Question

Which of the following projections require that the shoulder be placed in internal rotation?

1. AP humerus
2. Lateral forearm
3. Lateral humerus

Answer 1

The lateral humerus is the projection that requires the shoulder to be placed in internal rotation. Internal rotation aligns the humerus correctly for this view, distinguishing it from the neutral or external rotation required in an AP humerus projection.

Step-by-step explanation:

The projection that requires the shoulder to be placed in internal rotation is the lateral humerus. Internal rotation of the shoulder is performed to properly position the humerus in this lateral view. It entails rotating the anterior surface of the arm towards the midline of the body, as the shoulder is a multiaxial joint capable of this movement. In contrast, an AP humerus projection would typically require neutral or slight external rotation, while a lateral forearm projection does not involve rotation of the shoulder, as the focus is on the forearm bones and the shoulder remains untouched in normal forearm positioning.