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Related Experiment Videos

Development of a perforated biodegradable interference screw.

Patrick Hunt1, Frank N Unterhauser, Michael J Strobel

  • 1Sports Traumatology and Arthroscopy Service, Trauma & Reconstructive Surgery, Charité, Campus Virchow-Clinic, Humboldt-University of Berlin, Berlin.

Arthroscopy : the Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association
|March 10, 2005
PubMed
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This study introduces a novel perforated biodegradable interference screw designed to improve bone integration. The new screw design enhances osseous integration without compromising stability during insertion, showing promising results for anterior cruciate ligament surgery.

Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Tissue Engineering

Background:

  • Biodegradable interference screws are crucial in anterior cruciate ligament (ACL) reconstruction.
  • Enhancing osseous integration of these screws can improve long-term graft stability and healing.
  • Current designs may have limitations in promoting rapid bone ingrowth.

Purpose of the Study:

  • To develop and evaluate a perforated biodegradable interference screw.
  • To assess if perforations enhance osseous implant integration.
  • To ensure screw stability during insertion is maintained.

Main Methods:

  • Biodegradable poly-(L-co-D,L-lactide) screws were manually perforated using spiral and parallel patterns.
  • Torsional mechanical testing was performed on perforated and unperforated screws.

Related Experiment Videos

  • A sheep model (n=12) was used to evaluate histological bone ingrowth into parallel perforated screws after 24 weeks.

    • Main Results:

    • Parallel perforated screws showed torsional strength comparable to unperforated controls, exceeding typical insertion torques.
    • Molded perforated screws retained 91% of the torsional strength of unperforated screws, ensuring surgical reliability.
    • Histological analysis confirmed significant bone ingrowth into the perforations of the screws, including the core.

    Conclusions:

    • Perforated, cage-like biodegradable interference screws show potential for accelerated osseous integration.
    • The novel design offers a low risk of screw breakage during surgical insertion.
    • This technology may enhance ossification at the implant site in ACL reconstruction.