Imaging of Distal Radioulnar Joint Focused on Four-dimensional Computed Tomography: Toward a New Imaging Standard?

Area of Science:

• Orthopedics
• Radiology
• Sports Medicine

Background:

• Distal radioulnar joint (DRUJ) instability impacts forearm rotation and wrist stability.
• Causes include trauma, ligament injury, and degeneration, leading to pain and dysfunction.
• Accurate diagnosis is crucial due to complex anatomy, especially the triangular fibrocartilage complex.

Purpose of the Study:

• To review and outline the role of various imaging modalities in assessing DRUJ instability.
• To highlight the strengths and limitations of each technique for diagnosing DRUJ pathology.

Main Methods:

• Review of current literature on imaging techniques for DRUJ instability.
• Comparison of standard radiographs, ultrasound, CT, and MRI.
• Discussion of emerging dynamic imaging techniques.

Main Results:

• Radiographs assess bone alignment but lack soft tissue detail.
• Ultrasound offers dynamic assessment but is operator-dependent.
• CT excels in bony detail and congruity; MRI is superior for soft tissues like the triangular fibrocartilage complex.

Conclusions:

• A combination of imaging modalities is often necessary for comprehensive DRUJ instability assessment.
• Advanced techniques like 4D CT and real-time MRI show promise for dynamic instability evaluation.