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===Choice of modality===
{|class="wikitable" align="right"
|+ ACR Appropriateness Criteria for hip dysplasia<ref name=acr>{{cite web|url=https://acsearch.acr.org/docs/69437/Narrative/|title=ACR Appropriateness Criteria - Developmental Dysplasia of the Hip (DDH)–Child|website=American College of Radiology}} Revised 2018</ref>
! Age !! Scenario !! Usual appropriate initial imaging
|-
!rowspan=2| <4 weeks
| Equivocal physical examination or risk factors || No imaging
|-
| Physical findings of DDH || Ultrasonography
|-
! 4 weeks - 4 months
| Equivocal physical examination or risk factors || Ultrasonography
|-
! 4 - 6 months
| Concern for DDH || X-ray. Ultrasonography may be appropriate<ref group="notes" name=surveillance>Ultrasonography is the imaging method of choice up to 6 months for the nonoperative surveillance imaging in harness of known diagnosis of DDH.<br>- {{cite web|url=https://acsearch.acr.org/docs/69437/Narrative/|title=ACR Appropriateness Criteria - Developmental Dysplasia of the Hip (DDH)–Child|website=American College of Radiology}} Revised 2018</ref>
|-
! >6 months
| || X-ray
|}
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"/>
{|class="wikitable" align="right"
|+ ACR Appropriateness Criteria for hip dysplasia<ref name=acr>{{cite web|url=https://acsearch.acr.org/docs/69437/Narrative/|title=ACR Appropriateness Criteria - Developmental Dysplasia of the Hip (DDH)–Child|website=American College of Radiology}} Revised 2018</ref>
! Age !! Scenario !! Usual appropriate initial imaging
|-
!rowspan=2| <4 weeks
| Equivocal physical examination or risk factors || No imaging
|-
| Physical findings of DDH || Ultrasonography
|-
! 4 weeks - 4 months
| Equivocal physical examination or risk factors || Ultrasonography
|-
! 4 - 6 months
| Concern for DDH || X-ray. Ultrasonography may be appropriate<ref group="notes" name=surveillance>Ultrasonography is the imaging method of choice up to 6 months for the nonoperative surveillance imaging in harness of known diagnosis of DDH.<br>- {{cite web|url=https://acsearch.acr.org/docs/69437/Narrative/|title=ACR Appropriateness Criteria - Developmental Dysplasia of the Hip (DDH)–Child|website=American College of Radiology}} Revised 2018</ref>
|-
! >6 months
| || X-ray
|}
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"/>
