An ankle injury is non-lifethreatening. I spent 6 years in high school and college working with sports injuries. They would want to X-ray an ankle injury to determine if there is a fracture or ligament damage. Sometimes a severe strain an be worse than a break, but if it is something they need to set, they would want to X-ray and do that right away before there is too much swelling. If she chooses not to have the X-ray, they could still stabilize the ankle and she could opt out of any challenges--with this F6, she will not be voted out for doing that. From personal experience, I know that you can recover from a broken ankle that is not x-rayed or set, but that it can lead to problems later on. But, for $1 Million, I'd take that risk again. With the knee you usually don't need to x-ray because you are dealing with soft tissue--cartilage and ligaments. You usually MRI knees. Medical did not pull James when he had his knee problem. He stayed until he asked to be voted out. A broken tibia would be highly painful, so she would most likely seek medical attention. IF there is a crack or a hairline fracture in a bone, it usually doesn't present immediately. There is usually pain that does not resolve with ice and heat therapy.