Osteonecrosis (ON) of the femoral head is a potentially disabling condition affecting primarily young active adults. We can alter the course of the disease by early recognition, diagnosis and targeted treatment. There are different systems of diagnosis and classification of femoral head ON and different courses of treatment have been developed for each stage with variable success. Any attempt to depict an osteonecrotic lesion should use magnetic resonance imaging with adequate fat suppression.

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... ast magnetic resonance sequence at multiple sites in patients with ON is an inexpensive, secure and fast way of early diagnosis. Our intention is to highlight certain aspects of hip osteonecrosis concerning etiology, differential diagnosis and management, such as steroid induced osteonecrosis and acute bone marrow edema syndromes.