Figure 1.

Lateral center-edge angle (LCEA). The LCEA is an angle formed by a line from the center of the femoral head extending superiorly and perpendicular to the transverse axis of the pelvis and a line from the center of the femoral head through the lateral acetabular rim. (A) Coronal T2 fat-saturated magnetic resonance arthrography illustrating how the LCEA of Wiberg includes part of the labral base that is not actually part of the weightbearing zone. (B and C) Anteroposterior pelvis radiographs illustrating the difference in LCEA as measured by the (B) Ogata method ³⁴ versus (C) Wiberg method. ⁵⁶