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Patellar chondral defect in an 11-year-old skier with no history of trauma or acute injury. A) Axial view of T1 weighted MRI, showing articular cartilage defect of medial patellar facet. B) Intraoperative view showcasing 10 mm wide Outerbridge grade IV focal chondral defect with delamination on the medial patellar facet. C) Chondral defect trimmed to stable border.
