I had that for years. Riding actually helped mine and when I have not been riding for some months ,it tends to come back. However I ride in freeswinging stirrups with my feet under me, this helps stretch my tendons and ligaments. They said I have really tight ligaments. Also I used to run track and everywhere. That makes some overdeveloped muscles that may actually pull on the heel.. or something to that effect.
I also got one of those cast things to sleep in, HaH! Hard enough for me to sleep without that annoying thing. I used it instead while sitting for some length. The stretches help ,I use them when I feel everyting tighting up.
It was more likely to happen to me when I sit too long.Like when sewing, or on the computer. Or driving for long periods.
I told my othopedist it got better after I starting riding 3X a week. He said they just told him at a conference that that seemed to help some people.
I also got a metarsial support pad. I HAVE to wear really good , supportive shoes, I buy heavy special insoles to put in all my shoes. And I can't go barefoot (this may have to do more with the collapsed arche problem too.)
I also have collapsed arches, so that aggrevates everything.
Good luck, especially with that leg cast thing!
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