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Published in: Journal of Orthopaedics and Traumatology 1/2018

Open Access 01-12-2018 | Original Article

Can tape–screw fixation of a quadrupled semitendinosus graft in a full-length tibial tunnel provide superior fixation compared with a doubled semitendinosus–gracilis held with an interference screw? A matched-pair cadaveric biomechanical comparison

Authors: Christopher J. Vertullo, Joseph Cadman, Dané Dabirrahmani, Richard Appleyard

Published in: Journal of Orthopaedics and Traumatology | Issue 1/2018

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Abstract

Background

In anterior cruciate ligament reconstruction, quadrupled semitendinosus (Quad ST) grafts have potential advantages over doubled semitendinosus–gracilis (ST/G) including larger diameter and gracilis preservation, however the ideal tibial fixation method of the resultant shorter Quad ST graft remains elusive if a fixed-loop suspensory fixation device is used on the femur. We investigated whether the tibial fixation biomechanical properties of a Quad ST fixed indirectly with polyethylene terephthalate tape tied over a screw in a full outside-in created tunnel was superior to a ST/G graft fixed with an interference screw.

Materials and methods

In a controlled laboratory study, six cadaveric matched pairs of each construct were subjected to cyclic loading to mimic physiologic loading during rehabilitation. This included preconditioning cycling, cyclic loading to 220 N for 500 cycles, then cyclic loading to 500 N for 500 cycles.

Results

High standard deviations across the measured parameters occurred with no significant difference between measured parameters of elongation for the different constructs. Elongation of the Quad-ST construct was greater at 10 and 100 cycles, but not statistically different. Four of the six Quad-ST constructs failed below 100 cycles, compared with two failures below 100 cycles in the ST/G construct. There was a strong correlation between cycles to failure and bone mineral density for the Quad ST-tape constructs.

Conclusions

Tibial fixation of Quad ST with a tied tape–screw construct in a full-length tunnel was not biomechanically superior to ST/G graft fixed with an interference screw, exhibited greater nonsignificant construct elongation with earlier failure, and was more reliant on bone mineral density.

Level of evidence

In vitro laboratory study.
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Metadata
Title
Can tape–screw fixation of a quadrupled semitendinosus graft in a full-length tibial tunnel provide superior fixation compared with a doubled semitendinosus–gracilis held with an interference screw? A matched-pair cadaveric biomechanical comparison
Authors
Christopher J. Vertullo
Joseph Cadman
Dané Dabirrahmani
Richard Appleyard
Publication date
01-12-2018
Publisher
Springer International Publishing
Published in
Journal of Orthopaedics and Traumatology / Issue 1/2018
Print ISSN: 1590-9921
Electronic ISSN: 1590-9999
DOI
https://doi.org/10.1186/s10195-018-0495-x

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