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Evaluation pelvis asymmetry and/or axial rotation based on the projection of the center of S1 on the segment formed by the two centroids of the acetabuli. Using the offset between the two acetabuli as reference (scale 0–100), a projection of S1 in the middle of the two acetabuli is denoted as 50% (neutral rotation), a projection toward the left acetabulum will be between 0 and 50, and towards the right acetabulum will be between 50 and 100
