How to Read a Wrist MRI: A Patient's Guide
Decode your wrist MRI report including TFCC evaluation, scaphoid fracture detection, and carpal tunnel findings.
Wrist MRI provides exquisite detail of the complex anatomy packed into this small joint. With eight carpal bones, numerous intercarpal ligaments, the TFCC, and multiple tendons, wrist MRI requires careful technique and systematic interpretation. This guide explains what key structures look like on MRI and what common abnormalities mean for your diagnosis.
MRI Sequences for the Wrist
- T1-weighted images: best for bone anatomy, showing fatty marrow as bright signal and cortical bone as dark
- T2-weighted with fat saturation: highlights fluid, edema, and inflammation as bright signal against suppressed background fat
- 3D gradient echo sequences: provide thin-slice coverage ideal for small structures like intercarpal ligaments
- MR arthrogram: contrast injected into the joint improves detection of TFCC tears, ligament perforations, and cartilage defects
TFCC on MRI
The TFCC is best evaluated on coronal images. A normal TFCC appears as a dark, triangular structure extending from the ulnar aspect of the distal radius to the base of the ulnar styloid. Tears appear as increased signal extending through the disc on T2 images. Central perforations (degenerative) show a defect in the disc substance, while peripheral tears show signal changes at the ulnar or radial attachment. MR arthrogram significantly improves sensitivity. For more on TFCC injuries, see our wrist injury types guide.
Scaphoid on MRI
MRI is the gold standard for detecting occult scaphoid fractures not visible on X-ray. Acute fractures show a low-signal line on T1 images with surrounding bright marrow edema on T2/STIR sequences. Avascular necrosis of the proximal pole appears as decreased signal on both T1 and T2 images, indicating loss of normal fatty marrow. Nonunion shows persistent fracture line with sclerotic margins and possible cystic changes. Learn about treatment decisions in our article on scaphoid fracture healing.
Carpal Tunnel on MRI
MRI of carpal tunnel syndrome shows characteristic changes on axial images at the level of the hook of hamate. The median nerve may appear swollen (increased cross-sectional area greater than 10 square millimeters), flattened at the level of compression, and show increased T2 signal indicating edema. The flexor retinaculum may bow palmarly. These findings correlate with nerve conduction study results and help guide treatment decisions.
Key Takeaways
- MR arthrogram is the most sensitive technique for TFCC tears and ligament perforations
- MRI detects occult scaphoid fractures that X-rays miss, preventing delayed treatment
- Avascular necrosis shows as decreased signal on both T1 and T2, a concerning finding
- Median nerve swelling and flattening on MRI correlates with carpal tunnel severity
Frequently Asked Questions
Is MR arthrogram better than standard MRI for wrist problems?
MR arthrogram is superior for detecting TFCC tears, intercarpal ligament injuries, and small cartilage defects because the injected contrast distends the joint and outlines structures that may otherwise be difficult to see. Standard MRI is usually sufficient for fractures, carpal tunnel, tendon problems, and ganglion cysts.
Can MRI miss a wrist fracture?
MRI has very high sensitivity for bone injuries and rarely misses fractures. It detects bone marrow edema from stress reactions even before a visible fracture line develops. However, very small cortical fractures without marrow edema could theoretically be missed, which is why CT may be used as a complementary study in certain cases.
Related Articles
Learn about common wrist conditions including TFCC tears, scaphoid fractures, carpal tunnel syndrome, de Quervain's, and ganglion cysts.
Understand scaphoid fracture healing rates by location, cast treatment versus surgical fixation, and the blood supply challenge.
Lichtman stages I–IV of Kienbock disease — lunate avascular necrosis, MRI signal evolution, fragmentation, collapse, and treatment by stage.
Related Conditions
Ready to analyze your imaging? Upload your MRI or X-ray for AI-powered analysis
Upload your MRI or X-ray DICOM files for private, AI-powered analysis. 4 models analyze independently — all data stays in your browser.
Start AnalysisMedical Disclaimer: This page is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. AI-generated analysis may contain errors. Always consult a qualified healthcare professional for medical decisions. Full Disclaimer