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3D digital image correlation evaluation of arthrodesis implants.

Victor ChuYu Shen1, Clifton H Bumgardner1, Lisa Actis2

  • 1University of Virginia, Department of Mechanical and Aerospace Engineering, 122 Engineer's Way, Charlottesville, VA 22903, USA.

Clinical Biomechanics (Bristol, Avon)
|November 4, 2019
PubMed
Summary

Nitinol staples and locking plates used in Hallux Valgus surgery showed different biomechanical properties. Nitinol staples better recover compression after loading, suggesting potential for early weight-bearing protocols.

Keywords:
BiomechanicsHallux disorders

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Materials science

Background:

  • Hallux valgus is a common foot deformity often treated with the Lapidus procedure.
  • Understanding bone and implant biomechanics is crucial for effective surgical outcomes.

Purpose of the Study:

  • To investigate the biomechanical characteristics of bone, implant devices, and their interface.
  • To compare the performance of nitinol staples and locking plates in a Hallux valgus model.

Main Methods:

  • Utilized in-situ digital image correlation on polyurethane foam bone substitute.
  • Developed a modified three-point bend test frame for enhanced mechanical characterization.
  • Tested nitinol staples and locking plates in a simulated 1st tarsometatarsal joint model.

Main Results:

  • Digital image correlation identified maximum strain concentrations of 1.5% at bone-implant interfaces.
  • Locking plates and nitinol staples gapped 2.2 mm and 3.2 mm respectively under 50 N load.
  • Residual gapping after unloading was 0.8 mm for locking plates and 0.3 mm for nitinol staples.

Conclusions:

  • Locking plates offer superior initial stability but nitinol staples demonstrate better compression recovery under cyclic loading.
  • Nitinol staple technology may offer advantages for early weight-bearing protocols post-Hallux valgus surgery.