Fracture biomechanics and classification Flashcards Preview

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Flashcards in Fracture biomechanics and classification Deck (29):
1

What are the four forces on a fracture

bending
torsion
compression
tension

2

What kind fo fracture is compression a good thing for?

A well reduced transverse fracture

3

What happens with compression on a oblique fracture?

Shearing

4

What 2 other forces do we see added during bending and where?

Inherently when something bends, one cortices will undergo compression and one cortices will undergo tension

5

What is the neutral axis?

The point in a bending bone that sees no compressive or tensive forces

6

If you fix a broken bone with an IM pin you want it to run where?

Down the neutral axis

7

Torsion is essentially?

Rotation

8

Tensions causes what phenomena?

Distraction

9

Casts and splints are good at neutralizing?

Bending and are ok at torsion

10

Wires are good at neutralizing?

Tension, that is all

11

Intramedullary pins are good at neautralizing?

bending, bad at all other forces

12

Interlocking nails are good at controlling?

All forces

13

External skeletal fixation is good at controlling?

All forces

14

Bone plates are good at controlling?

all forces but are weakest at bending combined with compression

15

2 ways to describe a fracture with soft tissue damage respect

Closed
Open

16

5 ways to describe fractures with regards to cortical disruption

Greenstick
Fissure
Saucer
Complete
Depression

17

Describe a greenstick fracture

cortex doesn't break all the way through

18

Describe a fissure

Crack only involving one side of the bone

19

4 ways to describe a fracture with respect to geometry

Transverse
Oblique
spiral
Comminuted

20

2 types of oblique fracture

Long
short

21

4 types of comminuted fractures

butterfly
highly comminuted
segmental
multiple

22

What is the name of the property bone has that means faster or higher energy impacts cause sharding

Viscoelastic nature of bone

23

5 ways to describe a fracture with respect to location within a bone

articular
physeal
metaphyseal
diaphyseal
condylar

24

5 ways to describe a fracture with respect to location within a bone

articular
physeal
metaphyseal
diaphyseal
condylar

25

What does a non displaced fracture suggest?

Intact periosteal sleeve

26

Always describe displacement with regards to which bone piece?

Distal fragment

27

4 causes of bone fractures?

Traumatic
Pathologic
Fatigue
Iatrogenic

28

2 types of traumatic forces causing bone fractures

Direct (outside)
indirect (action of animals own muscles)

29

Order of fractures description goes?

open/closed
geometry
Cortical disruption/completeness
location on the bone
displacement