Fig. 1From: A morphological characterization of the lumbar neural arch in females and males with degenerative spondylolisthesisNeural arch measurements. I) Transverse facet angle (TFA) = the angle between line A and line C, Transverse inter-facet angle (TIFA) = the angle between line A and line B; II) The vertebral canal length (VCL) = the distance between A and B, the vertebral canal width (VCW) = the distance between C and D; III) Facet width (FW) = the distance between A and C, Superior inter-facet width (SIFW) = the distance between A and B, Inferior inter-facet widths (IIFW) = the distance between C and D; IV) The pedicle length (PL) = the distance between A and B, The pedicle width (PW) = the distance between C and D; V) The vertebral foramen height (VFH) = the distance between A and B, The pedicle height (PH) = the distance between C and DBack to article page