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lower limb · AP / Mortise (15 deg) / Lateral
Ankle AP, Mortise & Lateral
Supine, leg extended.
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AI Patient · KV Sir
How to perform this view
- 01
Supine; dorsiflex ankle so plantar surface is vertical.
- 02
AP: CR midway between malleoli.
- 03
Mortise: rotate leg 15-20 deg medially.
- 04
Lateral: patient on affected side, CR to medial malleolus.
Anatomical & patient position
Patient: Supine, leg extended.
Part: AP: foot dorsiflexed, vertical. Mortise: leg internally rotated 15-20 deg until malleoli parallel to IR.
Central ray & centring point
Perpendicular, midway between malleoli.
Exposure factors
kVp
60-70 kVp
mAs
3-5 mAs
SID
100 cm
IR size
24 x 30 cm (split)
Grid
No
Respiration
N/A
Clinical indications
- Ankle sprain (Ottawa rules)
- Malleolar fractures (Weber)
- Syndesmosis injury
Contraindications & precautions
- Gross deformity / open fracture - do not manipulate; adapt projection and use horizontal beam
Structures shown & evaluation criteria
- Distal tibia, fibula, talus
- Open mortise joint (equal space)
- Base of 5th metatarsal on lateral