Patellar dislocation with trochlear dysplasia

Case contributed by Dr Ahmed Abd Rabou

Presentation

Knee injury during football game 2 days ago

Patient Data

Age: 18 years old
Gender: Male
Modality: MRI

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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Case Information

rID: 22677
Case created: 15th Apr 2013
Last edited: 22nd Jan 2016
Tags: knee, injury
Inclusion in quiz mode: Included

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