Anat - Imaging of the Musculoskeletal System Flashcards Preview

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Flashcards in Anat - Imaging of the Musculoskeletal System Deck (24):
1

What factors influence the final xray image?

Tissue composition (radiodensity)
• Tissue thickness
• Position of the object wrt film and X-ray source
• Object shape
• Superimposition of tissues

2

Are the densities from most to least dense?

Lead
Bone
Muscle
Blood
Fat
Air

3

What are some factors which influence the appearance of the object?

Tissue thickness
Object shape

4

Which directions do we look at bones from?

Usually across and so the anterior and posterior components add up
Tubular bone = denser margin

5

Are densities additive?

Yes

6

What is the epiphysis?

The region of the epiphysial growth plate - sometimes still referred to even in adults when it has fused

7

What are trabecla?

Bony struts with marrow inbetween

8

Where is cancellous bone found?

At the prximal and distal ends

9

How many secondary epiphysis in the shoulder?

3

10

What can be seen in place of an epiphysis?

A white line (the remnant of the growth plate)

11

What is a nutrient foramen?

All bones possess larger or smaller foramina for the entrance of the nourishing blood-vessels; these are known as the nutrient foramina, and are particularly large in the shafts of the larger long bone

12

What is a suture in the skull?

It is a fibrous joint which can remain well into adultood

13

What covers the bone after the synovial joint?

Periosteum

14

What are we looking at when we see a film?

•Identity
• 2 views or more (projections)
• Alignment
• Joint surfaces and joint
• Trabecularbone and lines
• Bone outline
• Soft tissues
• Growth plates
• Invisible structures

15

How should the glenoid and the humeral head be positioned?

They should be congruent, they need to contact

16

What is the angle between the humerus and the

140

17

how should the shoulder be positioned for best function?

?

18

What films are used for most joint?

AP and lateral

19

What projections are used for the shoulder?

– AP
– Lateral
– Internal and external rotation
– Axillarylateral
– AP with cranio-caudal downtilt

20

Common fractures after dislocation of the shoulder?

v

21

Most common type of shoulder dislocation?

Antero-inferiro

22

Growth plates in the shoulder?

Lesser
Greater (tuberosity)
Humeral head

23

How many growth plates on the acromium?

3

24

How is the elbow usually visualised on x-ray?

– AP
– lateral
– AP oblique