Characterization of polyurethane-based synthetic vertebrae for spinal cement augmentation training

Marianne Hollensteiner, Melanie Botzenmayer, David Fürst, Martin Winkler, Peter Augat, Sabrina Sandriesser, Falk Schrödl, Benjamin Esterer, Stefan Gabauer, Klaus Püschel, Andreas Schrempf

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Vertebral augmentation techniques are used to stabilize impacted vertebrae. To minimize intraoperative risks, a solid education of surgeons is desirable. Thus, to improve education of surgeons as well as patient safety, the development of a high-fidelity simulator for the surgical training of cement augmentation techniques was initiated. The integrated synthetic vertebrae should be able to provide realistic haptics during all procedural steps. Synthetic vertebrae were developed, tested and validated with reference to human vertebrae. As a further reference, commercially available vertebrae surrogates for orthopedic testing were investigated. To validate the new synthetic vertebrae, characteristic mechanical parameters for tool insertion, balloon dilation pressure and volume were analyzed. Fluoroscopy images were taken to evaluate the bone cement distribution. Based on the measurement results, one type of synthetic vertebrae was able to reflect the characteristic parameters in comparison to human vertebrae. The different tool insertion forces (19.7 ± 4.1, 13.1 ± 0.9 N, 1.5 ± 0.2 N) of the human reference were reflected by one bone surrogate (11.9 ± 9.8, 24.3 ± 3.9 N, 2.4 ± 1.0 N, respectively). The balloon dilation pressure (13.0 ± 2.4 bar), volume (2.3 ± 1.5 ml) of the synthetic vertebrae were in good accordance with the human reference (10.7 ± 3.4 bar, 3.1 ± 1.1 ml). Cement application forces were also in good accordance whereas the cement distribution couldn’t be reproduced accurately. Synthetic vertebrae were developed that delivered authentic haptics during transpedicular instrument insertion, balloon tamp dilation and bone cement application. The validated vertebra model will be used within a hybrid simulator for minimally invasive spine surgery to educate and train surgeons.

Original languageEnglish
Article number153
JournalJournal of Materials Science: Materials in Medicine
Volume29
Issue number10
DOIs
Publication statusPublished - 1 Oct 2018

Keywords

  • Biomechanical Phenomena
  • Bone Cements/chemistry
  • Bone Substitutes/chemistry
  • Female
  • Humans
  • Injections
  • Kyphoplasty
  • Lumbar Vertebrae/chemistry
  • Minimally Invasive Surgical Procedures
  • Needles
  • Polyurethanes/chemistry
  • Spinal Fractures/surgery

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