CT Arthrography of the Shoulder Uses Iodinated Contrast
Yes, CT arthrography of the shoulder is performed with iodinated contrast material injected directly into the glenohumeral joint.
How CT Arthrography Works
CT arthrography involves the intra-articular injection of iodinated contrast material into the shoulder joint under fluoroscopic guidance, followed by CT imaging 1. This is fundamentally different from intravenous contrast CT, which is not used for shoulder arthrography.
Technical Details
The procedure uses:
- Diluted iodinated contrast (typically 80-300 mg/ml concentration) injected directly into the joint space 2, 3, 4
- Fluoroscopic confirmation of proper needle placement before contrast injection 5
- The iodinated contrast distends the joint and outlines intra-articular structures like the labrum, cartilage, and rotator cuff tendons
Clinical Applications
According to the 2025 ACR Appropriateness Criteria, CT arthrography:
- Provides comparable sensitivity and possibly improved specificity for detecting labral lesions compared to MR arthrography 1
- Offers superior visualization of osseous abnormalities such as glenoid rim fractures 1
- Is inferior to MR arthrography for assessing partial-thickness rotator cuff tears 1
Important Distinction
The guidelines clearly differentiate between:
- CT arthrography (with intra-articular iodinated contrast) - which has specific clinical utility
- CT with IV contrast - which has no supported role in shoulder imaging 1
- CT without contrast - used only for bone assessment, not soft tissue evaluation
Research confirms that some centers inject both gadolinium and iodinated contrast during arthrography procedures, allowing for both MR and CT arthrography if needed 6.