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Suture anchor strength revisited

F A Barber1, M A Herbert, J N Click

  • 1Orthopedic and Sports Medicine Center, Plano, Texas 75075, USA.

Arthroscopy : the Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association
|February 1, 1996
PubMed
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This study tested the pullout strength of eight new suture anchors in porcine femurs. Screw anchors showed increased strength with larger diameters, while non-screw anchors performed worse with larger drill holes.

Area of Science:

  • Orthopedic Surgery
  • Biomechanical Engineering
  • Materials Science

Background:

  • Suture anchors are increasingly used in orthopedic procedures.
  • Previous research has evaluated the pullout strength of various suture anchors.
  • Comparative data on the performance of newer anchor designs is essential for clinical decision-making.

Purpose of the Study:

  • To evaluate and compare the pullout strength and failure modes of eight additional suture anchors.
  • To statistically compare the performance of these new anchors with previously tested devices.
  • To assess the influence of insertion hole size on anchor performance.

Main Methods:

  • Ten samples of each of eight suture anchors were tested in a porcine femur model.
  • Anchors were inserted into diaphyseal cortex, metaphyseal cortex, and a cancellous trough.

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  • Tensile stress was applied parallel to the insertion axis until failure, with mean failure strengths calculated.

    • Main Results:

    • Failure modes were consistent for each anchor type (pullout, eyelet cutout, or wire breakage).
    • For screw anchors, larger minor diameters correlated with higher mean failure strengths across all tested areas (P = .001).
    • Larger drill holes for non-screw anchors led to lower mean failure strengths in cancellous bone (P = .03) and diaphyseal cortex (P < .005).

    Conclusions:

    • Anchor performance is significantly influenced by the size of the insertion hole.
    • Screw anchor strength increases with minor diameter, offering a potential advantage.
    • Non-screw anchors may be compromised by larger drill holes, particularly in bone with lower density.