Studies show that magnetic resonance arthrography (MRA) does add to what an MRI (magnetic resonance imaging) can show.

With MRA, a contrast dye is injected into the joint. Since there's already some synovial fluid in the joint, the added fluid pushes against the joint capsule.

The colored fluid then moves into every nook and cranny of the joint. It outlines the structures and leaks into any areas of damage. MRA can show any changes in the normal structure of the shoulder. It shows tears in the capsule, cartilage, ligaments, and tendons.

If you're thinking about having shoulder surgery, the MRA will help the surgeon plan the best surgical method for the problem.