A Radiograph of a PA Axial Projection for the Intercondylar

question 72

Multiple Choice

A radiograph of a PA axial projection for the intercondylar fossa does not demonstrate the fossa well.It is foreshortened.The following positioning factors were used: patient prone,knee flexed 40° to 45°,CR angled to be perpendicular to the femur,40-inch SID,and no rotation of the lower limb.On the basis of the factors used,what changes need to be made to produce a more diagnostic image?

• A) Increase SID to at least 48 inches (123 cm).
• B) CR must be perpendicular to lower leg.
• C) Rotate lower extremity 10° medially.
• D) Reduce flexion of the knee to 20° to 30°.

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