Upper Limb - Elbow

Question 1

What are the 3 articulation of the elbow joint?

Answer 1

humeroradial
humeroulnar
proximal radioulnar

Question 2

What forms the humeroradial articulation?

Answer 2

capitellum of the distal humerus and the head of the radius

Question 3

What forms the humeroulnar articulation?

Answer 3

trochlea of the distal humerus and the trochlear fossa of the proximal ulna

Question 4

what forms the proximal radioulnar articulation ?

Answer 4

head of the radius and the radial notch of the proximal ulna

Question 5

What is the range of flexion extension of the elbow?

Answer 5

140 degrees flexion

0 degrees extension

Question 6

Which articulation permits pronation and supination?

Answer 6

proximal radioulnar articulation

Question 7

What is the name of the ligamentous sling that binds the radius to the ulna?

Answer 7

annular ligament

Question 8

What is the total range of pronation-supination?

Answer 8

150 degrees
70 degrees pronation
80 degrees supination

Question 9

What process assists in coping with forces in anteroposterior and posteroanterior directions?

Answer 9

olceranon process

Question 10

Which structures provide stability in side to side movements?

Answer 10

two collateral ligaments

Question 11

Which collateral ligament is more important and why?

Answer 11

medial collateral (ulnar)

consider the forces going through it in throwing/falling etc

Question 12

Why are elbow joint forces high?

Answer 12

Large muscle forces need to be generated to perform certain activities to pull the two sides of the joint together