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*Comparison on '''ossification''' of the femoral heads.
Wording
*(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.
Also check for any asymmetric or age-inconsistent mineralization ossification of the femoral heads.
===Further workup===
In case of hip dysplasia, also perform the following:
*'''Reimer's migration index''', which can be used to indicate hip dislocation. The migration index (MI) is normally less than 33%.<ref>{{cite web|url=http://www.actaorthopaedica.be/acta/download/2008-5/06-Persiani%20et%20al.pdf|title=Hip subluxation and dislocation in cerebral palsy: Outcome of bone surgery in 21 hips|author1=Pietro PERSIANI|author2=Iakov MOLAYEM|year=2008|author3=Alessandro CALISTRI|author4=Stefano ROSI|author5=Marco BOVE|author6=Ciro VILLANI|journal=Acta Orthop. Belg.}}</ref>
===Report===
*Absence or presence of signs of hip dysplasia, including at least any abnormal measurement.
:*If hip dysplaia, also report:
::*Reimer's migration index, with a subjective grading of lateralization.
::*Even normal '''ossification''' of the femoral heads.
Example:
{|class="wikitable"
| [[File:X-ray of measurements in hip dysplasia, with numbers.jpg|150px]]
| Left-sided hip dysplasia, with normal acetabular index. Mild lateralization, with Reimer's migration index of 35%. Normal ossification of the femoral heads.
|}
