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Related Experiment Videos

Is there a mechanical difference between lag screws and double cerclage?

T E Kanakis1, J Cordey

  • 1Second Orthopaedic Clinic of Venizelion General Hospital, Iraklion, Crete, Greece.

Injury
|May 1, 1991
PubMed
Summary

Double cerclage wire fixation offers superior mechanical stability for comminuted long bone fractures compared to lag screws, particularly under torque. This study compared fixation methods in plastic tibia models.

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Trauma research

Background:

  • Comminuted long bone fractures pose significant mechanical instability challenges.
  • Standard osteosynthesis often requires supplementary fixation techniques.
  • Comparing lag screws and cerclage wire for enhanced fracture stability is crucial.

Purpose of the Study:

  • To compare the mechanical stability of lag screws versus cerclage wire as supplementary fixation for comminuted long bone fractures.
  • To evaluate the efficacy of different osteosynthesis combinations under torsional and axial loads.
  • To determine the optimal supplementary fixation method for improving fracture stability.

Main Methods:

  • Utilized 60 plastic tibia models with standard midshaft butterfly fractures.

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  • Applied a plate and six screws as the main osteosynthesis in all models.
  • Compared three groups: lag screws only, lag screws with double cerclages, and double cerclages only, testing under torque and axial load.

    • Main Results:

    • Group A1 (lag screws only) demonstrated the highest instability under torque.
    • Groups A2 (lag screws and cerclages) and A3 (cerclages only) showed significantly greater stability than A1 under torque.
    • Under axial load, Group A3 (cerclages only) was significantly more stable than Group A2, with no significant difference between A1 and A3.

    Conclusions:

    • Double cerclage wire, when properly tensioned and anchored, provides superior torsional stability compared to lag screws.
    • Both lag screws and double cerclage exhibit comparable stability under axial loading conditions.
    • The findings suggest double cerclage wire is a more effective supplementary fixation for improving torsional stability in comminuted long bone fractures.