Changes

*'''Reimer's migration index''' (MI), also called the ''femoral extrusion index'',<ref name="Ruiz SantiagoSantiago Chinchilla2016"/> is calculated if in order to detect and quantify any hip dysplasia is detecteddislocation. It is the horizontal distance (parallel to the ''Hilgenreiner Line'') between the Perkin line and the lateral border of the ossification center of the femoral head, divided by the horizontal width of the ossification center. The migration index is normally less than 33% by most sources,<ref name=Persiani>{{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> but 25% and 30% has also been suggested.<ref name="StottPiedrahita2007">{{cite journal|last1=Stott|first1=N Susan|last2=Piedrahita|first2=Luis|title=Effects of surgical adductor releases for hip subluxation in cerebral palsy: an AACPDM evidence report*|journal=Developmental Medicine & Child Neurology|volume=46|issue=9|year=2007|pages=628–645|issn=00121622|doi=10.1111/j.1469-8749.2004.tb01029.x}}</ref>