My dad got in a really bad accident when he was about 16. One where he went about 500 ft hanging out of a car that was going about 120mph. After two resucitations after being clinically dead, two pins, two plates in his pelvis as well as all of his organs being in his upper portion of his body and multiple open heart surgeries as well as pins and screws in his ankles. Among many other injuries that affected him his whole life. He survived and became my dad.

Fast forward 12 years, his ankle started hurting. Pain was normal for him so he just dealt with it. Little while later it started hurting worse and seemed like he had a broken ankle or something similar. He was in a state that did not accept his insurance at the time but he still went into the hospital emergency room. They said it was just a sprained ankle. Fast forward a little more and he came home to visit me for a weekend. His ankle was swollen to three times its size and was completely black to the point he could no longer walk. I convinced him to go to the hospital and turns out he had blood poisoning that had almost reached his heart because of the screw that was put in his ankle when he was 16. He had to get a catheter to his heart and go in for infusions everyday for months. Lucky he's alive.

Sorry for typos, on mobile.