Determination of fixation strength of large-diameter interference screws

Leslie S. Matthews, Brent G. Parks, Ronald C. Sabbagh

Research output: Contribution to journalArticlepeer-review


Small-diameter interference screws are a widely used method of securing bone-tendon grafts during anterior cruciate ligament reconstructive procedures. Recent reports document tunnel widening and subsequent loss of fixation, leading to a need for alternative fixation methods. In cadaver tissue, the fixation strength of large-diameter (11-, 13-, and 15-mm) interference screws was tested and compared with that of clinically used 9-mm diameter screws. Patellar-tendon sections were fashioned into three grafts, each with bone plugs measuring 10 X 20 X 7.5 mm. Tunnels were created in the epiphyseal bone of the femurs and tibias, resulting in gap sizes of 4.5-, 6.5-, 8.5-, and 10.5-mm for the 9-, 11-, 13-, and 15-mm diameter screws, respectively. Grafts were pulled from the tunnel at a rate of 51 cm/min. Average fixation strengths were 276, 302, 328, and 328 N for the 9-, 11-, 13-, and 15-mm screws, respectively. No significant difference existed between the fixation strengths (ANOVA, P ≤ .05).

Original languageEnglish (US)
Pages (from-to)70-74
Number of pages5
JournalArthroscopy - Journal of Arthroscopic and Related Surgery
Issue number1
StatePublished - Jan 1 1998


  • ACL reconstruction
  • Biomechanical test
  • Bone-tendon grafts
  • Fixation strength
  • Interference screw
  • Knee reconstruction

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine


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