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Related Experiment Videos

Three-dimensional load measurements in an external fixator.

K Seide1, N Weinrich, M E Wenzl

  • 1Berufsgenossenschaftliches Unfallkrankenhaus (Trauma Hospital) Hamburg, Bergedorfer Strasse 10, 21033 Hamburg, Germany. k.seide@buk-hamburg.de

Journal of Biomechanics
|July 28, 2004
PubMed
Summary

This study developed a novel hexapod external fixator system to measure forces and moments during fracture healing. The system accurately monitors healing progress and fracture types, potentially reducing radiation exposure.

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Biomechanics

Background:

  • External fixators are crucial for fracture management.
  • Accurate in vivo load monitoring is essential for optimizing fracture healing.
  • Current methods for assessing fracture healing can be limited.

Purpose of the Study:

  • To develop and evaluate a six-degree-of-freedom hexapod external fixator system for in vivo measurement of axial and shear forces, torsion, and bending moments.
  • To assess the system's ability to determine fracture type and monitor the healing process.
  • To explore the potential for automatic adjustments and patient guidance in external fixation.

Main Methods:

  • Development of a hexapod external fixator with integrated sensors for measuring all six degrees of freedom.

Related Experiment Videos

  • Pilot study involving 9 patients with tibia fractures or osteotomies.
  • In vivo load measurements taken at 2, 4, 8, 12 weeks, and at fixator removal.

    • Main Results:

    • The system successfully measured forces and moments, differentiating between fracture types (e.g., A3, A2, B2, C3).
    • Axial forces decreased over healing as bone load transfer increased.
    • Bending moments correlated well with clinical healing, except in C3 fractures.
    • A combination of bending moment and axial force effectively assessed fracture healing.
    • Bone resorption in transverse fractures was detected at approximately 4 weeks.

    Conclusions:

    • The hexapod system enables separate measurement of all forces and moments with a simple mechanical setup.
    • This system can control fracture healing, potentially reducing radiographic exposure.
    • It represents a step towards "automatic dynamization" and "intelligent fixators" for optimized patient outcomes.