Capitol Imaging Services is a freestanding independent outpatient imaging provider that performs a specialty procedure called an arthrogram at select affiliate centers.

An arthrogram uses imaging equipment to evaluate a joint like the shoulder, elbow, wrist, hip, knee or ankle. It is a two-step procedure consisting of a contrast injection into the joint, followed by an MRI or CT scan of the joint.

An arthrogram is often recommended by a physician in order to best:

  • Find tears, degeneration or disease in the cartilage, ligament or tendon
  • Detect growths or synovial cysts in the joint
  • Diagnose unexplained joint pain
  • Determine the need for treatment, including arthroscopy, surgery or joint replacement

Step one: the injection
The first part of an arthrogram uses fluoroscopy – a specialized type of x-ray equipment that images the area in real time, and displays it on a video monitor. A small needle will be placed in the joint and contrast material (i.e. x-ray dye) will be injected into the joint space. Several x-ray images will be taken using the fluoroscopy machine. Pain medications like anesthetic and/or steroids may also be injected, depending on what was ordered by the healthcare provider. The injection portion typically takes about 30 minutes.

Step two: the scan
In most cases, an MRI (or occasionally a CT scan) of the joint will be performed after the injection portion. CT can be used to better evaluate the intra-articular structures in patients who cannot have an MRI for safety reasons. The MRI usually takes another 30-45 minutes.

Some people may wonder why not have just the scan and skip the injection. There are a number of reasons to do both.

An MRI arthrogram can be used to further evaluate an abnormality identified on a routine MRI. MRI arthrogram can better define some issues following surgery than a routine MRI. Distention of the joint from the injected contrast material can better highlight some small structures that are close together on a routine MRI. Determining if an injury extends outside the joint can be easier with MRI arthrogram in some cases.

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