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Abstract
Divergence of the interference screw placement used for femoral fixation during endoscopically
assisted reconstruction of the anterior cruciate ligament has been described. This
study is a biomechanical evaluation in 12 pairs of fresh intact bovine knees of femoral
interference screws placed divergently and parallel relative to the bone block and
its tunnel. One knee of each pair had the interference screw placed in a parallel
fashion and the other knee had a 15° divergence from the bone plug. Paired specimens
were used to provide an optimal comparison of biomechanical data of the two different
screw placements. No statistically significant differences were seen between the two
groups when looking at ultimate load, deformation, and stiffness. Mode of failure
was of more concern: in 4 of 12 divergent constructs, bone plug pullout occurred compared
with only 1 of 12 in the parallel construct. The pullout strength remains high even
with divergence of up to 15° between the bone plug and femoral interference screws
placed endoscopically.
Keywords
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Article info
Footnotes
☆Supported by the Douglas W. Jackson Orthopaedic Research Trust and by the Long Beach Memorial Medical Center Foundation
Identification
Copyright
© 1995 Published by Elsevier Inc.
