Objective To study the etiological effect between the spatial variation of lumbar facet orientation and the degenerative lumbar spondylolisthesis(DLS)in axial,sagittal and coronal plane.Methods 85 patients with DLS at L4 and 110 controlsreceived X-ray and CT scanning.The facet angle at L4-L5 was measured in axial,sagittal and coronal plane.Results Compared with the control group, the DLS-angles were lesser and the difference between the left and right was greater in axial,coronal plane(P <0.05).But were greater in sagittal plane(P <0.05).Conclusion The DLS-angles are more sagittal in axial plane,more level in sagittal plane and more erect in coronal plane.The change of spatial orientation in the facet joint is one of etiological factors of degenerative lumbar spondylolisthesis.
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