Bone marrow edema syndrome (BMES)

What is bone marrow edema syndrome (BMES)?

BMES, also known as transient osteoporosis of the hip, is a self-limited transitory clinical entity characterized by hip pain, osteopenia on radiographs, and bone marrow edema of femoral head and neck on MRI. This disorder typically affects women in the third trimester of pregnancy and middle-aged men. Usually one hip is involved, but 40% to 80% can have bilateral involvement or involvement of other joints (knee, ankle, etc.). Symptoms last an average of 6 months. Up to 40% can have recurrences. Treatment is with analgesics and protective weight bearing. IV bisphosphonates have been used successfully and should be considered. Core decompression is not indicated. BMES differs from ON on MRI because it has both femoral head and femoral neck abnormalities, whereas ON only involves the femoral head .

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