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Table 1 Histology grading scale (modified from Kirker-Head et al. [16]) used in evaluation of medial femoral condyle cartilage

From: Biological and functional evaluation of a novel pyrolytic carbon implant for the treatment of focal osteochondral defects in the medial femoral condyle: assessment in a canine model

Feature Score
I. Adverse inflammatory response (0–3)
 None
 Slight
 Moderate
 Severe
3
2
1
0
II. Cartilage matrix flow over implant (0–3)
 None
 Slight, one side
 Slight, both sides
 Significant
3
2
1
0
III. Implant-bone apposition (0–3)
 Extensive
 Moderate
 Some
 None
3
2
1
0
IV. Medial femoral condyle cartilage-implant interface (0–3)
 Intact, normal
 Intact, cellular changes
 Moderate disruption
 Severe disruption
3
2
1
0
V. Medial femoral condyle cartilage (0–3)
 Normal
 Some changes, one side
 Some changes, both sides
 Significant degeneration
3
2
1
0
Total score (0–15)