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Veterinary surgery : VS2010; 39(5); 601-608; doi: 10.1111/j.1532-950X.2010.00707.x

In vitro mechanical evaluation of a novel pin-sleeve system for external fixation of distal limb fractures in horses: a proof of concept study.

Abstract: To evaluate the efficacy of a novel pin-sleeve cast (PSC) system for external fixation of distal limb fractures in horses and to compare it with the transfixation pin cast (TPC) system. Methods: Experimental. Methods: One bone substitute each was used for the TPC and PSC systems. The PSC was tested in 4 configurations characterized by different pin preloads. Methods: Specimens were loaded in axial compression in the elastic range. Variables compared statistically were: bone substitute axial displacement and axial strain measured above implants with strain gauges. Pin preload was correlated with the variables investigated. Load to failure and a fatigue tests supplemented the investigation. Results: The PSC configuration with the highest pin preload showed a significantly lower axial displacement compared with the TPC. No significant differences were observed between all other PSC configurations and the TPC. All PSC systems had a significant decrease in recorded strain compared with the TPC system. Pin axial preload inversely correlated with axial displacement but had no effect on axial strain. In the failure test, the PSC encountered plastic deformation earlier than the TPC. In the fatigue test, the PSC ran >200,000 cycles. Conclusions: Preliminary in vitro tests showed that the PSC system significantly reduced peri-implant strain while concurrently having comparable axial displacement to the TPC system. Conclusions: The PSC system has the potential to reduce the risk of pin loosening in horses.
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Publication Date: 2010-06-18 PubMed ID: 20561322DOI: 10.1111/j.1532-950X.2010.00707.xGoogle Scholar: Lookup
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  • Comparative Study
  • Evaluation Study
  • Journal Article

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This research investigated a new system known as the pin-sleeve cast (PSC) for the external fixation of distal limb fractures in horses, and compared its effectiveness to the existing transfixation pin cast (TPC) system. The study found that the PSC had advantages over the TPC and could potentially lower the risk of pin loosening in horses.

Experiment

  • The researchers performed an in vitro experiment, using bone substitutes and testing both the TPC and PSC systems.
  • The PSC system was tested in four different configurations, which had different pin preloads.
  • The specimens were subjected to axial compression in the elastic range.
  • The study took into account multiple factors for comparison including axial displacement and strain measured above the implants using strain gauges.
  • Pin preload was correlated with the variables under investigation. Supplementary tests to determine the maximum load to failure and fatigue were also conducted.

Findings

  • The results showed that the PSC system with the highest pin preload displayed significantly less axial displacement when compared with the TPC system. There were no significant differences between other PSC configurations and the TPC.
  • The PSC system demonstrated reduction in recorded strain than the TPC system.
  • The study noted a negative correlation between pin axial preload and axial displacement, but found no effect on axial strain.
  • During the failure test, it was observed that the PSC system encountered plastic deformation earlier than the TPC system.
  • In the fatigue test, the PSC system was able to run more than 200,000 cycles.

Conclusions

  • The preliminary in vitro test results demonstrated that the PSC system was useful in significantly reducing peri-implant strain, while simultaneously showing comparable axial displacement to the TPC system.
  • The researchers concluded that the PSC system could hold potential in reducing the risk of pin loosening in horses suffering from distal limb fractures.

Cite This Article

APA
Brianza S, Brighenti V, Boure L, Sprenger V, Pearce S, Schwieger K. (2010). In vitro mechanical evaluation of a novel pin-sleeve system for external fixation of distal limb fractures in horses: a proof of concept study. Vet Surg, 39(5), 601-608. https://doi.org/10.1111/j.1532-950X.2010.00707.x

Publication

Veterinary surgery : VS
ISSN: 1532-950X
NlmUniqueID: 8113214
Country: United States
Language: English
Volume: 39
Issue: 5
Pages: 601-608

Researcher Affiliations

Brianza, Stefano
  • AO Research Institute, 7270 Davos Platz, Switzerland. stefano.brianza@aofoundation.org
Brighenti, Vittoria
    Boure, Ludovic
      Sprenger, Victor
        Pearce, Simon
          Schwieger, Karsten

            MeSH Terms

            • Animals
            • Biomechanical Phenomena
            • Bone Nails / veterinary
            • External Fixators / veterinary
            • Fractures, Bone / surgery
            • Fractures, Bone / veterinary
            • Horse Diseases / surgery
            • Horses / surgery
            • In Vitro Techniques
            • Stress, Mechanical
            • Weight-Bearing

            Citations

            This article has been cited 1 times.
            1. Lozier JW, Niehaus AJ, Muir A, Lakritz J. Short- and long-term success of transfixation pin casts used to stabilize long bone fractures in ruminants. Can Vet J 2018 Jun;59(6):635-641.
              pubmed: 29910478
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