Lateral patellar dislocation
Knee pain after trauma.
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Moderate joint effusion is seen.
Bone bruise involving the lateral femoral condyle is noted.
Osteochondral injury of the medial articular surface of the patella with underlying bruise is evident.
Redundant medial patellar retinaculum is present.
Baker cyst also is seen at the posteromedial aspect of the knee joint.
Lateral patellar dislocation refers to lateral displacement followed by dislocation of patella due to disruptive changes to the medial patellar retinaculum.