Ouch! I'm assuming you've seen a podiatrist or two? What exactly did they say it was? I can't help you much but I will say I've noticed amongst the podiatrists in my city there's a huge range of podiatrists and some are not as good as others. I have known some podiatrists to make incorrect orthodics and I'd never go back.

The best in my city seem to be at a sports medicine clinic which is also employed to treat whole high profile football teams. Makes sense since if they stuff up they loose more than just one customer and their immediate family but a lucrative contract and a lot more customers.

Maybe get a few second opinions from various podiatrists if you are worried. Perhaps some of them might even be able to refer you to others who've had similar surgery who can talk about their experiences with you?