Mechanical Design of an Auxiliary Fixation Technique to Make Single Bundle Graft for ACL Reconstruction

Seyed Amirhossein Sajedi, Solmaz Mojadam Mofrad, Amir Nourani, Mahmoud Chizari

Research output: Contribution to conferencePaperpeer-review

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Abstract

Purpose: The present study, introduced and mechanically
tested an alternative method for graft preparation for ACL
reconstruction surgery. The designed method aimed to
offer a replacement for conventional suturing which
reduces the chance of graft rupture and gradually
increases the fixation strength. Methods: to validate the
study a set of experiments was performed. Five bovine
tendon samples were harvested and trimmed into identical
sizes. Samples were passed through two endo buttons and
looped in a manner that both ends share a common
surface. Two custom straps were later applied around the
graft. A three-stage mechanical test was performed, a
cyclical preload of 10 to 50 N, 10 cycles, and 0.1 Hz. The
major pullout test with a cyclical load of 50 to 200 N, 1
Hz for 200 cycles, and a pullout force with a loading rate
of 20 mm/min determining the ultimate strength of the
fixation. Results: No failure occurred on the overall
structure during the cyclic stages. Also, no failure
associated with tendon tissue damage was recorded. All
samples experienced a fixation failure during the final
pull-out test. The mean values for ultimate strength, cyclic
elongation, and Average cyclic Stiffness were 287.66 ±
11.84 N, 2.08 ± 0.15 mm, and 14.52 ± 1.09 kN/mm
respectively. Conclusions: The results indicate that using
the proposed strapping method not only reduces any
chance of tendon tearing but also presents acceptable
major mechanical properties in comparison with the
conventional suturing method. The study showed that the
new design was mechanically sound.
Original languageEnglish
Publication statusPublished - 11 May 2023

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