Figure 7 (A–C): Facet injection in spondylolysis. The lateral radiograph (A) shows a break in the pars interarticularis (arrow). Oblique fluoroscopic spot image (B) shows a fl uoroscopy-guided L4–5 facet injection with filling of the inferior recess (arrowhead). Note the spondylolysis (arrow). A more delayed image (C) shows tracking of contrast from the facet joint into the spondylolytic site (arrow). Note the emptying of contrast from the joint space.