Which projection of the ankle best demonstrates the open joint space of the lateral aspect?

The AP mortise projection is designed to provide a clear view of the joint spaces around the ankle, particularly the lateral aspect of the joint. This projection involves positioning the foot in a way that the ankle is in a neutral position, which allows the medial and lateral malleoli to be parallel to the imaging receptor. By doing this, the AP mortise projection effectively opens up the joint space at the ankle, allowing for better visualization of any potential injuries, fractures, or pathological conditions in that area.

The unique positioning of the foot in this projection enhances clarity, making the mortise joint an optimal choice when assessing the relationship between the talus and the surrounding bones of the ankle joint. This contrasts with other projections, which may not align the joint spaces in a way that optimally demonstrates their openness or may obscure relevant anatomical details necessary for accurate diagnosis.