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Related Experiment Videos

Ultrasonically implanted PLA suture anchors are stable in osteopenic bone.

D C Meyer1, J Mayer, U Weber

  • 1Department of Orthopaedics, University of Zürich, Switzerland.

Clinical Orthopaedics and Related Research
|January 6, 2006
PubMed
Summary

A new absorbable polylactic pin anchor demonstrated comparable pullout strength to a metallic Corkscrew anchor across various bone densities. This finding is crucial for rotator cuff repair in diverse patient bone quality.

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Biomechanics

Background:

  • Rotator cuff tears often require surgical repair using suture anchors.
  • Metallic suture anchors are commonly used, but concerns exist regarding their long-term presence and potential complications.
  • Absorbable anchors offer a potential alternative, but their biomechanical performance, especially in varying bone quality, needs thorough evaluation.

Purpose of the Study:

  • To compare the in vitro pullout strength of a novel ultrasonically implanted absorbable polylactic pin with a standard metallic screw-type suture anchor (Corkscrew).
  • To assess the influence of humeral head bone density on the fixation strength of both anchor types.

Main Methods:

  • Cadaveric humeral heads with varying bone densities were used for in vitro testing.

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  • Microcomputed tomography (micro-CT) was employed for quantitative assessment of bone density.
  • Pullout tests were performed at standardized sites to measure the fixation strength of the metallic Corkscrew and the absorbable polylactic pin.
  • Pullout strength data were correlated with local bone density measurements.

    • Main Results:

    • The 5-mm Corkscrew and 3.5-mm polylactic pin exhibited similar mean pullout strengths across weak, intermediate, and strong bone densities.
    • Pullout strength for both implants showed a strong positive correlation with bone density (r = 0.76 for Corkscrew, r = 0.86 for polylactic pin).
    • The absorbable polylactic pin achieved comparable fixation strength to the larger metallic Corkscrew, even in low bone density conditions.

    Conclusions:

    • The ultrasonically implanted absorbable polylactic pin provides reliable fixation comparable to a metallic anchor in the humeral head.
    • Bone density is a critical factor influencing suture anchor pullout strength in rotator cuff repairs.
    • This absorbable anchor represents a promising alternative for rotator cuff repair, particularly in patients with compromised bone quality.