For an AP oblique projection of the ankle mortise joint, how much should the ankle be rotated medially?

In an AP oblique projection of the ankle mortise joint, a medial rotation of the ankle by 15 to 20 degrees is optimal for clearly visualizing the joint structure. This angle of rotation allows the mortise joint, which is formed by the tibia and fibula with the talus, to be best demonstrated without superimposition from other surrounding bony structures. Proper positioning is essential for obtaining high-quality images that aid in accurate diagnosis.

Using a rotation of 15 to 20 degrees ensures that the medial and lateral malleoli are adequately visualized, allowing for assessment of any potential abnormalities or injuries in that area. The specified angle strikes a balance, providing a clear view of the joint while minimizing distortion and maximizing detail in the imaging.