“ This is an osteochondral fracture affecting the articular epiphysis that is thought to be due to a combination of trauma and ischaemia. It...
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This is an osteochondral fracture affecting the articular epiphysis that is thought to be due to a combination of trauma and ischaemia. It is more common in males with a mean age of onset of 15 years. It occurs most commonly in the knee (75% medial femoral condyle), talar dome, tibia, patella and femoral head. It is bilateral in up to 25%.
KNEE X-RAY
• Normal initially or joint effusion
• Flattening and cortical irregularity of the lateral surface of the medial femoral condyles
• Detached loose osteochondral fragment (50%)
KNEE MRI
• Useful to determine stability of the lesion and indication for surgical management
• Four features of instability:
1. High T2 signal between fragment and parent bone2. Cartilaginous defect on T13. High signal in the articular cartilage4. Cystic lesion between fragment and parent bone (needs to be 5 mm or larger)
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