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Spontaneous osteonecrosis of the knee

Case contributed by Dr Natalie Yang

Patient Data:

Age: 65
Gender: Male
Modality: MRI

Spontaneous osteonecrosis of the knee (SONK) of the lateral aspect of the medial condyle (most common location). Incidental bakers cyst.

Modality: X-ray

Case Discussion:

Spontaneous osteonecrosis of the knee (SONK) involving the weightbearing portion of the medial femoral condyle, with associated articular surface impacttion fracture.  Maceration and degenerative tears of the body and posterior horn of the medial meniscus is associated with meniscal extrusion and osteophytic lipping.

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