Proximal Radioulnar Joint

Question 1

What type of joint is the proximal radioulnar joint?

Answer 1

Synovial pivot joint

Question 2

How is this joint connected?

Answer 2

By interosseous membrane

Question 3

What are the movements of this joint?

Answer 3

Pronation and supination

Question 4

What is pronation?

Answer 4

Rotation of the radius around the ulna

Question 5

What is supination?

Answer 5

Rotation of the radius back to anatomical position

Question 6

What are the articular surfaces of this joint?

Answer 6

Head of radius with the radial notch of the ulna and annular ligament

Question 7

How does pronation and supination occur?

Answer 7

Due to the head of the radius rotating in relation to the ulna within the fibre-osseius ring created by the annular ligament and radial notch of the ulna

Question 8

What are the ligaments associated with this joint?

Answer 8

Annular ligament and Quadrate ligament

Question 9

What does the annular ligament prevent?

Answer 9

Posterolateral dislocation of the radius

Question 10

What ligaments blends with the radial collateral and ulnar collateral ligament?

Answer 10

Annular ligament

Question 11

What ligament is reinforced by the annular ligament?

Answer 11

Quadrate ligament

Question 12

What limits pronation and supination?

Answer 12

Quadrate ligament

Question 13

What allows pronation and supination?

Answer 13

Annular ligament

Question 14

What muscles are involved in pronation?

Answer 14

Pronator teres and pronator quadratus

Question 15

What muscles are involved in supination?

Answer 15

Biceps Brachii at 90 degrees flexion and supinator

Question 16

What is radioulnar syndesmosis?

Answer 16

Radial and ulnar shaft are connected by two syndesmoses called oblique cord and interosseous membrane