When might an arthrogram be indicated, and what does it involve?

• A. Evaluate joint pathology; injection of contrast into the joint with imaging (MRI or CT) to assess ligaments/tendons.
• B. Evaluate brain function; injection of contrast into the joint with imaging.
• C. Evaluate the heart function; injection into the coronary arteries.
• D. Evaluate kidney function; injection into the ureters.

Answer: (A)

An arthrogram is used when there’s a suspicion of intra-articular pathology that isn’t clearly defined on standard imaging. The procedure involves injecting contrast directly into the joint space and then performing imaging (MRI or CT). The contrast outlines the joint capsule and internal structures, making ligaments, tendons, cartilage, and the labrum easier to see for tears or defects. MRI arthrography uses gadolinium contrast, while CT arthrography uses iodinated contrast. This approach is specifically about evaluating the joint itself and its internal structures, not about imaging distant organs like the brain, heart, or kidneys.