From Steadman's medical dictionary:
luxation = dislocation
subluxation = "an incomplete luxation or dislocation; though a relationship is altered, contact between joint surfaces remains."
In my case it was easy to imagine moving the sliding surfaces of the facet far enough so that they caught on each other, putting intense pressure on a very small surface. Hold your hands together in front of your body like you are praying and press them together. They are like the sliding surfaces of the facets. Then move them so they are incongruent... the little finger on one hand moves towards, then past the thumb on the other... when you go too far, the joint surfaces are dislocated.... putting them back together will put intense pressure on a very small surface.
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