I've had plantar fasciitis, and had to wear padding and tape on my feet for that, but I learned to relieve it by stretching out my Achilles' tendons while I was still in bed, by bending my feet and holding them up. Earth shoes would do the same thing, only all the time you wear them. Maybe they aggravate a back or hip problem, but I think they would only be helpful for plantar fasciitis.

I hope you don't have to buy all new shoes. I used to love my Earth shoes. Now, they are too narrow for me.