In the spine, the parts of the vertebrae that touch are the facets. If you look at the vertebrae one-on-top-of-the-other, they are separated by the discs, so the bones do not touch. But behind the vertebrae, at each spinal level, are projections from the main, roundish, vertebral body, somewhat like little bony “feet,” and these parts, the facets, DO touch each other, on both the left and right sides of the spine. If the facets get jammed, or compressed, the surrounding soft tissue---muscles, etc., gets affected, tight, somewhat like a clinched fist. This is painful, and needs precise, directional release. I find facet compression frequently in patients with back pain, and am able to successfully release it with my Activator Chiropractic Method.