Abstract
Purpose
The purpose of this study was the evaluation of knee laxity in the ACL-deficient knee with combined meniscal tear, meniscal suture and partial medial meniscectomy.
Methods
Kinematics of the intact knee were determined in 18 human cadaver specimens in response to a 134-N anterior tibial load (aTT) as well as a combined rotatory load of 10 Nm valgus and 4 Nm internal tibial rotation using a robotic/universal force moment sensor testing system. The anterior cruciate ligament was resected. Subsequently, a vertical bucket-handle medial meniscal tear was created followed by a standard meniscus repair using horizontal inside-out stitches or a partial medial meniscectomy. Knee kinematics were calculated following every sub-step.
Results
A significant increase of anterior tibial translation was found in the ACL-deficient knee compared to the intact knee at 30° and 90° of flexion (p = 0.001; p ≤ 0.001). Additional tear of the medial meniscus significantly increased anterior tibial translation (p = 0.01). In response to a simulated pivot shift, anterior tibial translation of the intact knee did not increase significantly after ACL resection (p = 0.067). However, ACL deficiency with an additional medial meniscus tear led to a significant increase compared to the intact knee at 0° of flexion (p = 0.009).
Conclusions
Additional injury of the medial meniscus increased aTT as well as aTT under a combined rotatory load in the ACL-deficient knee whereas repair of the meniscus significantly decreased aTT.
Therefore, the meniscus status does have a significant impact on knee kinematics in the ACL-deficient knee. The present biomechanical study further highlights the importance of preserving the meniscus especially in patients with additional ACL injuries.
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Acknowledgments
The study was supported in part by a grant of the Society for Arthroscopy and Joint Surgery (AGA). The authors further thank Dr. Thomas Georg for the statistical support of the study.
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No potential conflict of interest declared.
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Lorbach, O., Kieb, M., Herbort, M. et al. The influence of the medial meniscus in different conditions on anterior tibial translation in the anterior cruciate deficient knee. International Orthopaedics (SICOT) 39, 681–687 (2015). https://doi.org/10.1007/s00264-014-2581-x
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DOI: https://doi.org/10.1007/s00264-014-2581-x