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→Measurements in children: +Diagrams
*(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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File:Acetabular index by age in males.png|Acetabular index by age in males.<ref name="Akel2013">{{cite journal|last1=Akel|first1=İbrahim|title=Acetabular index values in healthy Turkish children between 6 months and 8 years of age: a cross-sectional radiological study|journal=Acta Orthopaedica et Traumatologica Turcica|volume=47|issue=1|year=2013|pages=38–42|issn=1017995X|doi=10.3944/AOTT.2013.2832}}</ref>
File:Acetabular index by age in females.png|Acetabular index by age in females.<ref name="Akel2013"/>
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*(E) The '''medial articular joint space''' is measured between the medial border of the femoral head or neck (when epiphysis is not ossified) and the acetabular platform. Normal values range between 5 and 12 mm. Differences greater than 1.5 mm between the two sides are considered abnormal.
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