Triangular fibrocartilage

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Triangular fibrocartilage
Vertical section through the articulations at the wrist, showing the synovial cavities. (Articular disc labeled at center left.)
Latin	discus articularis articulationis radioulnaris distalis
Gray's	subject #85 325
MeSH	triangular+fibrocartilage
Dorlands/Elsevier	d_22/12300668

The Triangular fibrocartilage complex (or articular disk of the distal radioulnar articulation) is triangular in shape, and is placed transversely beneath the head of the ulna, binding the lower ends of the ulna and radius firmly together.

Its periphery is thicker than its center, which is occasionally perforated.

It is attached by its apex to a depression between the styloid process and the head of the ulna; and by its base, which is thin, to the prominent edge of the radius, which separates the ulnar notch from the carpal articular surface.

Its margins are united to the ligaments of the wrist-joint.

Its upper surface, smooth and concave, articulates with the head of the ulna, forming an arthrodial joint; its under surface, also concave and smooth, forms part of the wrist-joint and articulates with the triquetral bone and medial part of the lunate.

Both surfaces are clothed by synovial membrane; the upper, by that of the distal radioulnar articulation, the under, by that of the wrist.

External links

• triangular+fibrocartilage at eMedicine Dictionary
• orthoped/349 at eMedicine - "Triangular Fibrocartilage Complex Injuries"
• Duke Orthopedics triangular_fibrocartilage_complex

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.