Distal radioulnar articulation

Distal radioulnar articulation

Ligaments of wrist. Anterior view.

Vertical section through the articulations at the wrist, showing the synovial cavities
Details
Identifiers
Latin Articulatio radioulnaris distalis
TA A03.5.10.001
FMA 35290

Anatomical terminology

The distal radioulnar articulation (inferior radioulnar joint) is a joint between the two bones in the forearm; the radius and ulna. It is one of two joints between the radius and ulna, the other being the proximal radioulnar articulation. The distal radioulnar articulation is the one of the two closest to the wrist and hand.

The distal radioulnar articulation pivot-joint formed between the head of ulna and the ulnar notch on the lower extremity of radius.

Ligaments

The articular surfaces are connected together by the following ligaments:

Function

The function of the radioulnar joint is to lift and maneuver weight load from the distal radioulnar joint to be distributed across the forearm’s radius and ulna as a load-bearing joint.[1] Supination of the radioulnar joint can move from 0 degrees neutral to approximately 80-90 degrees where Pronation of the Radioulnar Joint can move from 0 degrees neutral to approximately 70-90 degrees.[2] Supination (palms facing up) vs. pronation (palms facing down). Muscles that contribute to function are all supinator (Biceps Brachii, Brachioradialis, and Supinator) and pronator muscles (Brachioradialis, Pronator Quadratus, and Pronator Teres).

Injuries

Injuries to the distal radioulnar articulation often result from falls onto an outstretched hand. Injury can occur with concurrent fracture of the distal radius, the ulna, or can be isolated. A classification system has been proposed by Estaminet and colleagues.[3]

Estaminet Classification

Estaminet classified injuries of the distal radioulnar articulation into four categories with two subclasses: purely ligamentous (subclass A) and those with associated boney injury (subclass B).

Additional images

See also

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

  1. Lees, V. (2013). Functional anatomy of the distal radioulnar joint in health and disease. Annals of The Royal College of Surgeons of England, 95(3), 163–170. doi:10.1308/003588413X13511609957452
  2. Thomas, B. P., & Sreekanth, R. (2012). Distal radioulnar joint injuries. Indian Journal of Orthopaedics, 46(5), 493–504. doi:10.4103/0019-5413.101031
  3. Estaminet et al. Estaminet-Klassifikation von distal radioulnar Aussprache-Trauma. 20. Jahresversammlung der europäischen Orthopädischen Forschungsgesellschaft (EORS 2012), am 26–28 September, Amsterdam, Die Niederlande

External links

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