Felis ISSN 2398-2950

Fracture fixation: lag screw

Synonym(s): ASIF, bone screw

Contributor(s): James Cook, Susan Rackard, J Yovich

Introduction

  • To stabilize a fracture using stainless steel bone screws providing interfragmental compression until healing is complete.
  • Two types of bone screw are available:
    • Cortex - for use in cortical bone of diaphysis.
    • Cancellous - for use in bone of metaphysis and epiphysis.
  • Generally used in conjunction with a bone plate Fracture fixation: plate or external fixation Fracture: external fixation to protect the interfragmental compression achieved.
  • See also internal fracture fixation Fracture: internal fixation.

Uses

  • Oblique or spiral fractures of diaphysis Fracture distal radius and ulna 01: repair with screw - radiograph  Antebrachium: fracture 01 - radiograph lateral .
  • Comminuted fractures.
  • Epiphyseal fractures.
  • Sacroiliac luxations Sacroiliac luxation: repair.

Advantages

  • Provides compression at fracture site.

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


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