Indirect MR arthrography: concepts and controversies

Area of Science:

• Radiology
• Medical Imaging

Background:

• Indirect MR arthrography uses intravenous Gadolinium contrast for delayed MR imaging.
• It offers higher patient acceptance compared to direct intra-articular injections.
• Factors like synovial area and vascularity influence contrast uptake.

Purpose of the Study:

• To evaluate the efficacy and characteristics of indirect MR arthrography.
• To compare indirect MR arthrography with direct MR arthrography.
• To identify factors influencing indirect MR arthrography quality.

Main Methods:

• Intravenous administration of Gadolinium contrast.
• Delayed MR imaging after contrast injection.
• Assessment of factors affecting contrast uptake and image quality.

Main Results:

• Indirect MR arthrography can yield images similar to direct arthrography.
• Enhanced vascular tissue within and around the joint is a notable feature.
• Lack of contrast compartmentalization limits assessment of abnormal joint communications.
• Suboptimal imaging can result from inadequate contrast diffusion.

Conclusions:

• Indirect MR arthrography is an attractive alternative due to patient preference and logistical ease.
• Radiologists must consider the enhancement of vascular tissues.
• Optimizing image quality depends on adequate time delay and potentially patient exercise.