Distal Radioulnar Joint: Anatomy, Instability, and MRI
A practical radiology review of Distal Radioulnar Joint: Anatomy, Instability, and MRI, focused on imaging findings, differential diagnosis, reporting points, and high-yield...
RadPhrases Editorial Team2 min read
A practical radiology review of Distal Radioulnar Joint: Anatomy, Instability, and MRI, focused on imaging findings, differential diagnosis, reporting points, and high-yield teaching pearls.
Anatomy & Biomechanics
- Pivot joint → pronation/supination
- Intrinsically unstable → relies on soft tissues
Articular surfaces
- Radial sigmoid notch
- Ulnar head (hub + seat)
- Fovea = key stabilizer attachment site
- Sigmoid notch larger → allows translation → instability
Stabilizers
- Intrinsic (primary)
- TFCC (main stabilizer)
- Central disk (shock absorber, avascular)
- DRULs (true stabilizers )
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