Question

A lateral projection of the tibia and fibula is to be obtained, but due to the patient's condition, the exam is performed on the stretcher with the IR flat. The leg can only be rotated externally 45 degrees. In order to obtain a lateral projection, with the leg rotated externally 45 degrees, where should the CR be directed?

Answer 1

To obtain a lateral projection of the tibia and fibula with external rotation, the CR should be directed to the point halfway between the medial malleolus and the knee joint.

Step-by-step explanation:

In order to obtain a lateral projection of the tibia and fibula with the leg rotated externally 45 degrees, the central ray (CR) should be directed perpendicular to the tibia at the midshaft level. This means that the CR should be directed to the point halfway between the medial malleolus (inner ankle bone) and the knee joint. The patient's leg should be rotated externally 45 degrees, and the image receptor (IR) should be placed directly under the leg on the stretcher.