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The femoral head-acetabular relationship after the head has fully ossified is expressed (on X-ray) by
|B||CE angle of Wiberg|
|C||Head shaft angle|
CE angle of Wiberg
This is an angle subtended by the centre (C) of the femoral head and the edge of the acetabulum (E) that is the edge of the superior acetabular roof. Normally it is about 36°.