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lower limb · Tangential
Patella Skyline (Sunrise / Merchant)
Seated or supine with knees flexed 40-45 deg (Merchant) or prone (Settegast).
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AI Patient · KV Sir
How to perform this view
- 01
Merchant: supine, knees over leg holder flexed 40 deg.
- 02
IR rests on shins, perpendicular to CR.
- 03
CR 30 deg caudad from horizontal through patellofemoral joint.
- 04
Bilateral for comparison.
Anatomical & patient position
Patient: Seated or supine with knees flexed 40-45 deg (Merchant) or prone (Settegast).
Part: Knee flexion 40-45 deg; IR held perpendicular to beam.
Central ray & centring point
30 deg from horizontal, tangential to patellofemoral joint.
Exposure factors
kVp
60-70 kVp
mAs
4-6 mAs
SID
120-180 cm
IR size
24 x 30 cm landscape
Grid
No
Respiration
N/A
Clinical indications
- Patellar subluxation / dislocation
- Vertical patellar fracture
- Patellofemoral OA
Contraindications & precautions
- Suspected transverse patellar fracture - exclude on lateral first before flexing
Structures shown & evaluation criteria
- Patella in profile, patellofemoral joint space