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 radiograph with early slip.
In the normal adolescent hip, an intra-articular portion of the diaphysis of the collum overlies the posterior wall of the acetabulum inferomedially. This superposition creates a dense triangular appearance on x-rays.
Most patients with slipped epiphysis show loss of this dense triangle.
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