Canis ISSN: 2398-2942

Fracture fixation: lag screw

Synonym(s): ASIF bone screw

Contributor(s): Susan Rackard

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

Requirements

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Preparation

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Procedure

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Aftercare

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Outcomes

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Prognosis

  • Good when correctly inserted.

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.


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