Abstract
Purpose
This paper investigated the effect of graft fixation sequence on knee joint biomechanics after a double-bundle ACL reconstruction.
Method
Two independently published biomechanical studies that investigated the biomechanics of double-bundle ACL reconstructions using similar robotic testing systems were compared. In each study, ten human cadaveric knees were tested under three different conditions: intact, ACL deficient, and ACL reconstructed using a double-bundle technique with the anteromedial (AM) graft fixed at 60° of flexion and the posterolateral (PL) graft fixed at full extension. In one study (Study A), the AM graft was fixed first; while in another study (Study B), the PL graft was fixed first. Knee kinematics, in situ forces of the ACL and the ACL grafts were measured under two loading conditions: an anterior tibial load of 134 N and a combined tibial torques (10 N·m valgus and 5 N·m internal tibial torques) in both studies.
Result
When AM graft was fixed first, the in situ force of the AM graft was lower than the native AM bundle at all flexion angles. The in situ force in the PL graft, however, was higher than the native PL bundle at all flexion angles. When the PL graft was fixed first, the in situ force of the AM graft was higher than the native AM bundle, while the in situ forces of the PL graft were lower than the native PL bundle at all flexion angles. Both studies demonstrated that the double-bundle ACL reconstructions can closely restore the normal knee joint kinematics.
Conclusion
Even though the grafts were fixed using similar initial tensions and at same flexion angles, the sequence of fixing the two grafts in a double-bundle ACL reconstruction could alter the in situ forces in the grafts and affect the knee kinematics. These data imply that in clinical application of a double-bundle ACL reconstruction, the sequence of graft fixation should be an important surgical parameter.
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The authors gratefully acknowledge the support of the National Institutes of Health (R01AR055612).
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Chen, CH., Gadikota, H.R., Gill, T.J. et al. The effect of graft fixation sequence on force distribution in double-bundle anterior cruciate ligament reconstruction. Knee Surg Sports Traumatol Arthrosc 19, 712–718 (2011). https://doi.org/10.1007/s00167-010-1319-6
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DOI: https://doi.org/10.1007/s00167-010-1319-6