Presentation
Trauma to the left knee.
Patient Data
Age: 25 years
Gender: Female
From the case:
Transient lateral patellar dislocation
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- moderate lateral patellar displacement
- large area of bone contusion of the medial aspect of the patella and lateral femoral condyle
- disruption of the medial retinaculum with adjacent periligamentous edema
- moderate joint effusion (hemarthrosis)
- prepatellar subcutaneous edematous infiltration
- cortical depression with bone marrow edema of the lateral femoral condyle in keeping with a focal impaction fracture
- horizontal tear of the medial meniscal (posterior horn)
- normal appearance of the lateral meniscus, cruciate, and collateral ligaments.
Case Discussion
MRI features of a transient lateral dislocation of the patella with a medial meniscal tear.