The Scham sign of slipped capital femoral epiphysis is one of the subtle signs that may be seen on the AP view of an adolescent hip with early slip.
In the normal adolescent hip, an intraarticular portion of the diaphysis of the collum overlies the posterior wall of the acetabulum inferiomedially. This superposition creates a dense triangular appearance on X-rays.
Most patients with slipped epiphysis show loss of this dense triangle.
- 1. Scham SM. The triangular sign in the early diagnosis of slipped capital femoral epiphysis. Clin. Orthop. Relat. Res. 1974; (103): 16-7. Pubmed citation