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Hip dysplasia diagnosed by ultrasound<ref name="Ultrasound detection of DDH">{{cite web|title=Ultrasound Detection of DDH - International Hip Dysplasia Institute|url=http://www.hipdysplasia.org/developmental-dysplasia-of-the-hip/infant-diagnosis/ultrasound/}}</ref> or [[projectional radiography]] (see '''[[X-ray of hip dysplasia]]'''.<ref name="X-Ray Screening">{{cite web|title=X-Ray Screening for Developmental Dysplasia of the Hip - International Hip Dysplasia Institute|url=http://www.hipdysplasia.org/developmental-dysplasia-of-the-hip/infant-diagnosis/x-ray-screening/}}</ref> Ultrasound imaging is generally preferred at up to 4 months due to limited ossification of the skeleton.<ref name=acr/><ref group="notes" name=surveillance/> ;Projectional radiography{{Main|X-ray of hip dysplasia}}Despite the widespread of ultrasound, pelvis X-ray is still frequently used to diagnose and/or monitor hip dysplasia or for assessing other congenital conditions or bone tumors.<ref name="Ruiz SantiagoSantiago Chinchilla2016">Initially largely copied from: {{cite journal|last1=Ruiz Santiago|first1=Fernando|last2=Santiago Chinchilla|first2=Alicia|last3=Ansari|first3=Afshin|last4=Guzmán Álvarez|first4=Luis|last5=Castellano García|first5=Maria del Mar|last6=Martínez Martínez|first6=Alberto|last7=Tercedor Sánchez|first7=Juan|title=Imaging of Hip Pain: From Radiography to Cross-Sectional Imaging Techniques|journal=Radiology Research and Practice|volume=2016|year=2016|pages=1–15|issn=2090-1941|doi=10.1155/2016/6369237|pmc=4738697}} [https://creativecommons.org/licenses/by/4.0/ Attribution 4.0 International (CC BY 4.0)] license</ref> The most useful lines and angles that can be drawn in the pediatric pelvis assessing hip dysplasia are as follows:<ref name="Ruiz SantiagoSantiago Chinchilla2016"/> <gallery mode=packed heights=250>File:X-ray of measurements on a normal hip.jpg|Normal hip.<ref name="Ruiz SantiagoSantiago Chinchilla2016"/>File:X-ray of measurements in hip dysplasia.jpg|Hip dysplasia.<ref name="Ruiz SantiagoSantiago Chinchilla2016"/></gallery> Different measurements are used in adults.<ref name="Ruiz SantiagoSantiago Chinchilla2016"/><noinclude>{{Bottom}}</noinclude>