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→Measurements in children: Detailed
*(A) '''Hilgenreiner line'''. It is considered a basal line joining the top aspect of the triradiate cartilages. This line is used to measure the acetabular angle and as a reference for Perkin line.
*(B) '''Perkin line''' is perpendicular to Hilgenreiner line, touching the lateral margin of the acetabulum. This leads to four quadrants and a normal femoral head has to be located in the inferomedial quadrant. We can measure the lateral displacement of the femoral head with regard to the Perkin line by dividing the width of the head that crosses the Perkin line by the diameter of the head. The value for patients under 3 years must be 0 and in older children this ranges from 0 to 22%.
*(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 In children over about 3 to 5 years of age, this line should be smooth and undisrupted; , otherwise it may indicate a fracture or hip dysplasia.<ref>Page [https://books.google.se/books?id=EKlGaJAv4y0C&pg=PA1000 Page 1000] in: {{cite book|title=Lovell and Winter's Pediatric Orthopaedics|author=Wood W. Lovell, Robert B. Winter, Raymond T. Morrissy, Stuart L. Weinstein|year=2006|publisher=Lippincott Williams & Wilkins|isbn=9780781753586}}</ref>
*(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.
