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The acetabular depth ratios (ADR) were measured in the following manner: (A) the coronal ADR was determined as the ratio of acetabular depth (a) to width (b) multiplied by 1000 in the coronal plane passing through the femoral head center; (B) the axial ADR was determined as the ratio of acetabular depth (c) to width (d) multiplied by 1000 in the axial plane passing through the femoral head center.
