An active young adult may suffer an acute dislocation of the patella.


Risk factors:

(1) tall

(2) higher body weight


Clinical features:

(1) knee pain with hemarthrosis

(2) disruption of the medial patellofemoral ligament (MPFL)

(3) variable rupture of the medial retinaculum

(4) no history of a previous knee dislocation


The occurrence of a primary patellar dislocation places the patient at increased risk for a subsequent recurrence.


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