In the manual therapy video below, NAIOMT's Bill Temes demonstrates subtalar ligament testing.
It is often thought that lower extremity problems are just that...localized lower extremity problems. Well, usually they aren't. Most lower extremity problems, whether traumatic, or insidious onset, are stress reactions of some sort. Tissues are able to adapt to increased stress for a time, but eventually they begin to break down, and they break down in fairly predictable patterns.