MR arthrography (arthrogram) is a contrast-enhanced study used to visualize the interior of joints in a very detailed way. An arthrogram helps doctors diagnose problems with the bones, cartilage, ligaments, and tendons within a joint. Arthrograms are especially useful for determining the cause of unexplained joint pain. Contrast material (gadolinium based) is injected directly into the joint which distends or enlarges the joint thus allowing for enhanced visualization of small internal structures. This leads to improved evaluation of diseases or conditions within the joint. Joint injections are done immediately before the MRI exam using fluoroscopic guidance.