Table 2 Initial stage comments and modifications

Volume Fill of Cartilage Defect

Lack of agreement on the definition of overfilling and the imaging appearance of complete cartilage delamination

Overfilling revised to represent anything over the defect borders and “complete delamination” revised to “complete void”

Integration Into Adjacent Cartilage

Split-like defects should be based on less than or equal to 2 mm

Score modified to define a split-like defect as one that is less than 2 mm

Surface of Repair Tissue

Some concerns regarding the imaging quality and ability to accurately depict surface irregularity using MRI

Size and details of images increased to more clearly demonstrate surface that is intact versus not

Structure of the Repair Tissue

Suggestion to adjust the depiction of heterogeneous repair tissue using closely dotted lines rather than a line

Heterogeneous image adjusted to utilize a closely dotted line for improved visualization

Signal Intensity of Repair Tissue

Would be difficult to evaluate consistently given disparities in MRI technology worldwide

Plan to discuss removal of this section entirely at consensus meeting

Bony Defect

Separate bony defect and bony overgrowth into separate categories and adjust cut off for definition of bony defect

Score adjusted to contain either “no bony defect”, “bony defect less than 2 mm” or “bony defect greater than 2 mm”

Subchondral Changes

Osteonecrosis should be its own category; subchondral cyst should be defined as present or absent and cut off for bone marrow edema should be 25% as opposed to 50%

Score adjusted to include category for osteonecrosis, subchondral cyst defined as present or absent and bone marrow edema cut off changed to 25%