Fracture fixation: lag screw in Dogs (Canis) | Vetlexicon
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Fracture fixation: lag screw

ISSN 2398-2942

Contributor(s) :


Synonym(s): ASIF bone screw

Introduction

  • To stabilize a fracture using stainless steel bone screws providing interfragmentary compression until healing is complete.
  • Two types of bone screw are available:
    • Cortical - for use in cortical bone of diaphysis.
    • Cancellous - for use in bone of metaphysis and epiphysis.
    • Partially or fully threaded.

Uses

  • → Oblique or spiral fractures of diaphysis.
  • → Comminuted fractures.
    Interfragmentary compression achieved by lag screw fixation requires protection from the forces which act on the long bone. This is achieved by use of a neutralization plate or external skeletal fixation in conjunction with lag screw fixation.
  • → Epiphyseal fractures.

Advantages

Disadvantages

Alternative techniques

Time required

Preparation

  • 15 min.

Procedure

  • 30 min (dependent upon fracture severity and ease of exposure).

Decision taking

Criteria for choosing test

  • Pre-operative radiographical evidence of type, nature and position of fracture is essential.

Risk assessment

  • General anesthesia is essential for both radiography and subsequent reduction of fracture and casting - patient should be stabilized and other injuries assessed/treated prior to treating fractures.

Requirements

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Preparation

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Technique

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Aftercare

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Outcomes

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Further Reading

Publications

Refereed papers

  • Recent references from PubMed and VetMedResource.
  • Gilmore D R (1983) Application of a lag screw. Comp Contin Educ Pract Vet 5, 217-223.