Subchondral insufficiency fracture of the knee with meniscal root tear
Knee pain. Limp.
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Tear of the posterior root medial meniscus with extrusion of the meniscal body. Upper surface horizontal tear of the body lateral meniscus extending to the undersurface of the posterior horn with posterolateral parameniscal cyst formation.
Grade 4 chondral loss on both femoral and tibial surface medial compartment.
Edema throughout the medial femoral condyle centered on a 10 mm subchondral T1 hypointensity with some cortical depression of the weight-bearing surface.
Subchondral insufficiency fractures, previously known as spontaneous osteonecrosis of the knee (SONK), are often very painful. In this case, there are associated severe meniscal injuries.