Biomechanical testing of fixed and adjustable femoral cortical suspension devices for ACL reconstruction under high loads and extended cyclic loading
Purpose To compare loop elongation after 5000 cycles, loop-elongation at failure, and load at failure of the fixed-loop G-Lok device and three adjustable-loop devices (UltraButton, RigidLoop Adjustable and ProCinch RT), during testing over extended cycles under high loading. Methods Five devices of...
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Veröffentlicht in: | Journal of Experimental Orthopaedics 2020-05, Vol.7 (1), p.27-27, Article 27 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Purpose
To compare loop elongation after 5000 cycles, loop-elongation at failure, and load at failure of the fixed-loop G-Lok device and three adjustable-loop devices (UltraButton, RigidLoop Adjustable and ProCinch RT), during testing over extended cycles under high loading.
Methods
Five devices of each type were tested on a custom-built rig fixed to an Instron machine. The testing protocol had four stages: preloading, cyclic preconditioning, incremental cyclic loading and pull-to-failure. Outcome measures were loop elongation after 5000 cycles, loop-elongation at failure, and load at failure.
Results
The loop elongation after 5000 cycles for G-Lok was 1.46 ± 0.25 mm, which was comparable to that of RigidLoop (1.51 ± 0.16 mm,
p
= 1.000) and ProCinch (1.60 ± 0.09 mm,
p
= 1.000). In comparison, the loop elongation for UltraButton was 2.66 ± 0.28 mm, which was significantly larger than all other devices (
p
= 0.048). The failure load for all devices ranged between 1455 and 2178 N. G-Lok was significantly stronger than all adjustable-loop devices (
p
= 0.048). The elongation at failure was largest for UltraButton (4.20 ± 0.33 mm), which was significantly greater than G-Lok (3.17 ± 0.33 mm,
p
= 0.048), RigidLoop (2.88 ± 0.20 mm,
p
= 0.048) and ProCinch (2.78 ± 0.08 mm,
p
= 0.048). There was no significant difference in elongation at failure for the rest of the devices.
Conclusions
Our study has shown that the G-Lok fixed-loop device and the three adjustable-loop devices (UltraButton, RigidLoop Adjustable and ProCinch RT) all elongated less than 3 mm during testing over an extended number of cycles at high loads, nonetheless, the fixed loop device performed best in terms of least elongation and highest load at failure. |
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ISSN: | 2197-1153 2197-1153 |
DOI: | 10.1186/s40634-020-00235-9 |