The Acromioclavicular Joint Flashcards Preview

ESA 2- Musculoskeletal System > The Acromioclavicular Joint > Flashcards

Flashcards in The Acromioclavicular Joint Deck (35):
1

What kind of joint is the acromioclavicular?

A plane type of synovial joint

2

Where is the acromioclavicular joint located?

Where the lateral end of the clavicle articulates with the acromion of the scapula

3

Where can the acromioclavicular joint be palpated?

During a shoulder examination, 2-3cm medially from the ‘tip’ of the shoulder

4

What is the shoulder formed by?

The end of the acromion

5

What does the acromioclavicular joint consist of?

An articulation between the lateral end of the clavicle and the acromion of the scapula

6

What are the atypical features of the acromioclavicular joint?

The articular surfaces of the joint are lined with fibrocartilage (as opposed to hyaline cartilage) 
The joint cavity is partially divided by an articular disc

7

What is the articular disc of the acromioclavicular joint?

A wedge of fibrocartilage suspended from the upper part of the capsule

8

What does the joint capsule of the acromioclavicular joint consist of?

A loose fibrous layer which encloses the two articular surfaces

9

What does the joint capsule give rise to?

The articular disc

10

What is the posterior aspect of the joint capsule reinforced by?

Fibres from the trapezius muscle

11

What is the joint capsule of the acromioclavicular joint lined internally by?

A synovial membrane

12

What does the synovial membrane of the joint capsule do?

Secretes synovial fluid into the cavity of the joint

13

What are the major ligaments present in the acromioclavicular joint?

Acromioclavicular 
Conoid 
Trapezoid

14

Where does the acromioclavicular ligament run?

Horizontally from the acromion to the lateral clavicle

15

What does the acromioclavicular ligament do?

Covers the joint capsule, reinforcing its superior aspect

16

Where does the conoid ligament run?

Vertically form the coracoid process of the scapula to the conoid tubercle of the clavicle

17

Where does the trapezoid ligament run?

From the coracoid process of the scapula to the trapezoid line of the clavicle

18

What are the conoid and trapezoid ligaments collectively known as?

The coracoclavicular ligament

19

What does the coracoclavicular ligament do?

Effectively suspends the weight of the upper limb from the clavicle

20

What does the acromioclavicular joint allow?

A degree of axial rotation and anterioposterior movement

21

Which muscles act on the acromioclavicular joint?

None

22

What is the result of no muscles acting on the acromioclavicular joint?

All movement is passive, and initiated by movement at other joints

23

What is the arterial supply to the acromioclavicular joint via?

The suprascapular artery 
The thoraco-acromial artery

24

What does the suprascapular artery arise from?

The subclavian artery at the thyrocervical trunk

25

What does the thoraco-acromial artery arise from?

The axillary artery

26

What are the veins of the acromioclavicular joint?

They follow the major arteries

27

What is the acromioclavicular joint innervated by?

Articular branches of the suprascapular and lateral pectoral nerves

28

Where do the nerves innervating the acromioclavicular joint arise from?

The brachial plexus

29

When does acromioclavicular joint dislocation occur?

When the two articulating surfaces of the joint are separated

30

What is acromioclavicular joint dislocation associated with?

Joint soft tissue damage

31

What does acromioclavicular joint dislocation commonly occur from?

A direct blow to the joint, or a fall on an outstretched hand

32

When is a dislocation of the acromioclavicular joint more serious?

If a ligamental rupture occurs, of the acromioclavicular or the coracoclavicular ligaments

33

What happens is the coracoclavicular ligament is torn?

The weight of the upper limb is not supported, and the shoulder moves inferiorly, increasing the prominence of the clavicle

34

What does management of an AC joint dislocation depend on?

The injury severity and impact on quality of life

35

What do the treatment options of an AC joint dislocation range from?

Ice and rest, to ligament reconstruction surgery