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Illustration of the proposed progression of meniscal extrusion to a medial meniscus posterior root tear (MMPRT). (A) Meniscotibial (MT) ligament stress and attenuation. (B) Progressive loss of MT ligament function, increased root stress, and early meniscal extrusion. (C) MMPRT and associated increasing extrusion. (D) Rapid articular degeneration in the setting of an incompetent extruded meniscus.
