Ankle AP X-Ray Positioning Guide for Radiography
Ankle AP X-ray positioning is a core lower-extremity radiography topic. This page covers the patient position, central ray, anatomy demonstrated, and image evaluation criteria in a concise educational format.
| Region | Tarsal bone, ankle joint |
|---|---|
| Pathology | Fracture of tarsal bone, tibia and fibula, ligament injury, and ankle joint dislocation |
| IR size | 24 × 30 cm (10 × 12 inch) |
| SID | 100 cm (40 inches) |
| Central ray | Perpendicular beam directed at the midpoint between the medial and lateral malleolus |
| Respiration | Unrelated |
Patient positioning for ankle AP
Position the patient supine or seated with the leg naturally extended. Center the ankle joint to the receptor and dorsiflex the foot so it is perpendicular to the receptor for a true AP ankle image.
Anatomy demonstrated and image evaluation
The ankle AP projection should show the distal tibia, distal fibula, talus, and ankle joint. The talotibial joint should be identifiable, with appropriate overlap between the distal fibula and tibia.
Practical radiography tips
Confirm dorsiflexion, center accurately between the malleoli, and review rotation before exposure. Small positioning adjustments can noticeably improve ankle joint visualization.
Frequently asked questions
What does an ankle AP X-ray show?
An ankle AP X-ray demonstrates the distal tibia, distal fibula, talus, and the ankle joint for trauma or alignment assessment.
Where is the central ray for ankle AP?
The central ray is directed perpendicular to the midpoint between the medial malleolus and lateral malleolus.