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Ballistic Gels in Experimental Fracture Setting.

Christoph Biehl1,2, Ann-Cathrin Thiesse-Kraul2, Sabine Stötzel2

  • 1Department of Trauma, Hand and Reconstructive Surgery, Faculty of Medicine, Justus-Liebig-University of Giessen, 35392 Giessen, Germany.

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This study optimized ballistic gel for bone biomechanical testing, mimicking sheep muscle for reproducible fall impact analysis. The new gel enhances bone stability and storage, reducing variability in fracture research.

Keywords:
ballistic gelbiomechanical testingfracture modelpressure loads

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Area of Science:

  • Biomechanical Engineering
  • Materials Science
  • Orthopedic Research

Background:

  • Traditional biomechanical tests often focus on bending, compression, or shear, with fall tests being less common due to reproducibility challenges.
  • Simulating in-vivo conditions for bone fall impact testing is difficult due to soft tissue variability and reduced bone strength upon explantation.
  • Ballistic gels offer potential for stabilizing specimens and simulating soft tissue but lack standardization in biomechanical studies.

Purpose of the Study:

  • To optimize a ballistic gel formulation that accurately mimics the biomechanical properties of sheep upper thigh muscle.
  • To establish a standardized and reproducible method for bone biomechanical testing, particularly for fall impact scenarios.
  • To evaluate the stability and storage capabilities of bone specimens embedded in the optimized ballistic gel.

Main Methods:

  • Developed and tested various agarose and gelatin mixtures to achieve a consistency comparable to sheep gluteal muscle.
  • Conducted compression tests on cylindrical muscle samples to establish target biomechanical properties.
  • Assessed the stability of bone specimens within the optimized ballistic gel through freeze-thaw cycles (-20 °C to +20 °C).

Main Results:

  • An optimal ballistic gel composition of 29.5% gelatin and 0.35% agarose was identified, effectively mimicking muscle consistency.
  • Bones embedded in the optimized gel remained stable throughout multiple freeze-thaw cycles, indicating good storage potential.
  • The ballistic gel method demonstrated reduced variability compared to testing with intact muscle tissue.

Conclusions:

  • The developed ballistic gel provides a standardized, reproducible, and cost-effective medium for bone biomechanical testing, especially for fall impact simulations.
  • This method enhances specimen stability, improves storage quality, and allows for repeated measurements on the same bone sample.
  • The optimized gel is suitable for bone fracture models, offering simultaneous fracture fixation and muscle-like strength for more consistent experimental outcomes.