Grey cortex sign (stress fracture)

Dr Henry Knipe and Dr Tim Luijkx et al.

The grey cortex sign was described as an early sign of stress (fatigue) fractures on plain radiographs and refers to subtle ill-definition/lucency of the cortex at the site of microfracture. However, plain radiography is insensitive (~25%, range 15-25%) for the detection of early-stage injuries. CT is much more sensitive for the detection of bone loss that precedes true fracture 1, however, MRI is the most sensitive/specific modality for the diagnosis of fatigue fractures 4.

Fractures
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Article information

rID: 52654
Section: Signs
Synonyms or Alternate Spellings:
  • Gray cortex sign (stress fracture)

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