When the legs are flexed 30 degrees for the tangential knee projection (Merchant method), the central ray should be angled
A) 75 degrees.
B) 45 degrees.
C) 60 degrees.
D) perpendicular to the lower leg.

Question

Quizplus · Accepted Answer

The central ray should be angled 75 degrees to the lower leg when the legs are flexed 30 degrees for the tangential knee projection (Merchant method). This is because the central ray must be perpendicular to the plane of the joint in order to produce a tangential view of the knee.

When the Legs Are Flexed 30 Degrees for the Tangential