Internal fixation of fractures and beginning of external fixation Flashcards Preview

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Flashcards in Internal fixation of fractures and beginning of external fixation Deck (38):
1

Describe External skeletal fixation

Pass pins from outside the body and through both cortices of the bone in a transverse fashion
these fixation pins are then attached to atleast one external connecting bar

2

What forces are ESF good at controlling?

All forces

3

Old people call external skeletal fixator a what?

K-E apparatus

4

Do all ESF use metal clamps and connecting bars?

No

5

3 components of ESF

transfixation pin
clamp
connecting bar

6

3 components of ESF

transfixation pin
clamp
connecting bar

7

Which part of ESF goes intot he actual bone

Transfixation pins

8

If you use non threaded pins what are you supposed to do?

Angle them relative to eachother so they are harder to pull out

9

Differentiate negative and positive profile pins

.

10

Which is stronger positive or negative profile pins?

Positive

11

2 types of transfixation pins?

Half pin
Full pin

12

Does the pin have to penetrate both cortices?

Yes fully penetrate both cortices

13

Clamps are tightened with a?

Crescent wrench

14

What can you use instead of a clamp?

Wad of epoxy or something that hardens

15

What is the advantage and disadvantage of connecting bars?

Advantage : adjustable after you have it in place
Disadvantage: pins have to be in a straight line and of similar size

16

The minimum number of fixation pins that should be placed in the most proximal and distal fragments is?

3

17

Describe a type 1a fixator

unilateral uniplanar fixator
Weakest but most common

18

Describe a type 2 fixator

Bilateral uniplanar fixator

19

Describe a type 1b fixator

unilateral biplanar fixator

20

Why is the type 1b so common?

Very strong and no medial bar which means it can be used on the humeral and femoral fractures where the torso is medial

21

Describe a type 3 fixator

Bilateral biplanar fixator
90 degrees to eachother
too strong, bones don't reform

22

Want to make ESF stronger? Do what?

Connect the bars to eachother all the way through.

23

What is a type 1b fixator

unilateral biplanar fixator

24

What is a type 2 fixator

Bliateral uniplanar

25

What is an IM pin ESF tie in?

Combined IM pin and ESF
Join the IM pin to the connecting bar
much stronger and fewer transfixing pins

26

What is an IM pin ESF tie in?

Combined IM pin and ESF
Join the IM pin to the connecting bar
much stronger and fewer transfixing pins

27

When do we typically use transfixation casts?

Large animals to prevent compression

28

When do we typically use transfixation casts?

Large animals to prevent compression

29

What comprises circular external skeletal fixation?

Rings clmaps and wires that are very taught at 90 degrees to eachother

30

What part of circular external skeletal fixation stimulates bone healing

small amount of bounce that it has

31

Best time to use circular external skeletal fixation?

Short proximal or distal fragments to be dealt with

32

If ESF is only fixation how man pins per major fragment?
What about with IM pin?

3 through both cortices
1-2 pins per main fragment

33

Do transfixation pins ever not penetrate both cortices/

NO

34

Positive profile pins need what done prior to putting them in

Need to pre drill a hole

35

5 advantages of ESF

Minimal blood supply disruption
HArdware removal may not require GA
Fixator removal can be done in stages to gradually transfer forces back to the limbs
Can be used in highly comminuted fractures
Good to deal with short proximal or distal fragments

36

5 advantages of ESF

Minimal blood supply disruption
HArdware removal may not require GA
Fixator removal can be done in stages to gradually transfer forces back to the limbs
Can be used in highly comminuted fractures
Good to deal with short proximal or distal fragments

37

2 Disadvantages of ESF

Not so hot for proximal large bones
Hardware removal required

38

ESF is a good choice for? (5)

Open fractures or degloving injuries
highly comminuted fractures
fractures with short proximal or distal fragments
stabilization of corrective osteotomies
distraction osteogenesis