Abstract
Purpose: Medial meniscus extrusion (MME) has been suggested to be a risk factor for the progression of knee osteoarthritis (knee OA). However, its pathophysiological mechanism remains unclear. Anatomically, meniscus attaches to the femur by menisco-femoral ligament and to the tibial plateau by menisco-tibial ligament (coronary ligament). In particular, the menisco-tibial ligament plays an important role for the stability of meniscus to the tibial plateau. As osteophyte is formed in the similar process which is observed in an endochondral ossification, osteophyte is composed of not only bone part but also cartilage part at the peripheries of the articular cartilage.
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