What CR angulation is recommended for an AP projection of the knee on a patient with an ASIS-to-tabletop measurement of 18 cm?

Question

Quizplus · Accepted Answer

A 3° to 5° caudad angle should be used for an AP projection of the knee on a patient with an ASIS-to-tabletop measurement of 18 cm. This slight angle helps to project the patella away from the condyles and improve image quality. A perpendicular CR or a cephalad angle would not be optimal for this patient's anatomy. A 10° to 15° cephalad angle is generally used for an AP axial projection of the knee.

What CR Angulation Is Recommended for an AP Projection of the Knee