Abstract
Purpose: Recently, spontaneous osteonecrosis of the knee joint (SONK) has been discussed to be renamed for a subchondral insufficiency fracture of the knee joint (SIFK), as pathophysiology of SONK has been revealed to be a subchondral insufficiency fracture which is occurred by accumulation of mechanical stress to the subchondral bone due to meniscal extrusion, injury, and tear regardless of the status of articular cartilage. However, it is remained unclear for the pathophysiology and clinical course of SIFK.
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