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Avascular necrosis of the knee

Modality: MRI (STIR) Double line sign and Rim sign Open arrow = double line sign Simple arrow = rim sign

From the case:

Avascular necrosis of the knee - “This young bone marrow recipient patient is on high dose steroids, and developed extensive AVN of the knee. ”

Used in the following articles:

  • Double line sign - “The double line sign is an MRI finding seen at the periphery of a region of osteonecrosis (avascular necrosis, bone infarct). It is best seen on T2...”
  • Osteochondral injury staging - “Osteochondral injury staging system for MRI attempts to grade the stability and severity of osteochondral injury and is used to plan management.  ...”
  • Rim sign of avascular necrosis - “The rim sign comprises a high T2 or intermediate T1 signal line sandwiched between two low signal lines, and represents fluid between sclerotic bor...”
  • Osteochondral defect - “Osteochondral defects are focal areas of articular damage with cartilage damage and injury of the adjacent subchondral bone. It is a term that enco...”

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