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:*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.<ref name="SagginSaggin2012"/>
Also, look for any resultant fractures of the patella.
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