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pelvis · AP Axial / Posterior Oblique
Sacroiliac Joints AP Axial & Oblique
Patient supine; for obliques rotate 25-30 deg with side of interest UP.
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AI Patient · KV Sir
How to perform this view
- 01
AP axial: supine, CR 30-35 deg cephalad, entering 5 cm below ASIS.
- 02
Obliques: rotate 25-30 deg, affected side elevated (LPO shows right SI).
- 03
Centre 2.5 cm medial to elevated ASIS.
- 04
Expose each side.
Anatomical & patient position
Patient: Patient supine; for obliques rotate 25-30 deg with side of interest UP.
Part: MSP centred for AP axial; elevate side of interest 25-30 deg for obliques.
Central ray & centring point
AP: 30-35 deg cephalad at 5 cm below ASIS; oblique: perpendicular 2.5 cm medial to upside ASIS.
Exposure factors
kVp
75-85 kVp
mAs
20-30 mAs
SID
100 cm
IR size
24 x 30 cm
Grid
Yes
Respiration
Suspended
Clinical indications
- Ankylosing spondylitis / sacroiliitis
- SI joint dislocation or subluxation
Contraindications & precautions
- Pregnancy (relative) - confirm LMP / 10-day rule, justify exposure and shield where possible
Structures shown & evaluation criteria
- Open SI joint space
- Sacrum and ilium