Distal radioulnar articulation

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Distal radioulnar articulation

Ligaments of wrist. Anterior view.

Vertical section through the articulations at the wrist, showing the synovial cavities
Latin	Articulatio radioulnaris distalis
Gray's	subject #85 325

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:

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.^[1]

Estaminet Classification

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

Estaminet I - Attenuation on MRI only
Estaminet II - Volar distal radioulnar ligament is involved. Unstable in supination. Fixation should be in pronation.
Estaminet III - Dorsal distal radioulnar ligament is involved. Unstable in pronation. Fixation should be in supination.
Estaminet IV - Both ligaments are involved. Unstable in both supination and pronation. Fixation is in neutral.

Additional images

Distal ends of radius and ulna along with the bones of the wrist and hand
Transverse section across distal ends of radius and ulna.

References

↑ 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

This article incorporates text from a public domain edition of Gray's Anatomy.

External links

elbow/elbowbones/bones5 at the Dartmouth Medical School's Department of Anatomy

Joints and ligaments of upper limbs (TA A03.5, GA 3.313)

Shoulder

Sternoclavicular	Anterior sternoclavicular Posterior sternoclavicular Interclavicular Costoclavicular

Acromioclavicular	Syndesmoses: Coracoacromial Superior transverse scapular Inferior transverse of scapula Synovial: Acromioclavicular Coracoclavicular (trapezoid conoid)

Glenohumeral	Capsule Coracohumeral Glenohumeral (superior, middle, and inferior) Transverse humeral Glenoid labrum

Elbow

Humeroradial	Radial collateral

Humeroulnar	Ulnar collateral

Proximal radioulnar	Anular Oblique cord Quadrate

Forearm

Distal radioulnar	Palmar radioulnar Dorsal radioulnar Interosseous membrane of forearm

Hand

Wrist/radiocarpal	Dorsal radiocarpal/Palmar radiocarpal Dorsal ulnocarpal/Palmar ulnocarpal Ulnar collateral/Radial collateral

Intercarpal midcarpal	Radiate carpal Dorsal intercarpal Palmar intercarpal Interosseous intercarpal Scapholunate Pisiform joint (Pisohamate Pisometacarpal)

Carpometacarpal	Dorsal carpometacarpal Palmar carpometacarpal thumb: Radial collateral Ulnar collateral

Intermetacarpal	Deep transverse metacarpal Superficial transverse metacarpal

Metacarpophalangeal	Collateral Palmar

Interphalangeal	Collateral Palmar

Other	Carpal tunnel Ulnar canal

M: JNT

anat (h/c, u, t, l)/phys

noco (arth/defr/back/soft)/cong, sysi/epon, injr

proc, drug (M01C, M4)

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