By how many degrees should the foot be rotated to properly demonstrate the ankle mortise?

To properly demonstrate the ankle mortise on an imaging study, the foot should be rotated 15-20 degrees internally. This degree of rotation is crucial because it positions the tibia and fibula in such a way that the mortise joint can be clearly visualized. The ankle mortise is formed by the lateral and medial malleoli of the tibia and fibula, and the appropriate rotation helps to open up the joint space, allowing for better assessment of any potential injuries or abnormalities. Selecting this range provides optimal viewing angles for radiologists and helps ensure accurate interpretations of the ankle's anatomy.