Abstract
Purpose
To compare the biomechanical strength of different fixation configurations using suspensory buttons in a soft-tissue quadriceps tendon (QT) grafts in anterior cruciate ligament (ACL) reconstruction.
Methods
Forty bovine QTs, 6-cm long and 10-mm wide, were allocated into four groups with different suture configurations using suspensory buttons (n = 10 in each group): Group A, a baseball suture with a knot tied to the continuous loop with a suspensory button; Group B, same configuration as in Group A but with the knot tied at the opposite end of the baseball suture; Group C, a continuous loop with a suspensory button stitched directly to the QT with simple sutures, and Group D, a baseball suture tied directly to a suspensory button. Biomechanical testing was performed by preloading followed by cyclic loading for 500 cycles between 10 and 100 N. The length of elongation (mm) and maximum load to failure (N) were recorded, and compared among the four groups.
Results
Group C showed significantly smaller elongation (4.1 mm [95% CI 3.1–5.2]) than Group A (8.2 mm [95% CI 7.0–9.4]), Group B (10.5 mm [95% CI 7.7–13.3]), and Group D (8.5 mm [95% CI 7.0–9.9]) (A–C; P = 0.004, B–C; P = 0.0001, C–D; P = 0.0018). The maximum load to failure in Group C (386 N [95%CI 306–466]) was significantly higher than that in Group A (196 N [95% CI 141–251]), Group B (226 N [95% CI 164–289]), and Group D (212 N [95%CI 171–253]) (A–C; P = 0.0001, B–C; P = 0.0009, C–D; P = 0.0002). No significant differences were observed between Group A, B, and D in terms of elongation and maximum load to failure.
Conclusion
The soft-tissue QT graft fixation configuration stitched directly to a continuous loop with suspensory button using simple sutures exhibits small elongation and high maximum load to failure among the four configurations. Regarding clinical relevance, direct suturing of the soft-tissue QT to a continuous loop with a suspensory button may be advantageous for femoral fixation in ACL reconstruction from a biomechanical perspective, and warrant future development of a novel fixation device using this principle.
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Acknowledgements
The authors thank Masato Nakanishi for assistance in creating the figure and Toshiki Hirai for providing the bovine knees.
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KaN, YH, DA, NK, TM, and RK conceived the study, and KK, KaN, and YH participated in the design of the study. KK, KaN, and KoN performed the biomechanical testing. KK, and KaN conducted the pertinent statistical tests and analyses. All authors participated in the interpretation of the data. KK, KaN, YN wrote the manuscript, and all authors performed critical revision of the manuscript for intellectual content. All authors have read and approved the final manuscript.
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Kamada, K., Nagai, K., Nagamune, K. et al. Direct suturing quadriceps tendon to a continuous loop with a suspensory button provides biomechanically superior fixation in ACL reconstruction. Knee Surg Sports Traumatol Arthrosc 30, 2307–2313 (2022). https://doi.org/10.1007/s00167-021-06805-3
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DOI: https://doi.org/10.1007/s00167-021-06805-3