Abstract
The anterior cruciate ligament (ACL) is the most frequently injured ligament of the knee. Its surgical management has been using a soft tissue graft as a replacement. The results of ACL reconstruction have been successful for many patients as it can restore joint stability and relieve pain. However, longer term follow up studies have shown unsatisfactory outcomes with as many as 25% of patients having complications that include prevalence of osteoarthritis. With the advances in tissue engineering and regeneration, there is a renewed interest in healing an injured ACL in order to preserve its complex anatomy and proprioceptive responses of the native ACL. Biotherapies including microfracture have been used clinically for healing of an injured ACL. In animal studies, the use of hyaluronic acid, mesenchymal stem cells, platelet-rich plasma, and extracellular matrix bioscaffolds have also resulted in neo-tissue formation to a varying degree. In general, the ACL heal rate is slow and the lack of loading to the healing ACL has deleterious effects on its attachments to bone. Thus, in our research center, mechanical augmentation that could maintain joint stability while simultaneously loading the healing ACL has been used in combination with biological augmentation to incite more robust tissue healing. Using a goat model, the ACL was found to be well healed at 12 weeks. Robotic measurements revealed good stifle joint stability while the tensile strength of the healing ACL was 3 times greater than suture repair and 1.8 times greater than ACL reconstruction. For the future, novel biotherapies, together with precision medicine that is “big data” based, in combination with mechanical augmentation will be explored for human application. In the end, surgeons will be able to tailor biotherapies to heal the ACL on selected patients for more positive outcomes in the long term.
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Mau, J.R., Wang, H., Woo, S.LY. (2017). The Use of a Large Animal Model and Robotic Technology to Validate New Biotherapies for ACL Healing. In: Gobbi, A., Espregueira-Mendes, J., Lane, J., Karahan, M. (eds) Bio-orthopaedics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-54181-4_15
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