Radioulnar joint

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Last updated 9:28 PM on 7/11/26
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12 Terms

1
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Radiocalpar joint movements

Pronation and supination

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Pronation and supination

Both ends of the radius rotate around a fixed ulna
During pronation the radius rotates around the ulna and the two bones cross
During supination the radius and ulna uncross

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<p>Proximal radioulnar joint classification</p>

Proximal radioulnar joint classification

Synovial pivot

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Proximal radioulnar joint - anular ligament

Attaches from the anterior and posterior margins of the radial notch of the ulna
Wraps around the head of the radius like a collar
Has fibres which blend with the joint capsule and the radial collateral ligament

<p>Attaches from the anterior and posterior margins of the radial notch of the ulna<br>Wraps around the head of the radius like a collar<br>Has fibres which blend with the joint capsule and the radial collateral ligament</p>
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Anular ligament function

Keeps head of radius in place
Allows head of radius to rotate on the radial notch during pronation and supination

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Middle radioulnar joint

Syndesmossi
Formed by the strong interosseous membrane that connects the medial shft of the radius with the lateral shaft of the ulna

<p>Syndesmossi<br>Formed by the strong interosseous membrane that connects the medial shft of the radius with the lateral shaft of the ulna</p>
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Middle radioulnar joint functions

  1. Stops radius and ulna separating

  2. Acts as an attachment for muscles

  3. Transmission of forces

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Distal radioulnar joint

Pivot type joint

<p>Pivot type joint </p>
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Distal radioulnar joint articular surfaces

Convex shaped head of the ulna with the concave shaped ulnar notch on the medial side of the distal radius
Radius and ulna connected by an articular disc known as teh triangular fibrocartilaginous disc

<p>Convex shaped head of the ulna with the concave shaped ulnar notch on the medial side of the distal radius<br>Radius and ulna connected by an articular disc known as teh triangular fibrocartilaginous disc</p>
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Distal radioulnar joint - joint cavity and capsule

Joint cavity is L shaped and extends superiorly between the radius and ulna
The fibrous capsule encloses the joint cavity front and back
Proximal capsule has a loose sack-shaped recess called the sacciform recess

<p>Joint cavity is L shaped and extends superiorly between the radius and ulna<br>The fibrous capsule encloses the joint cavity front and back<br>Proximal capsule has a loose sack-shaped recess called the sacciform recess</p>
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Triangular fibrocartilaginous disc

Main connecting structure of the distal radioulnar joint
Attaches from the medial edge of the ulnar notch of the radius to the base of the head and the styloid process of the ulna
The articular disc separates the joint cavity of the distal radioulnar joint from the joint cavity of the radiocarpal joint below

<p>Main connecting structure of the distal radioulnar joint<br>Attaches from the medial edge of the ulnar notch of the radius to the base of the head and the styloid process of the ulna<br>The articular disc separates the joint cavity of the distal radioulnar joint from the joint cavity of the radiocarpal joint below</p>
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Triangular fibrocartilaginous disc functions

Main stabilizer of the radiocarpal joint
Transmits forces from carpal bones to the ulna