Radioulnar joint Flashcards Preview

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Flashcards in Radioulnar joint Deck (20):
1

What type of joint is the radioulnar joint?

A pivot joint.

2

What movement of the forarm does the radioulnar joint allow?

Pronation and Supination

3

How many radioulnar joints are there?

2. One proximal and one distal.

4

Where is the proximal radioulnar joint?

Just distal to the elbow.

5

What forms the proximal radioulnar joint?

The radial head articulating with the radial notch on the ulna.

6

What holds the radial head in place?

The anular radial ligament. It is lined with synovial membane.

7

What produces pronation at the proximal radioulnar joint?

Pronator quadratus
pronator teres

8

What produces supination at the proximal radioular joint?

Supinator
Biceps Brachii

9

Where is the distal radioulnar joint?

Just proximal to the wrist joint

10

What articulates in the distal radioulnar joint?

Head of the ulnar and ulnar notch on radius

11

What does the articular disc do?

Bind the radius and ulna together
Separates the distsal radioulnar joint from the wrist joint

12

What moves to allow pronation and supination at the distal radioulnar joint?

The ulnar notch on the radius slides anteriorly over the head of the ulna

13

What causes pronation of the Distal radioulnar joint?

Pronator quadratus
Pronator teres

14

What causes supination of the distsal radioulnar joint?

Supinator
Biceps Brachii

15

What is the interosseous membrane?

A sheet of connective tissue that joins the radius and ulna together between the radioulnar joints

16

Where does the interosseous membrane attach?

Medial border of the radius
Lateral border of the ulna

17

What is the main functions of the interosseous membrane?

Holding the radius and ulna together during pronation and supination
Provides attachment for muscles
Transfer forces from the radius to the ulna

18

When thinking of fractures in the forearm, what is important to remember?

That usually the radius and ulna will break together.

19

What is a Monteggias fracture?

A force from behind the ulna causes the shaft to fracture and a dislocation of the radial head anteriorly at the elbow.

20

What is a Galeazzi fracture?

There is a fracture of the radius and the ulna head is dislocated at the distal radioulnar joint.