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Meniscal Root Tears: An Update Focused on Preoperative and Postoperative MRI Findings

Júlio B. Guimarães, Renan N. Chemin, Flavia F. Araujo, Thomas M. Link, Flávio D. Silva, Alexandre Bitar, Marcelo A. C. Nico, Alípio G. O. Filho

Abstract: Meniscal root tears represent radial tears or avulsions of the meniscal cartilage at the tibial attachment site that profoundly affect meniscal biomechanics and kinematics. Meniscal root tears have the functional effect of a total meniscectomy and can lead to rapid degenerative change with development of early knee osteoarthritis (OA). A growing range of arthroscopic surgical techniques have been developed to repair meniscal root tears with the aim of restoring joint kinematics and contact pressures and delaying the development of OA. Following increased understanding of the anatomy and biomechanics of the meniscal root, meniscal root injury repair has become the treatment of choice in knees with nonadvanced OA. This article reviews the anatomy and biomechanics of the meniscal roots, clinical and imaging diagnostic criteria of meniscal root tears, correlation between arthroscopy and MRI in the diagnosis and classification of meniscal root tears, and expected and abnormal MRI findings after meniscal root repair. Familiarity with MRI signs and classifications of meniscal root tears, as well as with root repair surgical techniques, can aid radiologists in correctly reporting preoperative and postoperative MRI findings.
Keywords: root tears / Findings Meniscal root / MRI Findings Meniscal / MRI findings after meniscal root

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