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Related Experiment Videos

External skeletal fixation: choosing a system based on biomechanical stability.

T K Moroz1, J B Finlay, C H Rorabeck

  • 1Orthopaedic Research Laboratory, University of Western Ontario, University Hospital, London, Canada.

Journal of Orthopaedic Trauma
|January 1, 1988
PubMed
Summary

This study evaluated external fixator biomechanical stability for long-bone fractures. RxFx, AO, and Orthofix systems demonstrated superior stability compared to Brooker and Hoffman, with double and stacked frames being more robust.

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Area of Science:

  • Orthopedics
  • Biomedical Engineering
  • Materials Science

Background:

  • External fixators are increasingly popular for long-bone fracture treatment.
  • Selecting the appropriate fixation device requires understanding its biomechanical performance under anticipated loading conditions.
  • Various external fixation systems are available, necessitating comparative analysis of their stability.

Purpose of the Study:

  • To compare the biomechanical stability of different external fixator half-frame configurations.
  • To evaluate rigidity, yield-load, failure-load, and load causing 1 mm displacement under various loading conditions.
  • To analyze the slippage tolerance of universal joint and clamp interfaces.

Main Methods:

  • Five external fixation systems were tested using standardized acrylic rod models with a midshaft saw-cut.

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  • Tests included axial compression, torsion, and anterior-posterior/medial-lateral bending.
  • Half-frames were configured as single, double, and stacked units, with standardized dimensions and tightening torques.

    • Main Results:

    • RxFx, AO, and Orthofix fixators generally exhibited greater biomechanical stability than Brooker and Hoffman systems.
    • Single half-frames, except for the Orthofix system, showed significant weakness.
    • Double and stacked half-frame configurations demonstrated enhanced stability across all tested systems.

    Conclusions:

    • The choice of external fixation system significantly impacts biomechanical stability for long-bone fracture treatment.
    • RxFx, AO, and Orthofix systems offer superior stability compared to Brooker and Hoffman.
    • Configuration of the half-frame (single, double, or stacked) is critical for achieving adequate stability, with multi-frame constructs being more robust.