Elbow and Radioulnar Joints

Question 1

what is the purpose of the elbow and radioulnar joints?

Answer 1

• UE movement
• interaction with environment

Question 2

what bones are involved in the elbow and radioulnar joints?

Answer 2

humerus, radius, and ulna

Question 3

identify the landmarks of the humerus

Answer 3

• Medial epicondyle
• Lateral epicondyle
• Supracondyle ridge
• fossa
  
  • olecranon
  • radial
  • coronoid
• Capitulum
• Trochlea

Question 4

identify the landmarks of the radius

Answer 4

• head
• radial tuberosity

Question 5

identify the landmarks of the ulna

Answer 5

• Olecranon
• Coronoid process
• Ulnar tuberosity
• Trochlear notch
• Radial notch

Question 6

what kind of joint is the elbow joint and what ligaments and joints are involved?

Answer 6

• Hinge joint
• Ligaments involved: ulnar collateral, radial collateral, and annular
• Joints involved: humeroulnar, radiohumeral

Question 7

explain where the elbow joint is stable and where it looses some stability

Answer 7

• Most stable in full extension
• Becomes less stable with 20 degrees of flexion
  
  • more side-to-side laxity
  • requires ligamentous stability

Question 8

define carrying angle and what are some factors that influence it

Answer 8

• carrying angle = anatomical position
• Dominant limb>nondominant
• females>males due to hip width

Question 9

describe radioulnar joints and explain what kind of joint they are and the ligaments involved

Answer 9

• Pivot joint
• Ligaments involved: annular
  Interosseus membrane (between joints)
  2 locations: proximal and distal

Question 10

what are the 4 elbow flexors?

Answer 10

Biceps brachii
Brachialis
Brachioradialis
Pronator teres

Question 11

what is the 1 elbow extensor

Answer 11

triceps brachii

Question 12

what are the 3 pronators?

Answer 12

pronator teres
pronator quadratus
brachioradialis

Question 13

what are the 3 supinators?

Answer 13

supinator
biceps brachii
brachioradialis

Question 14

biceps brachii origin, insertion, movement, and innervation

Answer 14

Origin
- Coracoid process
- Supraglenoid tubercle
Insertion
- Bicipital aponeurosis
- Radial tuberosity
Movement
- Shoulder
- horizontal ADD
- flexion
- ABD in ER
- Elbow flexion
- Forearm supination
Innervation
- C5-C6
- Musculocutaneous nerve

Question 15

brachialis origin, insertion, movement, and innervation

Answer 15

Origin
- Distal anterior humerus
Insertion
- Coronoid process
Movement
- Elbow flexion
Innervation
- C5-C6
- Musculocutaneous nerve

Question 16

brachioradialis origin, insertion, movement, and innervation

Answer 16

Origin
- Lateral supracondylar ridge
Insertion
- Lateral radial styloid process
Movement
- Elbow flexion
- Forearm
- supination from pronation to
neutral
- pronation from supination to
neutral
Innervation
- C5-C8
- Radial nerve

Question 17

triceps brachii origin, insertion, movement, and innervation

Answer 17

Origin
- Infraglenoid tubercle
- Posterior humerus
Insertion
- Olecranon process
Movement
- Elbow extension
- Shoulder
- extension
- adduction
- horizontal ABD
Innervation
- C5-C8
- Radial nerve

Question 18

pronator teres origin, insertion, movement, and innervation

Answer 18

Origin
- Medial condyloid ridge
- Medial proximal ulna
Insertion
- Mid lateral radius
Movement
- Elbow flexion
- Forearm pronation
Innervation
- C6-C7
- Median nerve

Question 19

pronator quadratus origin, insertion, movement, and innervation

Answer 19

Origin
- Distal anterior ulna
Insertion
- Distal anterior radius
Movement
- Forearm pronation
Innervation
- C6-C7
- Median nerve

Question 20

supinator origin, insertion, movement, and innervation

Answer 20

Origin
- Lateral epicondyle
- Posterior ulna
Insertion
- Lateral proximal radius (below
radial head)
Movement
- Forearm supination
Innervation
- C5-C8
- Radial nerve

Question 21

elbow flexion

Answer 21

hand towards shoulder - 150 degrees

Question 22

elbow extension

Answer 22

hand away from shoulder - 0-10 degrees hyper extension

Question 23

supination

Answer 23

palm forward/up - 80-90 degrees from neutral

Question 24

pronation

Answer 24

palm backward/down - 70-90 degrees from neutral

Question 25

agonists and exercises of elbow flexion

Answer 25

A: biceps brachii, brachialis, brachioradialis
E: biceps curl

Question 26

agonists and exercises of elbow extension

Answer 26

A: triceps brachii
E: triceps press, triceps push up

Question 27

agonists and exercises of supination

Answer 27

A: biceps brachii, supinator, brachioradialis
E: TB supination

Question 28

agonists and exercises of pronation

Answer 28

A: pronator teres, pronator quadratus, brachioradialis
E: TB pronation

Question 29

identify tennis elbow technical name, muscles involved, and symptoms

Answer 29

Otherwise known as lateral epicondylitis

Muscles involved:
- extensor carpi radialis brevis
- extensor digitorum

Signs and symptoms
- pain in lateral elbow
- decreased wrist ROM
- decreased grip strength
- decreased wrist extension

Question 30

identify golfer’s elbow technical name, muscles involved, and symptoms

Answer 30

Otherwise known as medial epicondylitis

Muscles involved:
- medial wrist flexors
- pronators

Signs and symptoms
- pain in medial elbow
- decreased wrist ROM
- weakness with wrist flexion
- weakness with grip strength