facet asymmetry

facet asymmetry,

n condition in which the facet joints of vertebrae are not oriented properly, thereby affecting the mobility of the spine.
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Standard value measurements greater than 6[degrees] indicates facet asymmetry and is referred as facet tropism.
The most recent literature about the effects of facet tropism on spondylolysis, lumbar discopathy, and lumbar degenerative disease has demonstrated that the FJA and facet joint coronal positioning increases at lower levels, the rate of facet asymmetry is higher at the levels with pars defect, and facet tropism is most commonly seen at L5-S1 than L4-5 level.