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Bone-ligament interaction in patellar tendon reconstruction of the ACL

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Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

The bone-ligament junction is one of the most complex biological tissues. Its key function is distribution of mechanical loads applied to the ligament in such a way as to diminish the concentration of stresses or shearing at the interface. This paper reports an experimental assessment of the extent to which a nearly normal junction is formed following reconstruction of the anterior cruciate ligament (ACL) with patellar tendon in 20 New Zealand white rabbits sacrificed after 2–38 weeks. A histological comparison was also made with cadaver ACLs. After 5 weeks the new ligament was still separate from the tunnel wall, inflammation was no longer present, and there was no junction tissue. A thin fibrocartilage layer was observed between the bone and the ligament after 12 weeks and was thicker 6 weeks later. After 28 weeks, there was a substantial layer of fibrocartilage. The new junction was virtually “physiological” by the 38th week, with all four layers present. Many fibrocartilaginous cells were also visible between the collagen fibres. The bone-ligament insertion was almost normal. These findings indicate that tendon reconstruction results in the formation of a structure very similar to a physiological junction, and thus ensures better load distribution over a greater ligament insertion area.

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Panni, A.S., Fabbriciani, C., Delcogliano, A. et al. Bone-ligament interaction in patellar tendon reconstruction of the ACL. Knee Surg, Sports traumatol, Arthroscopy 1, 4–8 (1993). https://doi.org/10.1007/BF01552150

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