would “go out” on me. It got worse in my 30s, until it happened when I was at home with my toddler son while my husband was away on his two weeks with his Reserve unit. When he got back, he dragged me to the doctor. They put in an aircast and gave me crutches, asked me if I needed codeine, and referred me to an orthopod.
So, it is apparently pretty easy to mistake a break for a sprain.
I had surgery, and my ankle no longer “goes out.”
ETA: Worst pain I ever had was my tonsillectomy when I was 34. C-section was in between the tonsillectomy and breaking the ankle. The post-surgery pain on the ankle was actually worse than the break.