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Trinion meniscal screw.

F Alan Barber1, Morley A Herbert

  • 1Plano Orthopedic and Sports Medicine Center, Plano, Texas 75093, USA.

Arthroscopy : the Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association
|June 10, 2006
PubMed
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The Trinion meniscal screw, an all-inside meniscus repair device, demonstrated a mean load to failure of 38.9 N in vitro. Failure modes were consistent with similar devices, indicating potential clinical relevance.

Area of Science:

  • Orthopedic surgery
  • Biomaterials science
  • Biomechanics

Background:

  • All-inside meniscal repair devices offer advantages like no accessory incisions and faster procedures.
  • These devices are increasingly utilized in orthopedic practice for meniscus tears.
  • Understanding the biomechanical properties of new devices is crucial for clinical application.

Purpose of the Study:

  • To evaluate the in vitro load to failure strength of a new all-inside meniscal repair device, the Trinion meniscal screw.
  • To characterize the failure modes of the Trinion meniscal screw under mechanical stress.
  • To compare the biomechanical performance of the Trinion screw with existing meniscal repair devices.

Main Methods:

  • Fifteen porcine menisci were subjected to a standardized vertical longitudinal tear (3 mm from periphery).

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  • Each tear was repaired using a single 10-mm Trinion meniscal screw.
  • Repaired menisci were tested to failure using loads parallel to the repair axis, with load to failure and failure modes recorded.

    • Main Results:

    • The mean load to failure for the Trinion meniscal screw was 38.9 N (SD ± 9.04 N), with a range of 23.1 to 55.2 N.
    • Two primary failure modes were observed: pull-out of the inner screw piece (6/15) and pull-out from the outer (peripheral) rim (9/15).
    • No device breakage occurred during testing.

    Conclusions:

    • The Trinion meniscal screw exhibits a load to failure strength comparable to other tested all-inside meniscal repair devices.
    • The observed failure mechanisms align with those seen in other all-inside meniscal repair systems.
    • While material properties and in vitro strength are important, they may not directly predict clinical outcomes in meniscal repair.