Articulatio radioulnaris distalis

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The articulatio radioulnaris distalis (" distal radial ulnar joint", distal radioulnar joint ; abbreviation DRUG ) is a joint of the upper extremity, in which the distal ends of the radius ( epiphysis distalis radii ) and ulna ( elbow head, caput ulnae ) are connected . The distal radioulnar joint is a wheel joint with only one axis of movement. The radius rotates around the ulna - with the involvement of the radioulnar joint close to the body - and thereby enables the hand to be turned around ( pronation and supination ).

The joint surface of the head of the elbow is called the circumferentia articularis , that of the lower end of the spoke is called the ulnar incisura . Immediately distal to the joint, the joint disc is attached to the ulna between the ulna and the triangular bone , which completely separates the distal radioulnar joint from the upper wrist . The stability of the joint is primarily ensured by a fibrous cartilaginous inter- joint disc , which is known as the " Triangular Fibro-Cartilaginous Complex " (TFCC).

complaints

The joint is of great importance for free wrist mobility, for free pronation and supination and for good stability. In particular, if the ulna is too long , which is often congenital or the result of a shortened radius fracture , damage to the cartilage complex and osteoarthritis of the distal radioulnar joint can occur.

Therapeutically, a partial or complete resection of the end of the elbow or a fusion of the distal end with the radius after resection of a proximal part of the diaphyseal can take place. There are also hemi- endoprostheses in which only the ulnar part is replaced by a prosthesis and the ligamentous apparatus is reconstructed. In addition, there are coupled total endoprostheses, such as the Scheker prosthesis, which are particularly useful for instability that cannot be treated otherwise.

literature

  • Ibrahim A. Kapandji: Functional Anatomy of the Joints: Schematically and annotated drawings on human biomechanics. 4th edition. Georg Thieme Verlag, 2006, ISBN 3-13-142214-9 , pp. 110–117.

Individual evidence

  1. ↑ Ilse Degreef, Luc De Smet: The Scheker distal radiulnar Joint arthroplasty to unravel a virtually unsolvable problem . In: Acta Orthopædica Belgica. 2013, Volume 79, pp. 141-145.