at least that what this site claims:
http://www.triggerpointbook.com/
Seriously, do you know about this? It's called
Trigger Point Therapy, and the basic idea is "referred pain"; "it's a mistake to assume that the problem is at the place that hurts." You massage trigger points to relieve pain elsewhere in the body--I guess like reflexology.
Health care providers have been using it, but Amazon said this book became an instant classic because it explains how to do self-massage. There's also a bunch of implements you can buy to do this on yourself:
http://www.tptherapy.com/ (I've got my eye on the juicily named
quadballer myself).
ETA: okay, so trigger points are muscle knots, which is why this is different from accupressure (cause accupressure manipulates the flow of energy, and the trigger points are physical). AND . . . it was invented, more or less by the first female personal physician to a president, JFK--Dr. Janet Travell. I think that's kinda interesting.