MRI appearance
T1-weighted images: A peripheral band of low signal is present in the superior portion of the femoral head outlining a central area of bone marrow.
T2-weighted images: The inner border of the peripheral band demonstrates high signal. This is termed the double-line sign and is pathognomonic for AVN.
T1-weighted images: A peripheral band of low signal is present in the superior portion of the femoral head outlining a central area of bone marrow.
T2-weighted images: The inner border of the peripheral band demonstrates high signal. This is termed the double-line sign and is pathognomonic for AVN.
Classification of the AVN lesion
Class A: Central osteonecrotic focus signal analogous to that of fat.
Class B: Central osteonecrotic focus signal analogous to that of blood.
Class C: Central osteonecrotic focus signal analogous to that of fluid.
Class D: Central osteonecrotic focus signal analogous to that of fibrous tissue
Dr.Sumer K Sethi, MD
Sr Consultant Radiologist ,VIMHANS and CEO-Teleradiology Providers
Editor-in-chief, The Internet Journal of Radiology
Director, DAMS (Delhi Academy of Medical Sciences
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