Indications of MR arthrography
What is MR arthrography, and what are its indications?
Direct MR arthrography involves the injection of dilute gadolinium-based contrast material into a joint under fluoroscopic guidance followed by MR imaging. This technique is commonly employed in the shoulder and hip to evaluate the labrum and articular cartilage ( Figure 75-1 ). Wrist arthrography is used to evaluate the intrinsic carpal ligaments and the triangular fibrocartilage complex (TFCC). Intraarticular administration of contrast material allows for improved contrast resolution as well as distention of the joint capsule, both of which make it easier to visualize and evaluate small intraarticular structures (e.g., the labroligamentous complex of the shoulder joint).