Why, indeed. Having seen every podiatrist from San Antonio to Lafayette, and after three surgeries, there is a consensus that I'm a medical mystery.
Among other things, I have nerve damage in my feet, some of which is partially due to mutant veins that choked them out. Don't know the other reasons. Nerve problems are the trickiest things for medical folks to diagnose, they're the one thing they can't "see."
And there's a structural thing or two in the ankles that's a separate thing. They can see what happened, but no explanation why, and it doesn't matter anyway. There's nothing to do to fix it.
That's the part that stops me from running, moving athletically, etc. Ankles don't move like they're supposed to anymore. But by far the most life-altering thing is the nerves in the heels. That's why I can't stand up but for a minute or two at a time at the most. You can't imagine how life-altering and limiting that is. But, I've become pretty adept at thinking ahead and planning activities such that I can do enough to where a lot of people never even notice unless I tell them there's a problem. I will occasionally take on little DIY projects around the house, do yard work, and I function reasonably well at work (at a mostly desk job). I'll usually pay for working around the house with an unpleasant ramp-up in pain for the next day or two, so I don't do it much. But I can do it. There's just a lot of things I can't/don't do.