Oh! That IS interesting! I'm going to check into that, but that does sound familiar! Maybe its mostly my activity that I have to step up.
I'd been walking ALOT - like competitively all last year - as all of my office got Fitbits and my husband got one. It was nothing for me to take a 5 or 6+ mile walk. Getting 12-15k steps a day.
THEN - I fractured my ankle in Puerto Rico over Christmas the day before we were getting on a cruise. UGH. Of course I didn't know at the time it was fractured - I thought surely its just a bad (really, really bad, awful) sprain. I dealt with it the whole week on the cruise ship by eating lots of ibuprophen, icing ALOT and just going about my business! But it hurt.
Got it checked out when we got back and yup...fractured. And now...6 months later its not healed properly and the ortho told me it may/probably will not. Awesome.