Presentation
15 years old girl with post-traumatic anterior knee pain.
Patient Data
Age: 15 years
From the case:
Transient patellar dislocation
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- the medial patellar facet and the lateral femoral condyle show osseous bruising with detached small bone fragments as well as marrow edema signal with low T1 and high PDFS / STIR signal intensity.
- the medial patellar retinaculum shows focal partial thickness tear with edema signal intensity within and around.
- moderate hemorrhagic joint effusion with fat-fluid level (lipohemarthrosis).
- no meniscal tear.
- intact cruciates and collateral ligaments as well as lateral patellar retinaculum, quadriceps and patellar tendons.
- normal signal and girth of the peri-articular musculature with preserved intermuscular fat planes.
From the case:
Transient patellar dislocation
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- transient patellar dislocation with osseous bruising and fracture of the medial patellar facet as well as the lateral femoral condyle with focal partial thickness tear of the medial patellar retinaculum.
- moderate hemorrhagic joint effusion (lipo-haemoarthrosis).
Case Discussion
The triad of bone contusions of the anterior lateral femoral condyle and medial patella as well as partial or complete thickness tear of the medial patellar retinaculum is diagnostic of transient patellar dislocation.
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