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Related Experiment Videos

Efficacy of bone staples for fixation.

W L Bargar1, N A Sharkey, H A Paul

  • 1Orthopaedic Research Laboratories, University of California, Davis.

Journal of Orthopaedic Trauma
|January 1, 1987
PubMed
Summary

Bone staples were tested in dogs, showing staple A had better displacement and work to failure than staple B. However, both bone staples were inferior to screws for fixation strength.

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Area of Science:

  • Orthopedic surgery
  • Biomaterials science
  • Veterinary orthopedics

Background:

  • Bone staples are used for fracture fixation and tendon reattachment.
  • Evaluating implant performance in animal models is crucial for clinical translation.
  • Comparing different fixation devices informs surgical choices.

Purpose of the Study:

  • To compare the pull-out strength of two bone staple types (Techmedica A, Richards B) against a cancellous bone screw.
  • To assess the effectiveness of these staples for patellar tendon reattachment in a canine model.

Main Methods:

  • Canine model utilizing lateral femoral condyle, proximal humerus, and tibial tubercle.
  • Implants placed at two time points; animals euthanized at 6 weeks.
  • Pull-out strength, displacement to failure, and work to failure measured for bone staples and screws.

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  • Patellar tendon reattachment strength compared to intact tendons.

    • Main Results:

    • No statistical difference in pull-out load between staple A and staple B.
    • Staple A demonstrated significantly greater displacement (71%) and work to failure (128%) than staple B.
    • Both staples were inferior to the bone screw in pull-out load, displacement, and work to failure (p < 0.0001).
    • Reattached tendons were significantly weaker (202 N) than intact tendons (1,448 N).
    • Tendon necrosis under implants and healing by scar formation were observed.

    Conclusions:

    • Staple A may offer improved resistance to back-out compared to staple B.
    • Bone screws provide superior fixation strength compared to both tested staples.
    • Current staple fixation methods result in significantly weaker tendon reattachments and potential tissue necrosis.