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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
Why does the AC joint have a secondary rotary movement?
To allow the scapula to adjust its position to remain in close contact with the posterior chest wall
26
Which way would you angle for a PA projection?
Caudad to throw everything behind the clavicle downwards
27
AC joint dislocation?
Distal clavicle is displaced superiorly, most commonly from a fall
28
AC joint separation?
Partial/complete tear of AC or coracoclavicular ligament or both
29
Bankart lesion?
Possible small avulsion fracture of the anteriorinferior glenoid rim
30
Bursitis?
Inflammation of the bursae, formation of calcifications in associated tendons
31
Technique for clavicle?
75-85 kVp | 3 mAs
32
How much do we rotate the patient for SC joint obliques?
10-15 degrees
33
What happens to the upside SC joint when you perform an SC joint oblique?
It is foreshortened
34
What happens with only 5-10 degrees obliquity on an SC joint oblique?
The opposite SC joint would be visualized next to the vertebral column
35
How much weight do we use for AC joints weightbearing?
8-10lbs | 5-8lbs for smaller people
36
Lateral end of the clavicle and acromion apex demonstrate slightly greater AC joint space?
Patient rotated (a little) away from affected AC joint
37
Lateral end of the clavicle and acromion apex demonstrate closed joint space?
Patient rotated (a lot) away from affected AC joint
38
Increased superimposition of the clavicle and acromion and superior scapular angle is superior to the clavicle?
The MCP is tilted anteriorly
39
Lateral end of clavicle and acromion are rotated out of profile and the AC joint is closed? (Increased amount of scapula and thorax superimposition)
Patient is rotated towards affected side
40
Normal AC joint space?
0.3cm (.125")
41
What do we do differently for bilateral AC joints? Why?
183 SID to reduce magnification and allow both joints to fit on the IR
42
AP Axial AC joints (alexander method)?
15 deg cephalad angle

MRT Year 2 (18 decks)

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