The geometry of the facet joint has been the focus of seve rai studies. The orientation of the facet joint was studied uslng CT scan in patients with lumbar disc herniation. There were 20 patients with protruded and 20 paiients with extruded disc herniation. The diagnosis was confirmed at surgery in ali cases. The facet joint angie was measured according to Grobler's method. Our results revealed an increased facet joint angie in patients with protruded (p<0.05) and those with extruded (p<0.01) disc herniation, when compared with the controi group. The side of increased facet angie was the side of herniated disc İn ail cases. These resuits support the possible role of the facet joint on the pathogenesis of disc herniations.
Keywords: Facet Joint Angie, Lumbar Dİsc Herniation.