Lateral patellar dislocation
Knee trauma with subsequent severe pain.
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- Large bony bruise involving the lateral femoral condyle.
- Osteochondral disruption of the medial articular surface of the patella with underlying bruise.
- Redundant medial patellar retinaculum.
- Moderate joint effusion.
Lateral patellar dislocation is usually due to twisting injury which results in the patella dislocating laterally and impacting onto the lateral femoral condyle, which results in bony bruises at both involved surfaces.