Most are single (72%)
Chondral lesions are very common
Most common site is medial femoral condyle (32%), followed by medial patella (22%)
Most common type is ICRS (International Cartilage Repair Society) type 2 or 3A
Most common type was Grade II (Outerbridge classification) (42%)
Most common associated articular lesions: medial meniscus tear (37%) and ACL injury(36%).
MRI:
Sensitivity 45%
Specificity 100%
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