The Elbow (unfinished)

Question 1

What two joints make up the elbow?

Answer 1

• Humeroulnar

• Humeroradial

Question 2

What are the ranges of movement at the elbow?

Answer 2

• 135-145º flexion

• 0-5º

• 85º supination

• 75º pronation

Question 3

When is the humeroulnar joint in an open packed position?

Answer 3

70º flexion and 10º supination

Question 4

When is the humeroulnar joint in a closed packed position?

Answer 4

Full elbow extension with supination

Question 5

When is the humeroradial joint in an open packed position?

Answer 5

Full extension and full supination

Question 6

When is the humeroradial joint in a closed packed position?

Answer 6

90º elbow flexion and 5º supination

Question 7

When is the proximal radioulnar joint in an open packed position?

Answer 7

70º flexion and 35º supination

Question 8

When is the proximal radioulnar joint in a closed packed position?

Answer 8

5º supination

Question 9

What are the articulating surfaces of the humeroulnar joint?

Answer 9

Trochlea of humerus and trochlear notch of ulna

Question 10

What are the articulating surfaces of the humeroradial joint?

Answer 10

Capitalism of humerus and fovea of radius

Question 11

Where does the annular ligament attach?

Answer 11

Anterior and posterior margins of the radial notch

Question 12

Which ligament is made of 3 bands?

Answer 12

Ulnar (medial) collateral ligament

Question 13

Where do the bands of the ulnar collateral ligament attach?

Answer 13

• Anterior - medial epicondylitis to the coronoid process

• Intermediate - medial epicondyle on to the transverse band

• Posterior - medial epicondyle to the medial edge of the olecranon

Question 14

Where does the radial collateral ligament attach?

Answer 14

Lateral epicondyle and merges with the annular ligament

Question 15

What is the role of the annular ligament?

Answer 15

Maintain the radial head within the radial notch on the ulna

Question 16

What is the role of the ulnar collateral ligament?

Answer 16

Limits the ability for the elbow to abduct and offers constraint into a valgus force

Question 17

What is the role of the radial collateral ligament?

Answer 17

Prevents adduction at the elbow and resist varus forces

Question 18

What muscles are involved in flexion?

Answer 18

• Biceps brachii

• Brachialis

• Brachioradialis

• Pronator teres

Question 19

What muscles are involved in extension?

Answer 19

• Triceps brachii

• Anconeus

Question 20

What muscles are involved in pronation?

Answer 20

• Pronator teres

• Pronator quadratics

• Brachioradialis

Question 21

What muscles are involved in supination?

Answer 21

• Supinator

• Biceps brachii

• Brachioradialis