inferior radioulnar joint

Question 1

classification

Answer 1

synovial pivot joint

Question 2

axes of movement

Answer 2

1 - vertical

Question 3

articular surfaces

Answer 3

distal ulna
distal radius
articular disk

Question 4

2 features of distal ulna

Answer 4

crescent shaped
lined with hyaline cartilage

Question 5

2 features of distal radius

Answer 5

biconcave with ulna notch
lined with hyaline cartilage

Question 6

1 feature of capsule

Answer 6

loose to allow movement

Question 7

where does articular disk run

Answer 7

lateral side of base of styloid process of ulna -> sharp inferior edge of ulna notch on radius

Question 8

2 features of articular disc

Answer 8

triangular fibrocartilaginous disc
principle structure uniting radius and ulna
increases stability of joint

Question 9

where does interosseous membrane run

Answer 9

between interosseous borders of radius and ulna

Question 10

what are the functions of interosseous membrane

Answer 10

divides forearm into anterior and posterior compartments
shock absorption and dissipation
attachment site for deep muscles

Question 11

degrees of pronation/supination

Answer 11

180

Question 12

what happens in pronation

Answer 12

rotation of the lower end of radius around the head of ulna

Question 13

what limits pronation/supination at superior radioulnar joint

Answer 13

tension in quadrate ligament

Question 14

what makes inferior radioulnar joint stable

Answer 14

articular disc
interosseous membrane
pronator quadratus