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|author1=[[User:Mikael Häggström|Mikael Häggström]]
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==Evaluation==
In obvious patellar dislocation, make a rough estimation of the distance compared to normal position.
In borderline cases of subluxation, preferably apply the following measurements:
*The '''lateral patellofemoral angle''', formed by:<ref name="SagginSaggin2012">{{cite journal|last1=Saggin|first1=Paulo Renato Fernandes|last2=Saggin|first2=Jose Idílio|last3=Dejour|first3=David|title=Imaging in Patellofemoral Instability|journal=Sports Medicine and Arthroscopy Review|volume=20|issue=3|year=2012|pages=145–151|issn=1062-8592|doi=10.1097/JSA.0b013e3182553cfe}}</ref>
:*A line connecting the most anterior points of the medial and lateral facets of the trochlea
:With the knee in 20° flexed, this angle should normally open laterally.<ref name="SagginSaggin2012"/>
*The '''patellofemoral index''' is the ratio between the thickness of the medial joint space and the lateral joint space (L). With the knee 20° flexed, it should measure 1.6 or less.
Also, look for any resultant fractures of the patella.
{{Bottom}}
|author1=[[User:Mikael Häggström|Mikael Häggström]]
|author2=
}}
==Evaluation==
In obvious patellar dislocation, make a rough estimation of the distance compared to normal position.
In borderline cases of subluxation, preferably apply the following measurements:
*The '''lateral patellofemoral angle''', formed by:<ref name="SagginSaggin2012">{{cite journal|last1=Saggin|first1=Paulo Renato Fernandes|last2=Saggin|first2=Jose Idílio|last3=Dejour|first3=David|title=Imaging in Patellofemoral Instability|journal=Sports Medicine and Arthroscopy Review|volume=20|issue=3|year=2012|pages=145–151|issn=1062-8592|doi=10.1097/JSA.0b013e3182553cfe}}</ref>
:*A line connecting the most anterior points of the medial and lateral facets of the trochlea
:With the knee in 20° flexed, this angle should normally open laterally.<ref name="SagginSaggin2012"/>
*The '''patellofemoral index''' is the ratio between the thickness of the medial joint space and the lateral joint space (L). With the knee 20° flexed, it should measure 1.6 or less.
Also, look for any resultant fractures of the patella.
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