Lecture 25 - Fracture Mechanics Flashcards Preview

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Flashcards in Lecture 25 - Fracture Mechanics Deck (47)
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1

What is a Type I Salter fracture?

Straight across

2

What is a Type II Salter fracture?

Above

3

What is a Type III Salter fracture?

Lower or beLow

4

What is a Type IV Salter fracture?

Two

OR

Through

5

What is a Type V Salter fracture?

ERasure of the growth plate

OR

cRush

6

What are the 5 components used to describe a fracture?

  1. Open or Closed
  2. Configuration (transverse, short oblique, long onlique, comminuted)
  3. Location of the fracture within the bone
  4. Specific bone fractured
  5. Displacement and overriding

7

What are the types of implants (materials) used in fracture repair?

316 LVM Stainless Steel

Titanium Pure

8

Stiffness of a rod is _____.

radius to 4th power

9

Stiffness of a square beam is _____.

height to 3rd power

width to 1st power

10

Stiffness of a length of with beam is _____.

length to 3rd power

11

To use cerclage wire, fracture must be _____.

Long oblique

12

T/F: Cerclage wire can be used as the sole means of repair.

False

13

What size cerclage wire should be used in dogs vs. cats/toy breeds?

Dogs = 1-1.2mm (18-20G)

Cats/toy breeds = 0.64-0.81mm (20-22G)

14

___ or more circumferential cerclage wires must be used, placed _____ apart.

2, 8-10mm

15

Cerclage should be no closer than ____ from the fracture ends.

5mm

16

Cerclage wire must reside directly on _____ and confirmed to be _____.

bone, tight

17

The size of the intramedulary pin should be ___% the diameter of the _____ cavity.

50-75%, medullary

18

The intramedulary pin should be placed _____ when possible.

normograde

19

The intramedulary pin should be seated in the _____.

trans (far) epiphysis

20

The fixation construct of the intramedulary pin should counter _____, or _____ should be employed.

torsional stress, ancillary devices

21

If intramedulary pins are used in conjunction with plates, the size of the pin should be ____% the diameter of the _____.

30-50%, medullary cavity

22

The size of the dynamic compression plate used is dictated by the size of the _____ allowed.

screw

23

The major diameter of the screw used should approach but be no greater than ___% of the diameter of the bone being plated with a dynamic compression plate.

20%

24

Screws should engage at least ____ cortices on either side of a fracture when using a dynamic compression plate.

6

25

Screws shoud engage both _____ and _____ cortices when using a dynamic compression plate.

cis (near), trans (far)

26

When plating with a dynamic compression plate, the fracture should be _____ so that there is cortical-cortical contact (esp on the _____ cortex).

reduced, trans

27

The dynamic compression plate should be _____ so that it lies directly on the bone.

contoured

28

In dynamic compression plating, screws should be placed in _____ --- away from the fracture line in the _____.

"load position", dynamic compression hole

29

The size of the locking plate is dictated by the size of the _____ allowed.

screw

30

With a locking plate, the major diameter of the screw should approach, but be no greater than ___% of the diameter of the bone being plated.

20%