An internal oblique of the foot is performed with the plantar surface of the foot forming a ___ degree angle to the surface of the IR.

When performing an internal oblique view of the foot, the plantar surface is positioned at a specific angle to ensure that the structures of interest, such as the cuboid and navicular bones, are properly visualized. An internal oblique of the foot requires the plantar surface to form a 30-degree angle with the image receptor (IR).

This positioning helps to achieve optimal separation and display of the metatarsals, and it minimizes superimposition of these bones. The 30-degree angle is commonly utilized in radiographic practice to best demonstrate the anatomy in the foot without distortion, ensuring that any potential pathologies or injuries can be clearly assessed.