Exams
Spine

SI Joints

2 default · 0 custom

Quick technique

kVp
75–85
mAs
25–40
SID
40 in
Grid
Yes
Detector
24x30 cm.
Breath
Suspend on expiration.

Views

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IMAGE RECEPTOR
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Placeholder
Patient position
Supine.
Part position
MSP centered for AP; affected side elevated 25–30° for obliques (LPO = right SI joint).
Central ray
AP: 30° cephalic to 1.5 in superior to symphysis. Oblique: perpendicular to 1 in medial to elevated ASIS.
IR placement
24x30 cm.

TechniqueDefault

kVp
75–85
mAs
25–40
SID
40 in
Grid
Yes
Breath
Suspend on expiration.
Detector
24x30 cm.

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Anatomy coverage

Both SI joints (AP); single SI joint open (oblique).

Tech pearls

  • Mnemonic: 'side UP' shows that SI joint on oblique.
  • Ankylosing spondylitis classically begins at SI joints.

Image evaluation

  • AP axial: SI joints open, symphysis at bottom of image
  • Oblique: elevated-side SI joint open

Common mistakes

  • Wrong oblique direction labeled
  • Insufficient angle/rotation
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Anatomy overview

SacrumIliumSI joint space
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Protocol controls

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