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Modeling stability post zygomatic fracture reconstruction.

Hanieh Arjmand1, Jeffrey A Fialkov2, Cari M Whyne3

  • 1Orthopaedic Biomechanics Lab, Sunnybrook Research Institute, Canada; Institute of Biomedical Engineering, University of Toronto, Canada.

Journal of Plastic, Reconstructive & Aesthetic Surgery : JPRAS
|March 1, 2024
PubMed
Summary
This summary is machine-generated.

Zygomaticomaxillary complex (ZMC) fracture repair may not require three-point fixation. Finite element modeling suggests two-point fixation provides biomechanical stability similar to intact bone, potentially reducing complications from excessive hardware.

Keywords:
Computational modelingCraniomaxillofacial skeletonFinite elementZygomaticomaxillary complex fracture

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Area of Science:

  • Biomechanical Engineering
  • Craniomaxillofacial Surgery
  • Trauma Management

Background:

  • Zygomaticomaxillary complex (ZMC) fractures are common in craniomaxillofacial trauma.
  • Current fixation methods often use three-point fixation with miniplates and screws, risking hardware complications.
  • Previous studies suggest less fixation may suffice, but biomechanical evidence is limited.

Purpose of the Study:

  • To investigate the biomechanical stability of ZMC fracture fixation using one, two, or three-point fixation.
  • To compare the mechanical behavior of the fractured craniomaxillofacial skeleton (CMFS) under different fixation scenarios using finite element modeling.
  • To provide evidence regarding the necessity of traditional three-point fixation for ZMC fractures.

Main Methods:

  • Utilized a validated finite element modeling approach with detailed bone and muscle representation.
  • Simulated mechanical behavior of the CMFS under one, two, and three-point ZMC fixation.
  • Analyzed strain and load transfer patterns across different fixation configurations.

Main Results:

  • Three-point fixation with an infraorbital rim miniplate increased strain and load transfer to that region.
  • Two-point fixation (zygomaticomaxillary and zygomaticofrontal) demonstrated strain patterns closest to the intact CMFS.
  • One-point fixation showed increased tensile and compressive strains in specific regions, including the zygomatic arch and body.

Conclusions:

  • The study provides biomechanical evidence against over-engineering in facial fracture stabilization.
  • Less than three-point fixation, particularly two-point fixation, may be adequate for ZMC fracture healing.
  • Findings support reconsidering conventional fixation strategies to potentially minimize hardware-related complications.