External Fixation at Veterinärmedizinische Universität Wien | Flashcards & Summaries

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Lernmaterialien für External Fixation an der Veterinärmedizinische Universität Wien

Greife auf kostenlose Karteikarten, Zusammenfassungen, Übungsaufgaben und Altklausuren für deinen External Fixation Kurs an der Veterinärmedizinische Universität Wien zu.

TESTE DEIN WISSEN

What are the mechanical disadvantages of the location for pin placement in the mandibula?

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TESTE DEIN WISSEN

- Lies along the compression side of the bone

- Minimal medial-lateral width for pin purchase

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TESTE DEIN WISSEN

What are the advantages of external fixator over plating in the vertebral column (4)?

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TESTE DEIN WISSEN

- Application in a closed or open approach 

- frame outside the body + only pins traversing the area = smaller mass of implanted material and less trauma to soft tissues

- not rely on integrity of adjacent articular processes 

- can be combined with decompressive procedures

Lösung ausblenden
TESTE DEIN WISSEN

What is a SPIDER?

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TESTE DEIN WISSEN

secured pin intramedullary dorsal epoxy resin

 

Intramedullary pin placement + dorsal contouring of the pins

+ transtarsal full pin

Lösung ausblenden
TESTE DEIN WISSEN

Which structures should be avoid in pin placement in the mandibula (2)?

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TESTE DEIN WISSEN

- tooth roots in the alveolar bone

- neurovascular structures within mandibular canal

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TESTE DEIN WISSEN

What is the common complication in external fixator in the mandibula and what is the clinical relevance?

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TESTE DEIN WISSEN

Premature pin loosening 

=> typically incidental finding at time of implant removal

Lösung ausblenden
TESTE DEIN WISSEN

In which part is it possible to do a full pin fixation across both mandible  and why?

Lösung anzeigen
TESTE DEIN WISSEN

rostral portion of mandible

=> caudal: interference with intermandibular soft tissue structures + restriction of tongue movement

Lösung ausblenden
TESTE DEIN WISSEN

What is the difference in pins placement in meta-bones between proximally and distally from carpometacarpal or tarsometatarsal joints?

Lösung anzeigen
TESTE DEIN WISSEN

proximally: Meta-bones = parallel to each other 

=> secured with medial to laterally placed pins


distally : More arched relationship to each other

=> No more than 2 meta-bone with a single pin or wire

Lösung ausblenden
TESTE DEIN WISSEN

Why it is discouraged to put one pin in meta-bones II and IV to fix them together?

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TESTE DEIN WISSEN

Weight => convexity of meta-bones flattens => force abaxial met-bone to move dorsally => impinge against pin placed through III and IV

Lösung ausblenden
TESTE DEIN WISSEN

Where can the pins be placed in a mandibula?

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TESTE DEIN WISSEN

Ventral mandibular border

Lösung ausblenden
TESTE DEIN WISSEN

Name advantages of a positive threaded pin?

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TESTE DEIN WISSEN
  • increased pin stiffens (Area moment of inertia!) 
  • greater axial pull-out strength (pull out is determined by outer diameter!) 
  • greater fatigue life compared to smooth pins
Lösung ausblenden
TESTE DEIN WISSEN

Wghich type of fixator can be used in the mandibula and which material is preferred and why (5)?

Lösung anzeigen
TESTE DEIN WISSEN

- type Ia or modified type II 

- free-form acrylic 

=> Easy contouring, Ability to capture pins in different planes, Match the shape of the bone, Light, Easy to clean

Lösung ausblenden
TESTE DEIN WISSEN

What are the advantages (2) and disadvantages (2) of external fixation in the vertebral column?

Lösung anzeigen
TESTE DEIN WISSEN

- Removing of fixator

- Allow motion across disc spaces


- Exposure of external skeletal fixator (infection, trauma)

- In larger dogs: greater muscle mass => ↑ stress on pin and pin-bone interface because longer working lengths of the pin =>↑ risk premature pin loosening

Lösung ausblenden
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Q:

What are the mechanical disadvantages of the location for pin placement in the mandibula?

A:

- Lies along the compression side of the bone

- Minimal medial-lateral width for pin purchase

Q:

What are the advantages of external fixator over plating in the vertebral column (4)?

A:

- Application in a closed or open approach 

- frame outside the body + only pins traversing the area = smaller mass of implanted material and less trauma to soft tissues

- not rely on integrity of adjacent articular processes 

- can be combined with decompressive procedures

Q:

What is a SPIDER?

A:

secured pin intramedullary dorsal epoxy resin

 

Intramedullary pin placement + dorsal contouring of the pins

+ transtarsal full pin

Q:

Which structures should be avoid in pin placement in the mandibula (2)?

A:

- tooth roots in the alveolar bone

- neurovascular structures within mandibular canal

Q:

What is the common complication in external fixator in the mandibula and what is the clinical relevance?

A:

Premature pin loosening 

=> typically incidental finding at time of implant removal

Mehr Karteikarten anzeigen
Q:

In which part is it possible to do a full pin fixation across both mandible  and why?

A:

rostral portion of mandible

=> caudal: interference with intermandibular soft tissue structures + restriction of tongue movement

Q:

What is the difference in pins placement in meta-bones between proximally and distally from carpometacarpal or tarsometatarsal joints?

A:

proximally: Meta-bones = parallel to each other 

=> secured with medial to laterally placed pins


distally : More arched relationship to each other

=> No more than 2 meta-bone with a single pin or wire

Q:

Why it is discouraged to put one pin in meta-bones II and IV to fix them together?

A:

Weight => convexity of meta-bones flattens => force abaxial met-bone to move dorsally => impinge against pin placed through III and IV

Q:

Where can the pins be placed in a mandibula?

A:

Ventral mandibular border

Q:

Name advantages of a positive threaded pin?

A:
  • increased pin stiffens (Area moment of inertia!) 
  • greater axial pull-out strength (pull out is determined by outer diameter!) 
  • greater fatigue life compared to smooth pins
Q:

Wghich type of fixator can be used in the mandibula and which material is preferred and why (5)?

A:

- type Ia or modified type II 

- free-form acrylic 

=> Easy contouring, Ability to capture pins in different planes, Match the shape of the bone, Light, Easy to clean

Q:

What are the advantages (2) and disadvantages (2) of external fixation in the vertebral column?

A:

- Removing of fixator

- Allow motion across disc spaces


- Exposure of external skeletal fixator (infection, trauma)

- In larger dogs: greater muscle mass => ↑ stress on pin and pin-bone interface because longer working lengths of the pin =>↑ risk premature pin loosening

External Fixation

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