MRI of the knee shows multiple findings of patellar dislocat | Figure 1

CincyKidsRad

Cincinnati Children's Radiology

MRI of the knee shows multiple findings of patellar dislocation. There is a classic bone bruise pattern with bright signal in the lateral femoral condyle and the medial patellar facet (arrows). There is a large lipohemarthrosis (arrowhead) with a parfait effect and layering of three different signal intensities. Finally, there is disruption of the medial patellofemoral ligament (dashed arrow). Other findings are also present including cartilage disruption, soft tissue edema, and a flattened femoral trochlea.

Patellar dislocation can occur from direct trauma or may be associated with congenital/anatomic differences such as femoral trochlea dysplasia, excessive lateral patellar tilt, and patella alta. #MSKMonday

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