Left-sided, early, undisplaced ("preslip") slipped capital femoral epiphysis

In this patient with left-sided, early, undisplaced ("pre-slip") slipped capital femoral epiphysis (SCFE), the anteroposterior (A) and lateral (B) radiographs show only widening of the capital femoral physis (arrows). This finding is easier to detect in pelvic (rather than isolated hip) radiographs, which permit comparison with the opposite side. In the anteroposterior view, Klein line (dashed yellow line) appropriately intersects the lateral portion of the femoral head; as SCFE progresses and the femoral head is displaced, Klein line no longer intersects the lateral portion of the femoral head.