Correlation between sagittal and inclined angles of cervical facet joints and cervical disc herniation: a radiological observational study.

control group) as the main independent variable, after adjusting for confounding factors, the average inclined angles at the C5/6 and C6/7 segments in the CDH group were significantly lower than those in the control group (adjusted P = 0.000 and 0.000, with adjusted β = −3.780° and −4.580°, respectively); the C4/5 segment did not reach statistical significance after correction (adjusted P = 0.063, adjusted β = −2.006°). 4 Discussion The facet joints of the spine are bony contacts between two vertebral bodies that guide the relative motion of one vertebral body over the other (mobility), while also providing torsional stiffness and resistance to shear (stability) ( 18 ).

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Although the differences at the C5/6 and C6/7 segments showed an increasing trend, no statistically significant differences were observed after correction (adjusted P = 0.084 and 0.138, respectively), and both had small effect sizes ( r = 0.15 and 0.14, with 95% CIs of 0.01–0.29 and 0.00–0.28, respectively).

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