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Saturday 8 December 2012

Sacroiliac Joints Study


AP Projection

  1. Patient in supine position;
  2. Lower limbs in extension.

Central ray angled 30-35º cephalad to the middle between Anterior Superior Iliac Spine (ASIS) and pubic symphysis.
Respiration: Suspended.


Evaluation Criteria:
  • Lower spine in the center of the image and centered with the sacrum;
  • Good visualization of the sacroiliac joints and L5;
  • Appropriate exposure values (visualization of the all bony trabeculation and soft tissue).

AP Oblique Projection

  1. Patient start in prone supine position;
  2. Elevation from the affected side 25-30º
                              - LPO to demonstrate the right joint;
                              - RPO to demonstrate the left joint.


Central ray perpendicular to the middle between Anterior Superior Iliac Spine (ASIS) and pubic symphysis, of the affected side.
Respiration: Suspended.


Evaluation Criteria:
  • Sacroiliac joint open and in the center of the image;
  • Iliac crest almost in profile position;
  • Appropriate exposure values (visualization of the all bony trabeculation and soft tissue).



RPO- Left joint

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