page_title: Triangular fibrocartilage
section_title: Rotation
hierarchical_section_title: Triangular fibrocartilage / Function / Rotation
caption_attribution_description: English: Radioulnar ligaments (RULs) by pronation en supination.
context_page_description: The Triangular fibrocartilage complex is formed by the triangular fibrocartilage discus, the radioulnar ligaments and the ulnocarpal ligaments.
context_section_description: The TFCC is a major stabilizer of the DRUJ. To control the forearm rotation the DRUJ acts in concert with the proximal radioulnar joint. The connection between the distal radius and the distal ulna, maintain the congruency of the DRUJ.  This attachment is mainly created by the RUL’s of the TFCC. These ligaments support the joint through its arc of rotation.
  The role of the TFCC in supination and in pronation is a matter of dispute. Some authors (Schuind et al.) concluded that the dorsal fibers of the TFCC tighten in pronation, and the palmar fibers in supination. These conclusions are opposite of those published by Af Ekenstam and Hagert.
  Both parties are in fact right, as the RUL's consists of two ligaments each made of another two components: the superficial and the deep ligaments. During supination, the superficial palmar and the deep dorsal ligaments are tightened, preventing palmar translation of the ulna. In pronation this is reversed: the superficial dorsal and the deep palmar ligaments are tightened and prevent dorsal translation of the ulna.
caption: Rul’s prosupination
exif: {}