Changes in the TFCC Articular Disk during Forearm Rotation: A Study of Configuration and Surface Strains
The triangular fibrocartilage complex (TFCC) of the wrist is a multifunctional structure composed of several anatomical components.10 The horizontal portion of the TFCC, often referred to as the triangular fibrocartilage proper or TFC, is triangular in shape and composed of the articular disk and the dorsal and palmar radioulnar ligaments. The TFC forms a continuation of the distal radial articular surface from its radial attachment at the sigmoid notch to its apical attachment in the eccentric concavity of the ulnar head (fovea) and the projecting ulnar styloid. The disk provides an interface between the ulnar head and ulnar carpus, with the biconcave shape serving to reduce the geometric incongruencies between the bony surfaces. The peripheral margins of the TFC (radioulnar ligaments) are thicker and composed of longitudinally oriented collagen fibers, structurally adapted to bear tensile loading. The central portion (articular disk) is thinner and the collagen fiber pattern has multiple obliquities to the surface, implying that variable loading conditions occur.3,4
KeywordsSurface Strain Articular Disk Forearm Rotation Area Strain Ulnar Head
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