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The distal radioulnar ligaments: a biomechanical study
F Schuind1, K N An, L Berglund
1Department of Orthopedics, Mayo Clinic, Rochester, MN 55905.
The Journal of Hand Surgery
|November 1, 1991
Summary
The triangular fibrocartilage complex stabilizes the wrist during forearm rotation. Its ligaments tighten in specific positions, reducing laxity and enhancing wrist stability in pronation and supination.
Area of Science:
- Orthopedics
- Biomechanics
- Anatomy
Background:
- The triangular fibrocartilage complex (TFCC) is crucial for distal radioulnar joint (DRUJ) stability.
- Understanding its mechanical behavior is essential for diagnosing and treating wrist injuries.
Purpose of the Study:
- To investigate the mechanical roles of the triangular fibrocartilage complex and its associated ligaments.
- To quantify the changes in ligament tension and TFCC laxity during forearm rotation.
Main Methods:
- Stereophotogrammetric kinematic analysis to assess ligament tautness during supination and pronation.
- Mechanical testing of the TFCC under axial and transverse loads.
- Material property analysis of the palmar and dorsal components of the TFCC.
Main Results:
- Palmar radioulnar ligament tension increased in supination; dorsal radioulnar ligament tension increased in pronation.
- TFCC exhibited significant laxity under axial load, which decreased in pronation.
- TFCC showed reduced stiffness in neutral forearm rotation.
- Palmar and dorsal TFCC components demonstrated material properties akin to radiocarpal ligaments.
Conclusions:
- The palmar and dorsal radioulnar ligaments dynamically stabilize the DRUJ throughout forearm rotation.
- TFCC laxity is position-dependent, being reduced during pronation.
- The TFCC functions as a load-bearing structure with distinct mechanical properties in different forearm positions.