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spine · Posterior Oblique 45 deg
Lumbar Spine Obliques (Scotty Dog)
Patient supine, rotated 45 deg.
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AI Patient · KV Sir
How to perform this view
- 01
Rotate patient 45 deg from supine (RPO/LPO).
- 02
Support with sponge; flex upper knee.
- 03
CR at L3, 5 cm medial to elevated ASIS.
- 04
Repeat other side.
Anatomical & patient position
Patient: Patient supine, rotated 45 deg.
Part: Side of interest down (RPO shows right zygapophyseal joints).
Central ray & centring point
Perpendicular at L3, 5 cm medial to up-side ASIS.
Exposure factors
kVp
80-90 kVp
mAs
30-40 mAs
SID
100 cm
IR size
24 x 30 cm
Grid
Yes
Respiration
Suspended
Clinical indications
- Pars interarticularis defect (spondylolysis)
- Facet joint disease
Contraindications & precautions
- Pregnancy (relative) - confirm LMP / 10-day rule, justify exposure and shield where possible
Structures shown & evaluation criteria
- 'Scotty dog' appearance
- Zygapophyseal joints open