Elbow kinesiology MS200

Question 1

How many joints are there to consider in the elbow and forearm?

Answer 1

Four joints: ulnohumeral, radiohumeral, proximal radioulnar, distal radioulnar.

Question 2

What is the closed pack position of the ulnohumeral joint?

Answer 2

Extension with supination.

Question 3

What is the capsular pattern of the ulnohumeral joint?

Answer 3

Flexion, extension.

Question 4

What is the typical dislocation pattern of the ulnohumeral joint?

Answer 4

Humerus moves anterior inferior.

Question 5

What type of joint is the ulnohumeral joint?

Answer 5

Hinge synovial.

Question 6

What is the main ligament associated with the ulnohumeral joint?

Answer 6

Medial / ulnar collateral ligament.

Question 7

What motion does the medial / ulnar collateral ligament limit?

Answer 7

Valgus motion / abduction.

Question 8

What are the movements allowed by the ulnohumeral joint?

Answer 8

• Flexion
• Extension.

Question 9

What is the closed pack position of the radiohumeral joint?

Answer 9

Elbow flexed to 90° with 5° supination.

Question 10

What is the typical dislocation pattern of the radiohumeral joint?

Answer 10

Humerus moves anterior inferior.

Question 11

What type of joint is the radiohumeral joint?

Answer 11

Uniaxial hinge synovial.

Question 12

What is the main ligament associated with the radiohumeral joint?

Answer 12

Lateral / radial collateral ligament.

Question 13

What motion does the lateral / radial collateral ligament limit?

Answer 13

Varus motion / adduction.

Question 14

What are the movements allowed by the radiohumeral joint?

Answer 14

• Flexion
• Extension.

Question 15

What is the closed pack position of the proximal radioulnar joint?

Answer 15

5° supination.

Question 16

What is the capsular pattern of the proximal radioulnar joint?

Answer 16

Equal limitation of supination and pronation.

Question 17

What is the typical dislocation pattern of the proximal radioulnar joint?

Answer 17

Radial head moves inferiorly out of the annular ligament.

Question 18

What type of joint is the proximal radioulnar joint?

Answer 18

Uniaxial pivot synovial.

Question 19

What are the two main ligaments of the proximal radioulnar joint?

Answer 19

• Annular ligament
• Oblique cord.

Question 20

What is the closed pack position of the distal radioulnar joint?

Answer 20

5° supination.

Question 21

What is the capsular pattern of the distal radioulnar joint?

Answer 21

Pain at extremes of rotation.

Question 22

What type of joint is the distal radioulnar joint?

Answer 22

Pivot synovial.

Question 23

What are the main ligaments of the distal radioulnar joint?

Answer 23

• Anterior radioulnar ligament
• Posterior radioulnar ligament.

Question 24

What movements occur at the distal radioulnar joint?

Answer 24

• Supination
• Pronation.

Question 25

What are the prime movers of elbow flexion?

Answer 25

* Biceps brachii * Brachialis * Brachioradialis.

Question 26

What is the primary action of biceps brachii?

Answer 26

Active flexor in all forearm positions against resistance.

Question 27

What is the strongest position for the biceps brachii during flexion?

Answer 27

Between 80° - 100° of flexion.

Question 28

What is the main action of the triceps brachii?

Answer 28

Active in resisted concentric extension and eccentric flexion.

Question 29

What role does the pronator teres play in elbow movements?

Answer 29

Active in pronation against resistance.

Question 30

What is the function of the radioulnar interosseous membrane?

Answer 30

Limits supination and pronation; stabilizes the distal joint during pronation.

Question 31

What is the typical carrying angle of the elbow in men?

Answer 31

5°.

Question 32

What is the typical carrying angle of the elbow in women?

Answer 32

10 - 15°.

Question 33

True or False: The ulnohumeral joint allows for both flexion and extension.

Answer 33

True.

Question 34

Fill in the blank: The __________ joint allows for supination and pronation.

Answer 34

proximal/distal radioulnar joint.

Question 35

convex head of radius moving in concave radial notch of ulna (at the proximal Radioulnar joint)

Answer 35

Opposite direction

Question 36

ulnar notch of radius slides over ulnar head and brings the disc with it (distal radioulnar joint)

Answer 36

Same direction

Question 37

Prime movers of the elbow

Answer 37

-biceps brachii -brachialis -brachioradialis (shunt mm) -triceps brachii -pronator teres -pronator quadratus -supinator

Question 38

Synergists of the elbow

Answer 38

-triceps - biceps - anconeus -pronator teres - flexor carpi ulnaris/radialis