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I don't know if it really counts as broken but I had a ton of hairline fractures of my femur all the way from my knee up and didn't know. They xrayed my back and had a cracked vertebrae but I didn't know there was anything wrong with my leg for like a week after when my knee and above was swelling up and it seemed fucked.
I fully tore the ligaments on the inside of my ankle, and had a fracture of one of those bones. Id never done an ankle before and it hurt a whole helluva lot less than either my shoulder or knee, so i thought it was just rolled. I continued working out, biking, and living life for 3 weeks. At 3 weeks the swelling had not gone down, and ROM hadnt improved, so i got an MRI and found out the truth.
If you dont know about it, you can probly just heal it yourself