The statistical distribution of members of a population around the population mean. In a gaussian distribution, 68.2% of values fall within Â± 1 standard deviation (SD); 95.4% fall within Â± 2 SD of the mean; and 99.7% fall within Â± 3 SD of the mean. Synonym(s): bell-shaped curve, normal distribution.
Located on the bony extensions of the vertebrae, the surfaces of the facet joints fit together like a three-dimensional puzzle. In the spaces between vertebrae run the nerve rootsâexits off the spinal cord's information highway.
The facet joints glide and allow the spine to move freely with support. Facet arthrosis is degeneration or wear and tear of the facet joints. Severe facet arthrosis would be advanced degeneration, possibly with arthritis or bone spurs. This might cause pain, and/or cause stiffening of the spine, and/or even put pressure on the spinal nerves or thecal sac (which contains the spinal cord). I've put more information in the links below.