In which position should the foot be for an anteroposterior (AP) projection of the ankle?

For an anteroposterior (AP) projection of the ankle, the foot should be positioned in dorsiflexion. This position involves lifting the toes upwards towards the shin, which ensures that the ankle joint is well visualized and properly aligned for imaging. Dorsiflexion opens up the joint space and improves the clarity of the structures being examined, such as the tibia, fibula, and talus, allowing for more accurate assessment of any injuries or conditions affecting the ankle.

Choosing this position also minimizes superimposition of surrounding tissues and is critical for obtaining high-quality radiographs. The other positions do not provide the same clarity and alignment needed for the AP projection. For example, plantar flexion, which points the toes downward, would obscure important anatomical details, while a neutral position might not adequately display the joint space. Inverting the foot also alters the natural alignment and would not be suitable for an accurate AP view.