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Abstract Objective To explore the role of facet joint angle(FJA)and facet tropism(FT)in degenerative lumbar spondylolisthesis(DLS).Methods In group DLS，50 patients were enrolled in our hospital from January 2016 to December 2017.There were18 male and 32 women，with an average age of(63.94±9.96)years.Control group had 50 patients from our inpatient ward or outpatient department.Lumbar CT showed no obvious abnormalities and only lumbar degenerative changes.There were a total of 50 patients，22 men and 28 women，with an average age of(62.05±11.42)years.In the DLS group，FJA of each patient at L3～4，L4～5and L5S1 was measured on CT.The independent sample t test was used to compare the difference of FJA between the DLS group and the normal group.Pfirrmann grading of intervertebral disc degeneration between the DLS and control groups were compared with the Mann-Whitney U test.Results The results of the Mann-Whitney U test demonstrated no significant difference in Pfirrmann grading at the L3～4，L4～5，and L5S1 levels between the DLS and control groups(p = 0.641，0.953，and 0.795，respectively).The DLS group was compared with the normal group，and there was a statistical difference between the two groups in the L4～5(P＜0.001).There were statistical differences between the two groups in the L3～4(P＝0.002).There was no statistical difference between the two groups in the L5S1(P＝0.903).Conclusion FT is a risk factor for the occurrence of DLS.DLS patients have more sagittal FJA than normal people.We tend to think that this is the result of the second reconstitution of FJ in the occurrence of DLS.
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