Presentation
Knee injury during football game 2 days ago
Patient Data
Age: 18 years old
Gender: Male
From the case:
Patellar dislocation with trochlear dysplasia
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Completely torn patellofemoral ligament and lateral patellar subluxation.
Bone marrow contusion exhibiting bright STIR signal seen at medial patellar facet and lateral femoral condyle which is characteristic of patellar dislocation.
Hemorrhagic joint effusion (note the high signal in T1WI)
Case Discussion
Diagnosis: Acute patellar subluxation
When applying valgus stress on the patella the patellofemoral ligament is torn and the medial patellar facet hits the lateral femoral condyle resulting in characteristic marrow edema pattern.
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