External Fixation- Rings Flashcards Preview

Biomechanics & Surgery Exam 3 > External Fixation- Rings > Flashcards

Flashcards in External Fixation- Rings Deck (11):
1

what are the indications for external ring fixation?

-aucte trauma: fx,
-reconstructive surgeries: Charcot, arthrodesis

2

how is stability created in circular fixators?

tensioned wires that are inserted into bone

3

how is rigidity created in circular fixators?

half pins that are screwed into bone

4

what are wires for? what are pins for?

wires- for stability
pins- for rigidity

5

what is the optimal position of wires?

have 2 wires 90 deg to each other

6

where do axial wires insert thru?

tibia, calcaneus, and metatarsal bases

7

which wires are put under the most tension?

tibial wires (1000-1200N)
*then hindfoot wires (800N), then forefoot wires (600N)

8

which wires are put under the most tension?

tibial wires (1000-1200N)
*then hindfoot wires (800N), then forefoot wires (600N)

9

what is dynamization?

release of tension from the wires; allows the bone to strengthen after a period of immobilization

10

what are some minor complications with external fixation?

-edema
-pin tract irritation
-pin tract infection
-fractured transosseous wires
-pain secondary to positioning of the wires

11

what are some major complications with external fixation?

1. non-union
2. osteomyelitis
3. neurovascular injury
4. joint subluxation
5. fracture