The schematic drawings showing intraosseous venography patterns during percutaneous vertebroplasy in patients with osteoporotic compression fracture. Venogram patterns consist of trabecular type (A),trabecular-anterior type (B), trabecular-posterior type (C), trabecularanteriorposterior type (D), trabecular-lateral type (E), soft tissue type (F),venous-anterior type (G), venous-posterior type (H) and venous-anteriorposterior type (I). See Fig. 1 in page 289 for further explanation.