Pathology in the Elbow

Question 1

What range of motion do the following joints allow for?

• Humero-ulnar joint
• Radio-capitellar joint

Answer 1

Humero-ulnar = flexion/extension of the elbow

Radio-capitellar = supination/pronation of the forearm

Question 2

What does the triceps insert into?

What is this muscle’s nerve supply and chief function?

Answer 2

Olecranon process of the ulna

Nerve supply = radial nerve

Chief function = extension of the elbow

Question 3

Where does the brachialis insert into?

What is this muscle’s innervation and chief function?

Answer 3

Inserts into the coronoid process of the ulna

Innervation = musculocutaneous nerve and radial nerve

Chief function = flexion of the elbow

Question 4

What muscles supinate the elbow?

Answer 4

Biceps brachii and the supinator muscle

Question 5

What muscles pronate the elbow?

Answer 5

Pronator teres and Pronator quadratus

Question 6

What is the a) common extensor origin and b) common flexor origin for muscles of the forearm?

Answer 6

Common extensor origin = lateral epicondyle of the humerus

Common flexor origin = medial epicondyle of the humerus

Question 7

Tennis elbow affects the (medial/lateral) epicondyle

Golfer’s elbow affects the (medial/laterl) epicondyle

Which is more common?

Answer 7

Tennis = lateral (extensor origin), caused by repeated resisting of wrist extension

Golfer = medial (flexor origin)

Tennis elbow is more common

Question 8

(OA/RA) most commonly affects the elbow

Answer 8

RA commonly affects the elbow

OA typically doesn’t affect the elbow (unless there is a history of trauma)

Question 9

What is the weight limit than can be lifted by someone that has had an elbow replacement?

Answer 9

2.5 kg