Presentation
Mountaineer with acute knee pain.
Patient Data
Age: 70 years
Gender: Male
From the case:
Spontaneous osteonecrosis of the knee
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Extensive bone marrow edema of the weight-bearing medial femoral condyle associated with subtle flattening of the medial femoral condyle and joint effusion. Medial meniscus shows grade II mucoid degeneration.
Case Discussion
Spontaneous osteonecrosis of the knee (SONK), also known as Ahlback disease, is a subchondral insufficiency fracture due to microtraumatic forces that has further collapsed.
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