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How to differentiate between SONK and osteoarthritis?
In osteoarthritis there is cartilage denudation, subchondral cysts (geode), subchondral sclerosis and marginal ostoephytes
How to differentiate between SONK and osteochondritis dessicans?
OCD usually in middle age, non weight bearing area usually lateral aspect of medial femoral condyle and detached bone fragment
Extensive bone marrow edema of the medial femoral condyle exhibiting bright STIR signal and associated with linear subchondral fracture of the weight bearing surface of the femur displaying low signal in all pulse sequences as well as subtle flattening of the medial femoral condyle and joint effusion.
Diagnosis: Spontaneous osteonecrosis of knee stage II (MRI features)