Abstract
Purpose
To assess the impact on ankle stability after repairing the ATFL alone compared to repairing both the ATFL and CFL in a biomechanical cadaver model.
Methods
Ten matched pairs of intact, fresh frozen human cadaver ankles (normal) were mounted to a test machine in 20.0° plantar flexion and 15.0° of internal rotation. Each ankle was loaded to body weight and then tested from 0.0° to 20.0° of inversion. The data recorded were torque at 20.0° and stiffness, peak pressure and contact area in the ankle joint using a Tekscan sensor, rotation of the talus and calcaneus, and translation of the calcaneus using a three-dimensional motion capture system. Ankles then underwent sectioning of the ATFL and CFL (injured), retested, then randomly assigned to ATFL-only Broström repair or combined ATFL and CFL repair. Testing was repeated after repair then loaded in inversion to failure (LTF).
Results
The stiffness of the ankle was not significantly increased compared to the injured condition by repairing the ATFL only (n.s.) or the ATFL/CFL (n.s.). The calcaneus had significantly more rotation than the injured condition in the ATFL-only repair (p = 0.037) but not in the ATFL/CFL repair (n.s.). The ATFL failed at 40.3% higher torque than the CFL, at 17.4 ± 7.0 N m and 12.4 ± 4.1 N m, respectively, and 62.0% more rotation, at 43.9 ± 5.6° and 27.1 ± 6.8°, respectively.
Conclusions
There was a greater increase in stiffness following combined ATFL/CFL repair compared to ATFL-only repair, although this did not reach statistical significance. The CFL fails before the ATFL, potentially indicating its vulnerability immediately following repair.
Level of evidence
III, case–control therapeutic study.
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Acknowledgements
The authors would like to thank Patrick Carry, MS, for his guidance regarding statistical analyses. He has no conflicts of interest regarding the authorship or publication of this contribution.
Funding
This study was funded by a research Grant from ISAKOS. Implants were donated by Zimmer-Biomet.
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Kenneth J. Hunt, MD, is a consultant for Panther Orthopedics. He has received institutional research funding from Acumed, Zimmer-Biomet, and Smith & Nephew. He has not personally received financial compensation from any of these entities. Todd Baldini, MSc, has received funds for research from Acumed and donation of supplies from Smith & Nephew. Pieter D’Hooghe, Helder Pereira, Pam Kumparatana, Judas Kelley, Nicholas Anderson, and Richard Fuld declare that they have no conflict of interest.
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Our Institutional Review Board does not consider laboratory studies for ethical approval. No patients were involved in this cadaveric study.
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D’Hooghe, P., Pereira, H., Kelley, J. et al. The CFL fails before the ATFL immediately after combined ligament repair in a biomechanical cadaveric model. Knee Surg Sports Traumatol Arthrosc 28, 253–261 (2020). https://doi.org/10.1007/s00167-019-05626-9
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DOI: https://doi.org/10.1007/s00167-019-05626-9