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*(C) '''Shenton line''' is a continuous arc drawn from the inner edge of the femoral neck to the superior margin of the obturator foramen. This should be smooth and undisrupted; otherwise it may indicate a fracture or hip dysplasia.

*(D) The '''acetabular index''' measures the acetabular roof slope. It is the most useful measure of acetabular dysplasia until 6 years of age. It is formed between Hilgenreiner line and the acetabular roof. In newborns, values of '''30° ±4° in females''' and '''26° ±5° in males''' are considered normal. Gradually this angle becomes smaller, with a mean value of '''20° ±3° in females''' and '''18° ±4° in males''' at 1 year of age.

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