AP Oblique SI Joints (RPO/LPO)

Patient/part position for the AP Oblique SI Joints:

• supine

• body 25-30 degree posterior oblique position

• support body in position

• long axis parallel with table

• IR centered at level of ASIS

Where is the central ray placed for the AP Oblique SI Joints?

• perpendicular to IR

• enters patient 1” medial to elevated ASIS

What is the collimation size the AP Oblique SI Joints?

6 × 10 inches or 6 × 12 inches

What are the structures shown for the AP Oblique SI Joints?

the sacroiliac joint farthest from the IR

What is the Evaluation Criteria for the AP Oblique SI Joints?

• open sacroiliac joint space with minimal overlapping of the ilium and sacrum

• joint centered on the radiograph

Breathing technique for the for the AP Oblique SI Joints:

suspend