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lower limb · AP / Lateral
Knee AP & Lateral
Supine (AP); lateral recumbent (lateral).
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AI Patient · KV Sir
How to perform this view
- 01
AP: rotate leg slightly internally, CR 0-5 deg depending on ASIS-table distance.
- 02
Centre 1.25 cm distal to apex of patella.
- 03
Lateral: roll onto affected side, flex knee 20-30 deg.
- 04
CR 5-7 deg cephalad to 2.5 cm distal to medial epicondyle.
Anatomical & patient position
Patient: Supine (AP); lateral recumbent (lateral).
Part: AP: leg internally rotated 3-5 deg. Lateral: knee flexed 20-30 deg.
Central ray & centring point
AP: 1.25 cm below patella apex; lateral 5-7 deg cephalad.
Exposure factors
kVp
65-75 kVp
mAs
4-6 mAs
SID
100 cm
IR size
24 x 30 cm
Grid
Yes if >10 cm
Respiration
N/A
Clinical indications
- Knee fractures
- Osteoarthritis
- Effusion, lipohaemarthrosis
Contraindications & precautions
- Gross deformity / open fracture - do not manipulate; adapt projection and use horizontal beam - flex knee no more than 10 deg if patellar fracture suspected
Structures shown & evaluation criteria
- Distal femur, proximal tibia & fibula, patella
- Open femorotibial joint
- Femoral condyles superimposed (lateral)