Double line sign

Dr Craig Hacking and A.Prof Frank Gaillard et al.

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 weighted sequences and consists of an inner bright T2 line representing granulation tissue and surrounding dark zones representing adjacent sclerotic bone. This sign is reported in up to 80% of cases 3.

It should not be confused with the rim sign demarcating an osteochondral fragment with surrounding fluid (indicating that it is potentially unstable).

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Article information

rID: 1236
Section: Signs
Tag: stub, cases
Synonyms or Alternate Spellings:
  • Double line sign of AVN
  • Double line sign of avascular necrosis

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Cases and figures

  • Case 1: T1
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  • Case 1: double line and rim signs
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  • Case 2
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  • Case 3: humerus head
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