Where should the central ray be directed for a lateral tibia and fibula radiograph?

Where should the central ray be directed for a lateral tibia and fibula radiograph?

• A. Knee joint level
• B. Mid-shaft of the tibia/fibula
• C. Ankle joint
• D. Proximal tibia near knee

Answer: (B)

The central ray should be directed at the mid-shaft of the tibia and fibula. In a lateral view, centering the beam on the midline of the leg places the X-ray exposure along the long axis of both bones, producing a true lateral with proper superimposition and minimal distortion. This positioning also helps ensure the entire length of the tibia and fibula is included on the image. Directing the beam at the knee, ankle, or near the knee would risk clipping portions of the limb or misaligning the bones, making it harder to assess for fractures or alignment.

The central ray should be directed at the mid-shaft of the tibia and fibula. In a lateral view, centering the beam on the midline of the leg places the X-ray exposure along the long axis of both bones, producing a true lateral with proper superimposition and minimal distortion. This positioning also helps ensure the entire length of the tibia and fibula is included on the image.

Directing the beam at the knee, ankle, or near the knee would risk clipping portions of the limb or misaligning the bones, making it harder to assess for fractures or alignment.