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MRT Year 2 > Clavicle Comp > Flashcards

Clavicle Comp Flashcards

1
Q

What happens when the patient is rotated towards the affected shoulder?

A

The medial end of the clavicle is drawn away from the vertebral column
The clavicle is longitudinally foreshortened

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2
Q

Where do 80% of fractures occur?

A

The middle 1/3rd

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3
Q

Where do 15% of fractures occur?

A

The lateral 1/3rd`

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4
Q

The superior scapular angle is superior to clavicle. What positioning error has occured?

A

The upper MCP is tilted anteriorlyq

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5
Q

What does the axial clavical demonstrate?

A

Non-displaced fractures that can’t be demonstrated on the AP due to overlap of scapula and ribs

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6
Q

How much and why do we angle for an AP axial clavicle?

A

15-30 degrees cephalad to throw the clavicle off of the thorax and demonstrate a fracture displacement

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7
Q

How to angle for thinner patients?

A

10-15 degrees more angle

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8
Q

How do you angle if a patient has a natural slouch/kyphotic?

A

Angle more

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9
Q

How do you know your angle is correct for an AP axial clavicle?

A

The lateral and middle 1/3rds are superior to thorax and scapula

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10
Q

How many curves does the clavicle have?

A

2

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11
Q

Parts of the clavicle?

A
  • Sternal (medial) extremity (end)
  • Acromial (lateral) extremity (end)
  • Body
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12
Q

What form the jugular notch?

A

The sternoclavicular joints and the manubrium

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13
Q

What is the acromial end of the clavicle like?

A

Downward curvature, flattened

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14
Q

What is the sternal end of the clavicle like?

A

Directed downward, triangular shaped

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15
Q

Female clavicles

A

Shorter

Less curved

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16
Q

Male clavicles

A

Thicker

More curved, most curved in heavily muscled men

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17
Q

What does the shoulder girdle consist of?

A
  • AC joint
  • SC joint
  • Scapulohumeral joint
18
Q

What makes up the shoulder girdle?

A

The clavicle and scapula

19
Q

What is the shoulder girdle for?

A

Connect each upper extremity with the trunk/axial skeleton

20
Q

Classification of all joints of the shoulder girdle?

A

Synovial

Diarthrodial

21
Q

Classification of the scapulohumeral joint?

A
  • Spheroidal/ball and socket

- Flexion/extension, adduction/abduction, circumduction, med/lat rotation

22
Q

Classification of the sternoclavicular joint?

A
  • Double plane/gliding

- Limited gliding movement

23
Q

Classification of the acromialclavicular joint?

A
  • Plane/gliding

- Gliding/secondary rotary movement

24
Q

Why is the SC joint classed as a double plane joint?

A

It articulates with the manubrium and cartilage of the first rib

25
Q

Why does the AC joint have a secondary rotary movement?

A

To allow the scapula to adjust its position to remain in close contact with the posterior chest wall

26
Q

Which way would you angle for a PA projection?

A

Caudad to throw everything behind the clavicle downwards

27
Q

AC joint dislocation?

A

Distal clavicle is displaced superiorly, most commonly from a fall

28
Q

AC joint separation?

A

Partial/complete tear of AC or coracoclavicular ligament or both

29
Q

Bankart lesion?

A

Possible small avulsion fracture of the anteriorinferior glenoid rim

30
Q

Bursitis?

A

Inflammation of the bursae, formation of calcifications in associated tendons

31
Q

Technique for clavicle?

A

75-85 kVp

3 mAs

32
Q

How much do we rotate the patient for SC joint obliques?

A

10-15 degrees

33
Q

What happens to the upside SC joint when you perform an SC joint oblique?

A

It is foreshortened

34
Q

What happens with only 5-10 degrees obliquity on an SC joint oblique?

A

The opposite SC joint would be visualized next to the vertebral column

35
Q

How much weight do we use for AC joints weightbearing?

A

8-10lbs

5-8lbs for smaller people

36
Q

Lateral end of the clavicle and acromion apex demonstrate slightly greater AC joint space?

A

Patient rotated (a little) away from affected AC joint

37
Q

Lateral end of the clavicle and acromion apex demonstrate closed joint space?

A

Patient rotated (a lot) away from affected AC joint

38
Q

Increased superimposition of the clavicle and acromion and superior scapular angle is superior to the clavicle?

A

The MCP is tilted anteriorly

39
Q

Lateral end of clavicle and acromion are rotated out of profile and the AC joint is closed? (Increased amount of scapula and thorax superimposition)

A

Patient is rotated towards affected side

40
Q

Normal AC joint space?

A

0.3cm (.125”)

41
Q

What do we do differently for bilateral AC joints? Why?

A

183 SID to reduce magnification and allow both joints to fit on the IR

42
Q

AP Axial AC joints (alexander method)?

A

15 deg cephalad angle

MRT Year 2 (18 decks)

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