Which structure is demonstrated as the capitulum in elbow imaging?

Which structure is demonstrated as the capitulum in elbow imaging?

• A. Medial epicondyle
• B. Lateral epicondyle
• C. Humerus
• D. Ulna

Answer: (C)

The correct answer is the humerus. In elbow imaging, the capitulum is a prominent structure located on the lateral aspect of the distal humerus. It is one of the articular surfaces that forms part of the elbow joint, specifically, it articulates with the head of the radius.

Understanding the placement and significance of the capitulum is crucial for interpreting elbow images accurately. It plays a key role in the function of the elbow, allowing for smooth movement and articulation during flexion and extension of the forearm.

In contrast, the medial and lateral epicondyles are bony projections located on either side of the humerus but do not directly relate to the capitulum, while the ulna is an adjacent bone that forms part of the elbow joint but does not make up the capitulum itself. Knowing the anatomical relationships and the specific features of the humerus is important for examining and diagnosing elbow conditions in radiographic imaging.