I have heavy calcification in one of my heels. It's there because I have always had foot issues, not the least of which is a Haglund's Deformity. Stiff feet, years of soccer, and that little bit of extra bone means that my achilles is now pretty thickened, stiff and sore much of the time. So I went to a physiatrist to get it sorted out. I'm way too young to stop moving! She prescribed custom orthotics to limit the movement in the foot and the amount of friction from the Haglund's Deformity on the achilles tendon.
The orthotics feel GREAT on my feet, but they've created a new issue. As my body adjusts to the support on my feet, my psoas muscle is tight, tight, tight. So I thought this article was quite timely.
Releasing Tension in the Psoas