The metaphyseal blanch sign of Steel is one of the signs seen on AP views of the adolescent hip indicating posterior displacement of the capital epiphysis.
It is a crescent-shaped area of increased density, that overlies the metaphysis adjacent to the physis on the AP radiograph. It is caused by superposition of the femoral neck and the posteriorly displaced capital epiphysis.
Thus suggesting slipping of the capital femoral epiphysis on the AP view, a lateral radiograph is indicated to confirm or exclude the suspected diagnosis.
- 1. Steel HH. The metaphyseal blanch sign of slipped capital femoral epiphysis. J Bone Joint Surg Am. 1986;68 (6): 920-2. Pubmed citation