Elbow Joint

Question 1

Radiohumeral Joint:
What is the Open packed Position? Closed Packed Position? Capsular Pattern?

Answer 1

Open Packed Position: Full Extension and Supination
Closed Packed Position: 90 degrees flexion, 5 degrees supination
Capsular Pattern: Flexion > Extension > Supination > Pronation

Question 2

Ulnohumeral Joint:
What is the Open packed Position? Closed Packed Position? Capsular Pattern?

Answer 2

Open Packed Position: 70 degrees elbow flexion, 10 degrees supination
Closed Packed Position: full extension
Capsular Pattern: flexion > extension

Question 3

Proximal Radioulnar Joint:
What is the Open packed Position? Closed Packed Position? Capsular Pattern?

Answer 3

Open Packed Position: 70 degrees elbow flexion, 35 degrees supination
Closed Packed Position: 5 degrees supination
Capsular Pattern: supination > pronation

Question 4

What muscles produce elbow flexion?

Answer 4

Bicep Brachii
Brachialis
Brachioradialis

Question 5

What muscles produce elbow extension?

Answer 5

Triceps Brachii
Anconeus

Question 6

What muscles produce forearm supination?

Answer 6

biceps brachii
supinator

Question 7

what muscles produce forearm pronation?

Answer 7

pronator teres
pronator quadratus

Question 8

What is the annular ligament?

Answer 8

• Band of ligaments surrounding the head of the radius
• allows for rotation of the radius at the radial notch of the ulna.

Question 9

what is the anterior ligament?

Answer 9

This ligament stretches from the radial collateral ligament (RCL)n attaching the the upper portion of the coronoid fossa.

(just below the coronoid process)

Question 10

What is the cubital fossa?

What are its borders?

What are its contents?

Answer 10

This is a triangular space that is on the anterior aspect of the elbow?

BORDERS:

Brachioradialis/Pronator Teres/ad an imaginary line passing through the lateral and medial epicondyles of the humerus.

Contains several structures:

Tendon of the biceps brachii
median nerve
radial nerve
brachial artery
median cubital vein

Question 11

What is the cubital tunnel?

Answer 11

This is a space that is formed by the:
ulnar collateral ligament
flexor carpi ulnaris
medial head of the triceps
medial epicondyle

• ulnar nerve runs through the cubital tunnel?
• Cubital tunnel becomes the smallest with elbow flexion.

Question 12

What is the olecranon bursa?

Answer 12

Bursa laying posterior to the olecranon process.

considered to be the main bursa of the elbow

most commonly involved in inflammation due to direct trauma to the elbow.

Question 13

What is the posterior ligament?

Answer 13

the posterior ligament resembles the anterior ligament.

This blends into the collateral ligaments and is attached to the upper portion of the olecranon fossa and is below the olecranon process.

Question 14

What is the radial collateral ligament? (Lateral Collateral Ligament) LCL?

Answer 14

Extends from the lateral epicondyle of the humerus to the lateral border of the olecranon process of the ulna and to the annular ligament

Lateral Epicondyle > lateral border of the olecranon and annular ligament.

• Helps in preventing adduction of the elbow joint
• Reinforces the radiohumeral joint

Question 15

What is the ulnar collateral ligament? (Medial Collateral Ligament) MCL?

Answer 15

the ulnar collateral ligament runs from:

medial epicondyle of the humerus > proximal portion of the ulna.