A couple of years ago I twisted my ankle badly and had to go for an X-ray, It turned out it was just a bad sprain and ligament damage, But the X-ray showed long ago when I was playing football I broke the bottom of my leg that holds the ankle bone, a piece of bone had snap off and went into the ankle joint,
The funny thing is the doctor said it's normal for sportsmen to break bones and not know it, many just heal by themselves and leave a scar on the bone or in my case a chip that fell off just floated around in the joint.
It's mad how you can break a bone and not know until years later, By the way, the bad sprain and ligament damage hurt so bad and took about 4 weeks to settle down