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📌 MRI Findings in Lateral Patellar Dislocation
1️⃣ Osteoarticular Injuries
- After a lateral patellar dislocation, MRI commonly reveals characteristic injuries to osteoarticular structures.
- Typical findings include bone contusions and osteochondral fractures, often located at the medial aspect of the patella and the anterolateral aspect of the lateral femoral condyle. Additionally, intra-articular osteochondral bodies and joint effusion are frequently observed in the acute setting.
- The osseous and osteochondral injuries related to transient lateral patellar dislocation are distinctive enough for accurate diagnosis, even if the patella has reduced.
2️⃣. Lateral Condylar Defects
- In nearly all patients (80%–100%), bone edema of the lateral femoral condyle due to patellar impaction is observed.
- Osteochondral lesions typically affect the anterolateral or mid-lateral aspect of the condyle.
3️⃣. Patellar Defects
- Approximately half of the cases with osteochondral defects show a classic concave impaction deformity of the inferomedial patella, a highly specific sign of prior patellar dislocation.
References
- Radiographics. 2023 Jun;43(6).
- RadioGraphics 2018; 38:2069–2101.
- Skeletal Radiol (2012) 41:137–148.
- RadioGraphics 2010; 30:961–981.
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#MRI, #PatellarDislocation, #BoneContusions, #OsteochondralFractures, #LateralFemoralCondyle, #JointEffusion, #OsteoarticularInjuries, #OsseousInjuries, #PatellarDefects,
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