What should face upward during the lateral elbow positioning?

In lateral elbow positioning, the thumb should face upward. This positioning is crucial for ensuring that the anatomy of the elbow is correctly aligned and visualized in the x-ray. When the thumb is positioned upward, it helps to place the radius and ulna in a true lateral position, which minimizes superimposition of the bones and allows for a clearer view of the joint surfaces and other anatomical structures. Proper positioning also aids in reducing patient discomfort by keeping the shoulder and wrist in alignment, promoting a more natural position of the upper limb.

Being mindful of this orientation is particularly important in diagnostic imaging, as it ensures that the images obtained are accurate and useful for assessment and diagnosis by healthcare professionals. It plays a significant role in identifying fractures, dislocations, or other pathologies of the elbow joint effectively.