Grey cortex sign (stress fracture)
The grey cortex sign was described as an early sign of stress (fatigue) fractures on conventional radiographs and refers to subtle ill definition of the cortex.
However, conventional radiography is insensitive for the detection of early-stage fatigue fractures. CT is much more sensitive for detection of bone loss that precedes true fracture 1.
- 1. Gaeta M, Minutoli F, Scribano E, Ascenti G, Vinci S, Bruschetta D, Magaudda L, Blandino A. CT and MR imaging findings in athletes with early tibial stress injuries: comparison with bone scintigraphy findings and emphasis on cortical abnormalities. Radiology. 235 (2): 553-61. doi:10.1148/radiol.2352040406 - Pubmed
- 2. Mulligan ME. The "gray cortex ": an early sign of stress fracture. Skeletal radiology. 24 (3): 201-3. Pubmed
- 3. Daffner RH. Anterior tibial striations. AJR. American journal of roentgenology. 143 (3): 651-3. doi:10.2214/ajr.143.3.651 - Pubmed