Distal radioulnar joint

Distal radioulnar joint: Anatomy & FunctionAnatomy, functions, innervation and blood supply of the distal radioulnar joint.
~ 2 min

The radius and ulna are connected to each other by the proximal radioulnar joint (articulatio radioulnaris proximalis) and the distal radioulnar joint (articulatio radioulnaris distalis).

The first is part of a larger elbow joint, which is considered in greater detail in the corresponding pdf-note.

Let’s learn about the structure of the distal radioulnar joint.

Distal radio-ulnar joint (art. radioulnaris distalis) – back surface
Distal radio-ulnar joint (art. radioulnaris distalis) - back surface
Distal radio-ulnar joint (art. radioulnaris distalis) – palmar surface
Distal radio-ulnar joint (art. radioulnaris distalis) - palmar surface
Distal radio-ulnar joint (art. radioulnaris distalis) – sawing
Distal radio-ulnar joint (art. radioulnaris distalis) - sawing

It is formed between the articular surfaces on the articular circumference of the ulna (circumferentia articularis ulnae) and the ulnar notch of the radius (incisura ulnaris radii).

Articular circumference of the ulna (circumferentia articularis ulnae)
Articular circumference of the ulna (circumferentia articularis ulnae)
Ulnar notch of the radius (incisura ulnaris radii)
Ulnar notch of the radius (incisura ulnaris radii)

The joint capsule is attached along the edge of the articular surfaces.

Distal radio-ulnar joint
Distal radio-ulnar joint

There is a slight protrusion of the articular capsule between the distal parts of the forearm bones, called the sacciform recess (recessus sacciformis).

Sacciform recess (recessus sacciformis) – sawing
Sacciform recess (recessus sacciformis) - sawing

According to the classification, the joint is simple, cylindrical, uniaxial, combined, and complex.

When motion in the joint takes place, the proximal epiphysis of the radius rotates in place, and the distal epiphysis slides along the articular circumference of the ulna along an arc around the head of the ulna, which remains immobile.

In addition, when the radius rotates, the hand also rotates with it.

The auxiliary apparatus of the joint includes the articular disc (discus articularis).

Articular disc (discus articularis)
Articular disc (discus articularis)

It is located between the ulnar notch of the radius and the styloid process of the ulna in the form of a triangular fibrous-cartilaginous lamina. The disc separates the distal radioulnar joint from the wrist joint and represents a kind of articular fossa for the head of the ulna.

The following vessels and nerves take part in the blood supply and innervation of the elbow joint.

Arteries: radial artery (a. radialis), ulnar artery (a. ulnaris)

Veins: the blood outflows through the veins with the same name.

Nerves: median nerve (n. medianus), ulnar nerve (n. ulnaris), radial nerve (n. radialis)

Dictionary

Distal radioulnar joint

distal radioulnar joint
articulatio radioulnaris distalis
radius
radius
ulna
ulna
articular circumference of head of ulna
circumferentia articularis ulnae
ulnar notch of radius
incisura ulnaris radii
sacciform recess
recessus sacciformis
articular disc
discus articularis
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