Spontaneous Osteonecrosis of the Knee or SONK is the result of vascular arterial insufficiency to the medial femoral condyle of the knee resulting in necrosis and destruction of bone. It is more common in females over the age of 50 with possible risk factors of corticosteroid use, Lupus, alcoholism, pancreatitis, sickle cell anemia, and rheumatoid arthritis.
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