Crescent sign of avascular necrosis

A.Prof Frank Gaillard et al.

The crescent sign of avascular necrosis is seen on conventional radiographs and refers to a linear area of subchondral lucency seen most frequently in the anterolateral aspect of the proximal femoral head (which is optimally depicted on the frog-leg radiographic view). It indicates imminent articular collapse.

In the setting of Legg-Calve-Perthes disease, it heralds the beginning of the fragmentation phase (stage 2).

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Article information

rID: 7225
Section: Signs
Tags: hip, stub, refs
Synonyms or Alternate Spellings:
  • Crescent sign of femoral avascular necrosis
  • Cresent sign of femoral AVN
  • Crescent sign of avascular necrosis
  • The crescent sign of AVN
  • Crescent sign of AVN

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