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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.:*A tangent to the lateral facet of the patella.
: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.
