Which projection uses a central ray that is midway between the malleoli?

Which projection uses a central ray that is midway between the malleoli?

• A. AP mortise ankle
• B. Lateral ankle
• C. AP ankle
• D. Medial oblique ankle

Answer: (C)

Centering the X-ray beam midway between the malleoli for an AP ankle places the beam through the ankle joint and distal tibia/fibula, giving a true AP image where the ankle mortise area and joint space are clearly demonstrated. This alignment helps evaluate fractures and joint integrity without distortion, which is why this projection uses a central ray located between the malleoli. The other views adjust the foot or leg position (rotation or lateral/posterior angles) to open or profile different parts of the ankle, rather than mandating a midway centering between the malleoli.

Centering the X-ray beam midway between the malleoli for an AP ankle places the beam through the ankle joint and distal tibia/fibula, giving a true AP image where the ankle mortise area and joint space are clearly demonstrated. This alignment helps evaluate fractures and joint integrity without distortion, which is why this projection uses a central ray located between the malleoli. The other views adjust the foot or leg position (rotation or lateral/posterior angles) to open or profile different parts of the ankle, rather than mandating a midway centering between the malleoli.